Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >
Overview
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Tropical Storm Fred made landfall in the Florida panhandle on August 16, 2021. The storm would steadily move inland as it weakened to a tropical depression then a remnant low. The remnants of the storm tracked up the Appalachians from the 17th through the 19th. Fred's remnants continued to produce significant impacts over the Southeast despite it no longer being a tropical storm, mainly in the form of torrential rains and several tornadoes. These impacts would continue into the mid-Atlantic region when the remnants of Fred arrived late on August 18. Initially, impacts associated with Fred were limited through the day on the 18th, as despite good instability building ahead of the system, little convective activity occurred over the eastern mid-Atlantic. However, by the night of the 18th into the predawn hours of the 19th, areal coverage of rain and thunderstorms increased significantly as what was left of Fred's center moved closer and increased lift over the area. With a tropical air mass in place, some areas began to experience several hours of heavy rain, which led to areas of significant flash flooding especially over portions of eastern and southeastern Pennsylvania. A number of water rescues were reported through the nighttime hours. In addition, wind shear increased through the night, causing several thunderstorms to begin rotating. A total of three tornadoes occurred across the local area as Freds' remnants moved through the region, with others over central Pennsylvania. Thankfully, no injuries were reported due to either the flooding or tornadoes. By the morning of the 19th, the system began to move away, and quieter weather returned. |
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Synoptic Overview at 00z 19 Aug 2021 (courtesy of SPC)
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| Figure 1: 250-mb analysis | Figure 2: 300-mb analysis | Figure 3: 500-mb analysis |
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| Figure 4: 700-mb analysis | Figure 5: 850-mb analysis | Figure 6: 925-mb analysis |
Synoptic Overview at 12z 19 Aug 2021 (courtesy of SPC)
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| Figure 7: 250-mb analysis | Figure 8: 300-mb analysis | Figure 9: 500-mb analysis |
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| Figure 10: 700-mb analysis | Figure 11: 850-mb analysis | Figure 12: 925-mb analysis |
Surface Maps (courtesy of WPC)
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| Figure 13: 00z surface map | Figure 14: 03z surface map | Figure 15: 06z surface map |
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| Figure 16: 09z surface map | Figure 17: 12z surface map | Figure 18: 15z surface map |
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| Figure 19: 00z Long Island, NY sounding | Figure 20: 00z Sterling, VA sounding | Figure 21: 00z Wallops Island, VA sounding |
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| Figure 22: 06z Long Island, NY special sounding | Figure 23: 06z Albany, NY special sounding | Figure 24: 12z Long Island, NY sounding |
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| Figure 1: National Preliminary Reports 12z 18 Aug 2021 to 12z 19 Aug 2021 | Figure 2: Zoomed Preliminary Reports for the same period. | Figure 3: Prelim Reports vs. 1630z SPC Convective Outlook |
Click here for a county warning area based plot of local storm reports and warnings/advisories issued for the 18-19 Aug 2021 event.
NWUS51 KPHI 211818
LSRPHI
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
218 PM EDT SAT AUG 21 2021
...SEVERE WEATHER AND FLASH FLOODING REPORTS AUGUST 18-19...
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0632 PM TSTM WND DMG 1 ESE HOMEVILLE 39.85N 75.96W
08/18/2021 CHESTER PA PUBLIC
TWO POLES SNAPPED ALONG ROUTE 896. TIME
ESTIMATED FROM RADAR.
0832 PM TSTM WND DMG 2 SSE HEIDELBERG TWP 40.34N 76.16W
08/18/2021 BERKS PA FIRE DEPT/RESCUE
DELAYED REPORT. SEVERAL DOWNED TREES AND
WIRES IN HEIDELBERG AND SOUTH HEIDELBERG
TOWNSHIPS. TIME ESTIMATED FROM RADAR.
0900 PM TSTM WND DMG 2 SSW HAMBURG 40.52N 76.00W
08/18/2021 BERKS PA EMERGENCY MNGR
DAMAGE TO TREES, POLES, WIRES, AND ROOFS
ALONG FISHER DAM ROAD, ASH ROAD, AND BERNE
ROAD. TIME ESTIMATED FROM RADAR.
0915 PM TORNADO 2 SSW HAMBURG 40.52N 76.00W
08/18/2021 BERKS PA NWS STORM SURVEY
EF1 WITH PEAK WINDS UP TO 95 MPH. THE
TORNADO TOUCHED DOWN ALONG FISHER DAM ROAD
ABOUT 800 FEET NORTH OF THE INTERSECTION
WITH BERNE ROAD. NUMEROUS HARDWOOD TREE
TRUNKS WERE SNAPPED ON THE WESTERN SIDE OF
THE ROAD WITH A CONVERGENT DEBRIS PATTERN. A
CORN FIELD ON THE EAST SIDE OF THE ROAD IN
THE SAME LOCATION WAS DAMAGED WITH STALKS OF
CORN FELLED IN A CONVERGENT PATTERN. FURTHER
NORTH ON FISHER DAM ROAD, HARDWOOD TREE
DAMAGE WAS NOTED, BUT IT WAS MORE SPORADIC.
ADDITIONAL DAMAGE WAS NOTED ABOUT A
HALF-MILE NORTH OF THE INTERSECTION OF BERNE
ROAD AND HILL DRIVE, INCLUDING NUMEROUS
TREES SNAPPED ON THE EAST SIDE OF BERNE
ROAD. A LITTLE FARTHER NORTH, ABOUT 450 FEET
SOUTH OF THE INTERSECTION WITH ASH ROAD, A
UTILITY POLE WAS SNAPPED, AND HARDWOOD TREES
WERE SNAPPED BOTH ON THE WESTERN SIDE AND
THE EASTERN SIDE OF THE ROAD WITH CONVERGENT
DEBRIS PATTERNS NOTED. THERE WAS DAMAGE ON
ASH ROAD, INCLUDING A ROOF THAT WAS REMOVED
FROM A PORCH AND THE ROOF DAMAGE EXTENDED
INTO THE MAIN ROOF OF THE HOUSE. THE ROOF
WAS DEPOSITED TO THE EAST, WHILE AT THE SAME
TIME, A FLAGPOLE FROM THE ROOF SUPPORTS WAS
TOSSED TO THE NORTH. THERE WAS ALSO NUMEROUS
SNAPPED HARDWOOD TREES IN THIS AREA. FURTHER
EAST ON ASH ROAD, ANOTHER HOUSE HAD A LARGE,
HEALTHY TREE SNAPPED. TREE DAMAGE WAS ALSO
NOTED ON PROPERTIES ON THE NORTH SIDE OF ASH
ROAD. FURTHER NORTH OF ASH ROAD, SOME DAMAGE
OCCURRED AT THE VILLAGE OF PLEASANT HILLS
MOBILE HOME COMMUNITY, INCLUDING HARDWOOD
TREES SNAPPED AND SOME CARS WERE DAMAGED BY
THE FALLEN TREES. SOME SKIRTING ALONG THE
BASE OF A MOBILE HOME WAS MOSTLY TORN OFF.
THE DAMAGE APPEARED TO BECOME MORE SPORADIC
AND THEN ENDED.
0933 PM TSTM WND DMG 1 SW MOHNTON 40.27N 76.01W
08/18/2021 BERKS PA FIRE DEPT/RESCUE
DELAYED REPORT. DOWNED TREES AND POWER LINES
NEAR VERMONT ROAD. TIME ESTIMATED FROM
RADAR.
1103 PM HAIL 3 N ROYERSFORD 40.22N 75.53W
08/18/2021 E0.75 INCH MONTGOMERY PA TRAINED SPOTTER
1107 PM HEAVY RAIN NEFFS 40.70N 75.61W
08/18/2021 M2.80 INCH LEHIGH PA TRAINED SPOTTER
WITHIN THE LAST HOUR.
1115 PM FLASH FLOOD 1 NNE LEHIGH VALLEY INT 40.67N 75.43W
08/18/2021 LEHIGH PA 911 CALL CENTER
A PORTION OF WEAVERSVILLE RD WAS CLOSED DUE
TO FLASH FLOODING.
1120 PM FLASH FLOOD LAURYS STATION 40.72N 75.53W
08/18/2021 LEHIGH PA 911 CALL CENTER
A PORTION OF MACARTHUR RD WAS CLOSED DUE TO
FLASH FLOODING.
1120 PM FLASH FLOOD 3 SE SCHNECKSVILLE 40.64N 75.58W
08/18/2021 LEHIGH PA 911 CALL CENTER
COFFEETOWN RD CLOSED DUE TO FLASH FLOODING
IN THE AREA OF OREFIELD RD.
1125 PM TSTM WND DMG 1 SE PLAINFIELD TWP 40.80N 75.26W
08/18/2021 NORTHAMPTON PA FIRE DEPT/RESCUE
DELAYED REPORTS OF A FEW TREES DOWN BETWEEN
NAZARETH AND BANGOR. TIME ESTIMATED FROM
RADAR.
1134 PM HEAVY RAIN EXTON 40.03N 75.63W
08/18/2021 M3.65 INCH CHESTER PA PUBLIC
3 INCHES HAS FALLEN SINCE 10 PM.
1200 AM FLASH FLOOD BANGOR 40.87N 75.21W
08/19/2021 NORTHAMPTON PA 911 CALL CENTER
SOME RESIDENTIAL BASEMENT FLOODING REPORTED
IN BANGOR.
1200 AM FLASH FLOOD 2 SE LEHIGH VALLEY INTE 40.64N 75.42W
08/19/2021 LEHIGH PA 911 CALL CENTER
A PORTION OF PINEHURST RD WAS CLOSED DUE TO
FLASH FLOODING.
1200 AM FLASH FLOOD 2 SE LEHIGH VALLEY INTE 40.64N 75.42W
08/19/2021 LEHIGH PA 911 CALL CENTER
A PORTION OF PINEHURST RD IS CLOSED DUE TO
FLOODING.
1201 AM TSTM WND DMG 1 E EAST BRADFORD TWP 39.96N 75.62W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. DOWNED TREES IN EAST
BRADFORD TWP NEAR DOWNINGTOWN PIKE. TIME
ESTIMATED FROM RADAR.
1206 AM FLASH FLOOD 1 SW PHOENIXVILLE 40.12N 75.53W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
TWO VEHICLES STRANDED IN FLOOD WATERS NEAR
THE INTERSECTION OF MADISON AVE AND TYLER
AVE.
1208 AM FLASH FLOOD 2 SW EAST WHITELAND TWP 40.03N 75.59W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
WATER RESCUE IN THE AREA OF ROUTE 202 AT
ROUTE 30 BYPASS.
1215 AM TSTM WND DMG 2 ESE WEST WHITELAND TW 40.03N 75.59W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
SEVERAL REPORTS OF TREE AND POWER LINE
DAMAGE IN THE DOWNINGTOWN, WEST CHESTER, AND
EXTON AREAS, WITH SEVERAL ROADS CLOSED. TIME
ESTIMATED FROM RADAR.
1224 AM FLASH FLOOD EXTON 40.03N 75.63W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. SEVERAL VEHICLES STUCK ON
LINCOLN HIGHWAY NEAR POTTSTOWN PIKE FROM
WATER AND DEBRIS. TIME BASED ON DISPATCH
REPORT.
1225 AM TSTM WND DMG 2 WNW CHESTERBROOK 40.08N 75.50W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. SEVERAL REPORTS OF TREES
DOWN BETWEEN MALVERN AND PHOENIXVILLE. TIME
ESTIMATED FROM RADAR.
1225 AM TORNADO 1 WNW HATFIELD 40.28N 75.32W
08/19/2021 MONTGOMERY PA NWS STORM SURVEY
EF1 WITH ESTIMATED PEAK WINDS UP TO 105 MPH.
A LINE OF THUNDERSTORMS MOVED ACROSS
MONTGOMERY AND BUCKS COUNTIES EARLY ON THE
MORNING OF AUGUST 19TH AS THE REMNANTS OF
TROPICAL STORM FRED MOVED ACROSS CENTRAL
PENNSYLVANIA. WHAT STARTED AS A FAIRLY QUIET
DAY FOR OUR CWA QUICKLY BECAME BUSY AS NIGHT
FELL. AS A VELOCITY COUPLET FORMED ACROSS
MONTGOMERY COUNTY, A TORNADO FORMED ROUGHLY
A MILE AND A HALF SOUTH OF SOUDERTON, PA
AROUND 12:25 AM EDT, WHERE IT BROUGHT DOWN A
TREE BRANCH AND TORE SIDING OFF OF A
RESIDENCE ON GARRISON LANE. FROM THERE, THE
TORNADO APPEARS TO HAVE LIFTED BRIEFLY
BEFORE BRINGING DOWN A FEW SMALL TREES AND
BRANCHES ALONG TOWNSHIP LINE ROAD. THE
TORNADO THEN BROUGHT DOWN SEVERAL TREES AND
BRANCHES IN THE HIDDEN SPRINGS MOBILE HOME
COMMUNITY. HERE, SEVERAL TREES WERE BROUGHT
DOWN ON HOMES AND ACROSS ROADWAYS WHILE ALSO
LEADING TO MINOR DAMAGE TO THE ROOFS AND
SIDING OF SEVERAL RESIDENCES IN THE
COMMUNITY. THE TORNADO THEN PROCEEDED
NORTHEASTWARD INTO HILLTOWN TOWNSHIP IN
BUCKS COUNTY AS IT BROUGHT DOWN NUMEROUS
TREES IN A TRAJECTORY TOWARDS SILVERDALE.
SEVERAL TREES ALONG THIS LINE WERE ALSO
BROUGHT DOWN. A METAL ROOF WAS EVEN TORN OFF
OF A GARAGE ALONG GREEN STREET IN
SILVERDALE. SEVERAL LARGE BRANCHES WERE THEN
BROUGHT DOWN, DAMAGING A ROOF TO A FARMHOUSE
ALONG SOUDERTON ROAD. THE TORNADO CONTINUED
ITS PATH NORTHEAST, BRINGING DOWN SMALL
TREES AND SNAPPING THE TOPS OF SEVERAL PINE
TREES AT RESIDENCES ALONG WOODLAWN DRIVE AND
BLUE SCHOOL ROAD. LASTLY, THE TORNADO BEGAN
TO LIFT AS IT NEARED THE OPPOSITE END OF
HILLTOWN TOWNSHIP, BUT NOT BEFORE IT RIPPED
A SECTION OF ROOFING OFF AN AUTO REPAIR SHOP
ALONG NORTH DUBLIN PIKE AT THE INTERSECTION
OF BLUE SCHOOL ROAD.
1227 AM FLASH FLOOD WEST CHESTER 39.96N 75.60W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
WATER RESCUE NEAR THE INTERSECTION OF
MONTGOMERY AVE AND E GAY ST.
1227 AM TSTM WND DMG 1 ESE SOUDERTON 40.31N 75.30W
08/19/2021 MONTGOMERY PA EMERGENCY MNGR
DOWNED TREES AND WIRES AND SOME DAMAGE TO
HOMES IN THE AREA OF DEERFIELD DRIVE AND
TOWNSHIP LINE ROAD. TIME ESTIMATED FROM
RADAR. POSSIBLE TORNADO DAMAGE.
1230 AM FLASH FLOOD 2 SE ANALOMINK 41.03N 75.19W
08/19/2021 MONROE PA DEPT OF HIGHWAYS
DELAYED REPORT. FLASH FLOODING CLOSED ROUTE
447 EAST OF ROUTE 191. TIME ESTIMATED FROM
RADAR.
1233 AM TSTM WND DMG 1 E PERKASIE 40.37N 75.29W
08/19/2021 BUCKS PA FIRE DEPT/RESCUE
WIRES DOWN NEAR PERKASIE. LIKELY TORNADO
DAMAGE. TIME BASED ON RADAR AND APPARENT
TORNADO DEBRIS SIGNATURE.
1238 AM FLASH FLOOD WEST CHESTER 39.96N 75.59W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF UNION STREET AND BOLMAR
STREET. TIME BASED ON DISPATCH REPORT.
1240 AM TSTM WND DMG 1 WSW NORTH WALES 40.20N 75.30W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
DELAYED REPORT. LARGE TREE DOWN NEAR THE
INTERSECTION OF 2ND STREET AND OAK STREET.
TIME BASED ON DISPATCH REPORT.
1242 AM FLASH FLOOD 1 N PAOLI 40.06N 75.49W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
WATER RESCUE NEAR THE INTERSECTION OF N
VALLEY RD AND ROUTE 202.
1255 AM FLASH FLOOD 1 SW EAST WHITELAND TWP 40.04N 75.57W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
SEVERAL ROADS FLOODED IN THE AREA INCLUDING
PLANEBROOK, VALLEY, BACTON HILL, AND ROUTE
401.
0100 AM HEAVY RAIN WEST CONSHOHOCKEN 40.07N 75.31W
08/19/2021 M3.23 INCH MONTGOMERY PA TRAINED SPOTTER
STORM TOTAL.
0100 AM HEAVY RAIN TATAMY 40.74N 75.25W
08/19/2021 M3.99 INCH NORTHAMPTON PA TRAINED SPOTTER
0100 AM FLASH FLOOD 1 ESE WEST WHITELAND TW 40.03N 75.61W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. ROCKS AND DEBRIS COVERING
COCKERHAM LANE FROM FLOODING. TIME BASED ON
NEARBY REPORTS.
0100 AM FLASH FLOOD 2 NW EMMAUS 40.56N 75.52W
08/19/2021 LEHIGH PA DEPT OF HIGHWAYS
FLOODING AND ROAD CLOSURES ON MINESITE RD
NEAR SCHANTZ RD. TIME ESTIMATED.
0100 AM HEAVY RAIN KING OF PRUSSIA 40.09N 75.39W
08/19/2021 M3.82 INCH MONTGOMERY PA TRAINED SPOTTER
STORM TOTAL.
0102 AM FLASH FLOOD 1 W KING OF PRUSSIA 40.09N 75.41W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
WATER RESCUE ON N GULF RD.
0106 AM FLASH FLOOD 2 E BERWYN 40.05N 75.41W
08/19/2021 DELAWARE PA FIRE DEPT/RESCUE
WATER RESCUE IN THE AREA OF SUGARTOWN RD AT
MORRIS RD.
0110 AM FLASH FLOOD PAOLI 40.04N 75.48W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
WATER RESCUE NEAR THE INTERSECTION OF
LEOPARD RD AND LANCASETER AVE.
0114 AM FLASH FLOOD ROYERSFORD 40.18N 75.54W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
WATER RESCUE ON 1ST AVE.
0115 AM FLASH FLOOD 1 NE WAYNE 40.05N 75.36W
08/19/2021 DELAWARE PA PUBLIC
SIGNIFICANT STREET FLOODING AND MULTIPLE
REPORTS OF VEHICLES IN FLOOD WATERS. TIME
ESTIMATED.
0119 AM TSTM WND DMG FORT WASHINGTON 40.15N 75.20W
08/19/2021 MONTGOMERY PA DEPT OF HIGHWAYS
DELAYED REPORT. DOWNED TREE CLOSED ROUTE 309
NEAR HIGHLAND AVENUE. TIME ESTIMATED FROM
RADAR.
0120 AM FLASH FLOOD 1 SE MALVERN 40.03N 75.50W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF PAOLI PIKE AND RUSTIC LANE.
TIME BASED ON DISPATCH REPORT.
0125 AM FLASH FLOOD 2 SW KING OF PRUSSIA 40.07N 75.41W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF OLD EAGLE SCHOOL ROAD AND
WALLACE DRIVE. TIME BASED ON DISPATCH
REPORT.
0126 AM FLASH FLOOD BRIDGEPORT 40.10N 75.35W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
WATER RESCUE ON DEKALB ST.
0128 AM FLASH FLOOD 2 E BERWYN 40.05N 75.41W
08/19/2021 DELAWARE PA FIRE DEPT/RESCUE
DELAYED REPORT OF WATER RESCUE ON OLD EAGLE
SCHOOL ROAD AND COUNTY LINE ROAD. TIME BASED
ON DISPATCH REPORT.
0130 AM FLASH FLOOD 1 N BRIDGEPORT 40.11N 75.34W
08/19/2021 MONTGOMERY PA DEPT OF HIGHWAYS
PORTION OF ROUTE 202 FLOODED AND CLOSED.
0130 AM FLASH FLOOD 2 E BERWYN 40.05N 75.41W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
ROCKSLIDE ON STRAFFORD AVENUE NEAR LANCASTER
AVENUE WITH SEVERAL VEHICLES STUCK AND
DAMAGED. TIME ESTIMATED BASED ON NEARBY
REPORTS.
0130 AM FLASH FLOOD 2 SW EAST WHITELAND TWP 40.03N 75.59W
08/19/2021 CHESTER PA DEPT OF HIGHWAYS
ROUTE 202 CLOSED IN THE AREA OF ROUTE 30.
0141 AM FLASH FLOOD 3 SSE EAST NANTMEAL TWP 40.08N 75.71W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE ON PENNSYLVANIA
TURNPIKE NEAR LITTLE CONESTOGA ROAD. TIME
BASED ON DISPATCH REPORT.
0143 AM TSTM WND DMG JENKINTOWN 40.10N 75.12W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
DELAYED REPORT. LARGE TREE DOWN NEAR THE
INTERSECTION OF NEWBOLD ROAD AND CLEMENT
ROAD. TIME ESTIMATED FROM RADAR.
0146 AM FLASH FLOOD 1 ENE PAOLI 40.04N 75.47W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
WATER RESCUE IN THE AREA OF MAPLE AVE AT
AGNEW RD.
0148 AM FLASH FLOOD 1 SSE FLOURTOWN 40.10N 75.20W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
WATER RESCUE IN THE AREA OF PAPER MILL RD AT
HARSTON LN.
0205 AM FLASH FLOOD WEST CHESTER 39.96N 75.60W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF UNION STREET AND FRANKLIN
STREET. TIME BASED ON DISPATCH REPORT.
0209 AM FLASH FLOOD ABINGTON 40.12N 75.12W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
WATER RESCUE ON HIGHLAND AVE.
0211 AM FLASH FLOOD 1 NNW ABINGTON 40.13N 75.13W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF EASTON ROAD AND WOODLAND
ROAD. TIME BASED ON DISPATCH REPORT.
0212 AM FLASH FLOOD 2 W KING OF PRUSSIA 40.09N 75.42W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSTATE 76 AND U.S. HIGHWAY 422
INTERCHANGE. TIME BASED ON DISPATCH REPORT.
0213 AM FLASH FLOOD WEST CONSHOHOCKEN 40.07N 75.31W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF ELM STREET AND MAPLE STREET.
TIME BASED ON DISPATCH REPORT.
0214 AM FLASH FLOOD CHESTERBROOK 40.08N 75.46W
08/19/2021 CHESTER PA OTHER FEDERAL
THE GAUGE ON VALLEY CREEK NEAR VALLEY FORGE
REACHED MODERATE FLOOD STAGE OF 12.61 FEET.
0223 AM FLASH FLOOD 1 SW CHESTERBROOK 40.07N 75.47W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF DUPORTAIL ROAD AND MILL
ROAD. TIME BASED ON DISPATCH REPORT.
0230 AM FLASH FLOOD 1 E LOWER MORELAND TWP 40.12N 75.04W
08/19/2021 MONTGOMERY PA PUBLIC
DELAYED REPORT OF FLOODING ON PHILMONT
AVENUE, FORCING ITS CLOSURE NEAR PINE ROAD.
TIME BASED ON NEARBY REPORTS.
0230 AM FLASH FLOOD 1 ENE HORSHAM TWP 40.21N 75.16W
08/19/2021 MONTGOMERY PA PUBLIC
DELAYED REPORT. FLOODING CLOSED KEITH VALLEY
ROAD BETWEEN COUNTY LINE ROAD AND HORSHAM
ROAD. TIME BASED ON NEARBY REPORTS.
0236 AM TSTM WND DMG 1 NW ROCKAWAY 40.91N 74.52W
08/19/2021 MORRIS NJ TRAINED SPOTTER
LARGE TREE SNAPPED ON MOUNT HOPE RD. TIME
ESTIMATED FROM RADAR.
0238 AM TORNADO 1 W ROCKAWAY 40.90N 74.53W
08/19/2021 MORRIS NJ NWS STORM SURVEY
EF0 WITH ESTIMATED PEAK WINDS UP TO 85 MPH.
ANOTHER VELOCITY COUPLET FORMED IN MORRIS
COUNTY EARLY IN THE MORNING OF AUGUST 19TH
IN ASSOCIATION WITH THUNDERSTORMS AS THE
REMNANTS OF TROPICAL STORM FRED MOVED ACROSS
THE REGION. A WEAK TORNADO FORMED FROM THIS
COUPLET, FIRST TOUCHING DOWN ALONG MOUNT
PLEASANT AVENUE AND IRWIN PLACE IN ROCKAWAY
TOWNSHIP, NEW JERSEY, WHERE SEVERAL SMALL
BRANCHES AND A PORTION OF A VINYL FENCE WERE
BROUGHT DOWN. FROM THERE, THE TORNADO MOVED
THROUGH A SUBDIVISION, BRINGING DOWN SEVERAL
SMALL PINE TREES AND BRANCHES ALONG LENOX
ROAD, ARLENE DRIVE, AND MILLER AVENUE. A FEW
SMALL BRANCHES WERE THEN BROUGHT DOWN AS THE
TORNADO PROCEEDED NORTHEAST ACROSS FLEETWOOD
DRIVE. THE TORNADO THEN CROSSED INTERSTATE
80, SNAPPING SEVERAL TREES ALONG RESERVOIR
AND KATHERINE ROAD. A FEW LARGE BRANCHES
WERE ALSO KNOCKED DOWN IN THIS AREA AS THE
TORNADO LIFTED.
0240 AM TSTM WND DMG 1 NW ROCKAWAY 40.91N 74.53W
08/19/2021 MORRIS NJ TRAINED SPOTTER
PHOTOS OF SEVERAL TREES DOWN IN ROADWAYS AND
IN POWER LINES ALONG KATHERINE AND RESERVOIR
ROADS. DAMAGE MAY BE TORNADIC BASED ON RADAR
SIGNATURES. TIME ESTIMATED FROM RADAR.
0245 AM FLASH FLOOD CHELTENHAM 40.06N 75.10W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
WATER RESCUE ON ASHMEADE RD.
0245 AM FLASH FLOOD 1 SE MANAYUNK 40.02N 75.21W
08/19/2021 PHILADELPHIA PA OTHER FEDERAL
THE GAUGE ON THE WISSAHICKON CREEK NEAR
WISSAHICKON CRESTED AT MINOR FLOOD STAGE OF
6.30 FEET.
0245 AM FLASH FLOOD 1 S PENN WYNNE 39.98N 75.28W
08/19/2021 DELAWARE PA OTHER FEDERAL
COBBS CREEK CRESTED AT MODERATE FLOOD STAGE
OF 8.35 FT.
0247 AM FLOOD JENKINTOWN 40.10N 75.13W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
DELAYED REPORT. FLOODING ON SHOEMAKER AVENUE
AND CEDAR STREET. TIME BASED ON DISPATCH
REPORT.
0251 AM FLASH FLOOD 1 SSW SUMMERDALE 40.02N 75.10W
08/19/2021 PHILADELPHIA PA OTHER FEDERAL
FRANKFORD CREEK CRESTED AT MODERATE FLOOD
STAGE OF 9.62 FT.
0251 AM FLASH FLOOD 1 NNW HOLMESBURG 40.05N 75.03W
08/19/2021 PHILADELPHIA PA OTHER FEDERAL
THE PENNYPACK CREEK REACHED MINOR FLOOD
STAGE WITH A CREST OF 7.58 FT.
0255 AM FLASH FLOOD 1 SSE ABINGTON 40.11N 75.12W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
WATER RESCUE ON BROOK RD.
0300 AM HEAVY RAIN 2 NNE ARLINGTON HEIGHTS 41.01N 75.21W
08/19/2021 M3.90 INCH MONROE PA CO-OP OBSERVER
STORM TOTAL.
0317 AM FLASH FLOOD VALLEY FORGE 40.10N 75.46W
08/19/2021 MONTGOMERY PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE ON RIVER ROAD.
TIME BASED ON DISPATCH REPORT.
0319 AM HEAVY RAIN WYNNEWOOD 40.00N 75.27W
08/19/2021 M3.73 INCH MONTGOMERY PA TRAINED SPOTTER
STORM TOTAL.
0326 AM FLASH FLOOD 1 SW SHAWMONT 40.04N 75.25W
08/19/2021 MONTGOMERY PA DEPT OF HIGHWAYS
DELAYED REPORT. WATER RESCUE ON THE RAMP TO
SCHUYLKILL EXPRESSWAY VIA HOLLOW ROAD. TIME
BASED ON DISPATCH REPORT.
0342 AM FLASH FLOOD 2 S PAOLI 40.01N 75.48W
08/19/2021 CHESTER PA FIRE DEPT/RESCUE
DELAYED REPORT. WATER RESCUE NEAR THE
INTERSECTION OF DAVIS ROAD AND GRUBB ROAD.
TIME BASED ON DISPATCH REPORT.
&&
$$
CMS/JO/SJ/TD/MG
NOUS41 KPHI 201814 CCA PNSPHI DEZ001>004-MDZ012-015-019-020-NJZ001-007>010-012>027-PAZ054-055- 060>062-070-071-101>106-210600- Public Information Statement...CORRECTED National Weather Service Mount Holly NJ 214 PM EDT Fri Aug 20 2021 ...Three Confirmed Tornadoes... The National Weather Service office in Mount Holly, NJ surveyed three areas of damage across Pennsylvania and New Jersey on August 19th. This was in association with thunderstorms that moved across the region during night of August 18th and the early morning hours of August 19th. These were with the remnants of Tropical Storm Fred as it moved across the region. .Tilden Twp PA Tornado... Rating: EF-1 Estimated Peak Wind: 95 mph Path Length /statute/: 1.10 miles Path Width /maximum/: 125 yards Fatalities: 0 Injuries: 0 Start Date: August 18, 2021 Start Time: 9:15 PM EDT Start Location: Tilden Twp / Berks / PA Start Lat/Lon: 40.525/-76.001 End Date: August 18, 2021 End Time: 9:18 PM EDT End Location: Tilden Twp / Berks / PA End Lat/Lon: 40.540/-76.996 The tornado touched down along Fisher Dam Road about 800 feet north of the intersection with Berne Road. Numerous hardwood tree trunks were snapped on the western side of the road with a convergent debris pattern. A corn field on the east side of the road in the same location was damaged with stalks of corn felled in a convergent pattern. Further north on Fisher Dam Road, hardwood tree damage was noted, but it was more sporadic. Additional damage was noted about a half-mile north of the intersection of Berne Road and Hill Drive, including numerous trees snapped on the east side of Berne Road. A little farther north, about 450 feet south of the intersection with Ash Road, a utility pole was snapped, and hardwood trees were snapped both on the western side and the eastern side of the road with convergent debris patterns noted. There was damage on Ash Road, including a roof that was removed from a porch and the roof damage extended into the main roof of the house. The roof was deposited to the east, while at the same time, a flagpole from the roof supports was tossed to the north. There was also numerous snapped hardwood trees in this area. Further east on Ash Road, another house had a large, healthy tree snapped. Tree damage was also noted on properties on the north side of Ash Road. Further north of Ash Road, some damage occurred at the Village of Pleasant Hills Mobile Home community, including hardwood trees snapped and some cars were damaged by the fallen trees. Some skirting along the base of a mobile home was mostly torn off. The damage appeared to become more sporadic and then ended. The National Weather Service would like to thank Mr. Lou Ruh for his extensive assistance with this survey, and also thanks to the Pennsylvania Emergency Management Agency for providing locations of the damage. .Hatfield Twp-Hilltown Twp, PA Tornado... Rating: EF-1 Estimated Peak Wind: 105 mph Path Length /statute/: 8.77 miles Path Width /maximum/: 140 yards Fatalities: 0 Injuries: 0 Start Date: August 19, 2021 Start Time: 12:25 AM EDT Start Location: Hatfield Twp / Montgomery / PA Start Lat/Lon: 40.284/-75.322 End Date: August 19, 2021 End Time: 12:40 AM EDT End Location: Hilltown Twp / Bucks / PA End Lat/Lon: 40.392/-75.235 A line of thunderstorms moved across Montgomery and Bucks Counties early on the morning of August 19th as the remnants of Tropical Storm Fred moved across central Pennsylvania. What started as a fairly quiet day for our CWA quickly became busy as night fell. As a velocity couplet formed across Montgomery County, a tornado formed roughly a mile and a half south of Souderton, PA around 12:25 AM EDT, where it brought down a tree branch and tore siding off of a residence on Garrison Lane. From there, the tornado appears to have lifted briefly before bringing down a few small trees and branches along Township Line Road. The tornado then brought down several trees and branches in the Hidden Springs mobile home community. Here, several trees were brought down on homes and across roadways while also leading to minor damage to the roofs and siding of several residences in the community. The tornado then proceeded northeastward into Hilltown Township in Bucks County as it brought down numerous trees in a trajectory towards Silverdale. Several trees along this line were also brought down. A metal roof was even torn off of a garage along Green Street in Silverdale. Several large branches were then brought down, damaging a roof to a farmhouse along Souderton Road. The tornado continued its path northeast, bringing down small trees and snapping the tops of several pine trees at residences along Woodlawn Drive and Blue School Road. Lastly, the tornado began to lift as it neared the opposite end of Hilltown Township, but not before it ripped a section of roofing off an auto repair shop along North Dublin Pike at the intersection of Blue School Road. The National Weather Service would like to thank the Bucks and Montgomery County offices of Emergency Management for their contributions to this survey along with Hilltown Township for assisting our survey crew. .Rockaway Twp, NJ Tornado... Rating: EF-0 Estimated Peak Wind: 85 mph Path Length /statute/: 0.91 miles Path Width /maximum/: 50 yards Fatalities: 0 Injuries: 0 Start Date: August 19, 2021 Start Time: 02:38 AM EDT Start Location: Rockaway / Morris / NJ Start Lat/Lon: 40.902/-74.533 End Date: August 19, 2021 End Time: 02:40 AM EDT End Location: Rockaway / Morris / NJ End Lat/Lon: 40.913/-75.525 Another velocity couplet formed in Morris County early in the morning of August 19th in association with thunderstorms as the remnants of Tropical storm Fred moved across the region. A weak tornado formed from this couplet, first touching down along Mount Pleasant Avenue and Irwin Place in Rockaway Township, New Jersey, where several small branches and a portion of a vinyl fence were brought down. From there, the tornado moved through a subdivision, bringing down several small pine trees and branches along Lenox Road, Arlene Drive, and Miller Avenue. A few small branches were then brought down as the tornado proceeded northeast across Fleetwood Drive. The tornado then crossed Interstate 80, snapping several trees along Reservoir and Katherine Road. A few large branches were also knocked down in this area as the tornado lifted. $$ Corrected the End Time for the Rockaway Twp tornado. Davis/Gorse/Staarmann
NOUS41 KPHI 191459 PNSPHI DEZ001>004-MDZ012-015-019-020-NJZ001-007>010-012>027-PAZ054-055-060>062-070- 071-101>106-200259- Public Information Statement National Weather Service Mount Holly NJ 1059 AM EDT Thu Aug 19 2021 ...RAINFALL REPORTS... Location Amount Time/Date Provider ...New Jersey... ...Hunterdon County... Flemington 0.3 E 1.75 in 0630 AM 08/19 COCORAHS Holland Twp 2.6 NNE 1.71 in 0550 AM 08/19 COCORAHS Bloomsbury 1.55 in 1039 AM 08/19 CWOP Raritan Twp 2.4 N 1.54 in 0700 AM 08/19 COCORAHS Stockton 1.31 in 1035 AM 08/19 CWOP Teetertown 1.21 in 1010 AM 08/19 RAWS Milford 1.17 in 1039 AM 08/19 CWOP Flemington 3 E 1.04 in 0745 AM 08/19 COOP Bethlehem Twp 0.6 S 1.02 in 0700 AM 08/19 COCORAHS Flemington 1.9 SE 1.00 in 0600 AM 08/19 COCORAHS Clinton Twp. 4 N 1.00 in 0800 AM 08/19 COCORAHS ...Mercer County... Ewing 2.11 in 1030 AM 08/19 CWOP Ewing Twp 1.6 SE 2.10 in 0710 AM 08/19 COCORAHS Lawrence Twp. 1.8 SSW 1.82 in 0700 AM 08/19 COCORAHS 1.3 E Ewing 1.59 in 1030 AM 08/19 HADS Mercerville 1.49 in 1035 AM 08/19 CWOP Hamilton 1.43 in 1035 AM 08/19 CWOP Ewing Twp. 1.29 in 0705 AM 08/19 COCORAHS 1.9 NE Windsor 1.18 in 0700 AM 08/19 COOP West Windsor Twp 2.6 N 1.18 in 0714 AM 08/19 COCORAHS Hamilton Twp 2.3 NE 1.14 in 0700 AM 08/19 COCORAHS Lawrence Township 1.11 in 1030 AM 08/19 CWOP ...Middlesex County... Plainsboro Twp 1.8 ESE 1.17 in 0700 AM 08/19 COCORAHS ...Morris County... Mine Hill Twp. 1.63 in 0800 AM 08/19 COCORAHS Roxbury Twp. 1.62 in 0800 AM 08/19 COCORAHS Mine Hill 1.48 in 1030 AM 08/19 CWOP Rockaway 1.47 in 0800 AM 08/19 COCORAHS Boonton NW 1.42 in 0700 AM 08/19 COCORAHS Montville 1.41 in 1036 AM 08/19 CWOP Whippany 1.39 in 1036 AM 08/19 CWOP Montville Twp 0.4 E 1.26 in 0830 AM 08/19 COCORAHS 1.4 NW Florham Park 1.24 in 0945 AM 08/19 IFLOWS Denville Twp 0.8 N 1.23 in 0800 AM 08/19 COCORAHS Picatinny Lake 1.23 in 1030 AM 08/19 HADS Boonton 0.7 WSW 1.22 in 0700 AM 08/19 COCORAHS Randolph Twp. 2 E 1.21 in 0800 AM 08/19 COCORAHS Pompton Plains 1.20 in 1040 AM 08/19 CWOP Denville 1.19 in 0922 AM 08/19 CWOP 2.1 NE Long Valley 1.19 in 1030 AM 08/19 HADS Ironia 1.16 in 0945 AM 08/19 HADS Randolph Twp 2.2 SW 1.15 in 0700 AM 08/19 COCORAHS 0.9 SE Boonton 1.15 in 0700 AM 08/19 COOP Denville Twp 1.5 ESE 1.14 in 0700 AM 08/19 COCORAHS Morristown 0.7 WNW 1.12 in 0700 AM 08/19 COCORAHS 2.2 SW Denville 1.12 in 0945 AM 08/19 IFLOWS Lincoln Park 1.09 in 1015 AM 08/19 HADS Randolph 1.05 in 1040 AM 08/19 CWOP West Wharton 1.04 in 0945 AM 08/19 IFLOWS Morris Twp. 1.02 in 0600 AM 08/19 COCORAHS Harding Twp 2.4 W 1.02 in 0700 AM 08/19 COCORAHS ...Somerset County... 1.4 N Far Hills 1.36 in 1045 AM 08/19 IFLOWS Bedminster Twp. 2.9 ESE 1.31 in 0600 AM 08/19 COCORAHS 1.8 SE Pottersville 1.19 in 1030 AM 08/19 IFLOWS Peapack-Gladstone 1.2 NW 1.10 in 0739 AM 08/19 COCORAHS Bridgewater 1.08 in 1035 AM 08/19 CWOP ...Sussex County... Newton 7.2 W 2.26 in 0700 AM 08/19 COCORAHS Blue Mountain Lakes 2.21 in 1014 AM 08/19 RAWS Vernon Twp 2.7 SSE 2.04 in 0555 AM 08/19 COCORAHS Highland Lakes 1 SW 2.04 in 0600 AM 08/19 COOP Branchville 1.96 in 1036 AM 08/19 CWOP Hardyston Twp 3.2 SE 1.81 in 0730 AM 08/19 COCORAHS Fredon Twp 2.4 NE 1.61 in 0700 AM 08/19 COCORAHS Andover 1.60 in 0954 AM 08/19 ASOS Montague 1.57 in 1035 AM 08/19 CWOP Spart 1.47 in 1030 AM 08/19 CWOP 2.1 E Barry Lakes 1.44 in 0945 AM 08/19 HADS Branchville 4.3 ENE 1.40 in 0700 AM 08/19 COCORAHS Andover Twp 1.7 W 1.39 in 0700 AM 08/19 COCORAHS Montague Twp 2.7 WNW 1.38 in 0700 AM 08/19 COCORAHS Sparta Twp 3.6 SSW 1.25 in 0700 AM 08/19 COCORAHS 2.3 N Stockholm 1.24 in 0945 AM 08/19 HADS 0.7 NE Flatbrookville 1.24 in 1000 AM 08/19 HADS Sparta 1.17 in 1040 AM 08/19 CWOP Vernon Twp 1.7 N 1.15 in 0700 AM 08/19 COCORAHS Wallkill River Nwr 1.11 in 0956 AM 08/19 RAWS Sparta Twp 3.3 NW 1.10 in 0800 AM 08/19 COCORAHS LaFayette 1.10 in 1040 AM 08/19 CWOP Glenwood 1.08 in 1030 AM 08/19 CWOP ...Warren County... Columbia 3.00 in 1030 AM 08/19 CWOP Blairstown Twp 2.3 SW 2.91 in 0700 AM 08/19 COCORAHS 0.5 W Belvidere 2.85 in 0700 AM 08/19 COOP Blairstown Twp 2.4 E 2.77 in 0800 AM 08/19 COCORAHS Blairstown Twp 2.2 ESE 2.64 in 0700 AM 08/19 COCORAHS Knowlton Twp 1.7 S 2.50 in 0855 AM 08/19 COCORAHS Belvidere 2.42 in 1035 AM 08/19 CWOP Phillipsburg 2.18 in 0700 AM 08/19 COOP White Twp 1.7 S 2.04 in 0730 AM 08/19 COCORAHS Phillipsburg 1.7 NNE 1.95 in 0700 AM 08/19 COCORAHS Belvidere 1.81 in 1030 AM 08/19 CWOP Oxford Twp 0.6 SSW 1.80 in 0800 AM 08/19 COCORAHS Greenwich Twp 1.6 S 1.64 in 0700 AM 08/19 COCORAHS Riegelsville 1.50 in 0700 AM 08/19 COOP Washington Twp. 1.8 SE 1.29 in 0700 AM 08/19 COCORAHS Allamuchy 1.05 in 1035 AM 08/19 CWOP ...Pennsylvania... ...Berks County... Mohnton 2.8 SSW 3.32 in 0800 AM 08/19 COCORAHS 3.5 SW Earl Twp 2.39 in 0700 AM 08/19 HADS New Morgan 1.8 WNW 2.29 in 0800 AM 08/19 COCORAHS Reading 2.17 in 1030 AM 08/19 CWOP Reading 3.5 SW 2.09 in 0800 AM 08/19 COCORAHS Sinking Spring 1.98 in 1028 AM 08/19 CWOP Reading 2.3 NW 1.88 in 0700 AM 08/19 COCORAHS 0.6 E West Reading 1.86 in 1000 AM 08/19 HADS Hamburg 1.82 in 0700 AM 08/19 COCORAHS Mertztown 1.75 in 1031 AM 08/19 CWOP Reading 1.47 in 0954 AM 08/19 ASOS 0.5 SW Hamburg 1.46 in 0800 AM 08/19 COOP Harlem 1.44 in 1030 AM 08/19 CWOP West Lawn 1.43 in 1044 AM 08/19 AWS 2.5 N Centerport 1.40 in 1000 AM 08/19 HADS Sinking Spring 1.38 in 1035 AM 08/19 CWOP 1.8 W Bern Twp 1.25 in 0700 AM 08/19 COOP Lenhartsville 1.12 in 1038 AM 08/19 CWOP Bernville 1.3 SW 1.10 in 0700 AM 08/19 COCORAHS Fleetwood 4.8 ESE 1.10 in 0700 AM 08/19 COCORAHS ...Bucks County... Quakertown 2.54 in 1036 AM 08/19 CWOP Sellersville 2.27 in 1035 AM 08/19 CWOP Doylestown 3.4 SW 1.90 in 0800 AM 08/19 COCORAHS Quakertown 1.85 in 1032 AM 08/19 CWOP Doylestown 1.81 in 1043 AM 08/19 ASOS Quakertown 1.9 NNE 1.70 in 0700 AM 08/19 COCORAHS Langhorne 2.8 NE 1.70 in 0700 AM 08/19 COCORAHS Langhorne 1.50 in 1039 AM 08/19 CWOP Southampton 1.49 in 1037 AM 08/19 CWOP Chalfont 1.44 in 1030 AM 08/19 CWOP Holland 1.43 in 1037 AM 08/19 CWOP Kintnersville 1.38 in 1036 AM 08/19 CWOP Perkasie 1.34 in 1040 AM 08/19 CWOP Newtown (George) 1.25 in 1044 AM 08/19 AWS Lahaska 1.23 in 1044 AM 08/19 AWS Langhorne 3.4 NNE 1.21 in 0630 AM 08/19 COCORAHS 1.2 NE Springtown 1.03 in 0700 AM 08/19 COOP ...Carbon County... Jim Thorpe 2.87 in 0700 AM 08/19 COCORAHS Lehighton 3.3 WSW 2.51 in 0700 AM 08/19 COCORAHS Weatherly 2.24 in 1031 AM 08/19 CWOP Palmerton 5.8 ENE 2.13 in 0800 AM 08/19 COCORAHS Lake Harmony 2.03 in 1036 AM 08/19 CWOP 0.9 SW Blakeslee 1.96 in 1015 AM 08/19 HADS Lake Harmony 2.4 WNW 1.95 in 0700 AM 08/19 COCORAHS Lehighton 1.94 in 1036 AM 08/19 CWOP Lehighton 1 SSW 1.64 in 0800 AM 08/19 COOP Beltzville Lake 1.02 in 1030 AM 08/19 HADS ...Chester County... West Chester 5.08 in 1035 AM 08/19 CWOP West Whiteland Twp. 4.94 in 1037 AM 08/19 CWOP Exton 2.1 SE 4.39 in 0849 AM 08/19 COCORAHS Berwyn 4.13 in 1031 AM 08/19 CWOP Exton 3.65 in 1134 PM 08/18 Public Exton 1.5 WNW 3.42 in 0700 AM 08/19 COCORAHS Malvern 3.25 in 1040 AM 08/19 CWOP Downingtown 1.7 NE 3.20 in 0730 AM 08/19 COCORAHS Phoenixville 3.00 in 1030 AM 08/19 CWOP Downingtown 2.92 in 1030 AM 08/19 CWOP West Grove 2.73 in 1036 AM 08/19 CWOP Cochranville 2.70 in 1036 AM 08/19 CWOP Northbrook 2.68 in 0945 AM 08/19 HADS Spring City 2.68 in 1037 AM 08/19 CWOP Phoenixville 2.9 W 2.64 in 0700 AM 08/19 COCORAHS Wickerton 2.55 in 0800 AM 08/19 COCORAHS Coatesville 2.40 in 1031 AM 08/19 CWOP 1 NNW East Caln Twp 2.39 in 1045 AM 08/19 AWS Modena 1.1 NNE 2.32 in 0700 AM 08/19 COCORAHS West Chester 2.27 in 1035 AM 08/19 AWOS West Chester 2.09 in 1031 AM 08/19 CWOP Unionville 2.2 NE 2.05 in 0730 AM 08/19 COCORAHS Glenmoore 1.95 in 1037 AM 08/19 CWOP Ludwigs Corner 1.95 in 1044 AM 08/19 AWS New London 1.91 in 1032 AM 08/19 CWOP West Chester 2 SE 1.86 in 0630 AM 08/19 COCORAHS Coatesville 1.85 in 0800 AM 08/19 COOP West Grove 1.79 in 1039 AM 08/19 CWOP West Grove 2.6 W 1.70 in 0700 AM 08/19 COCORAHS West Chester 1.68 in 1031 AM 08/19 CWOP West Chester 2.4 SSE 1.60 in 0700 AM 08/19 COCORAHS Oxford 1.59 in 1030 AM 08/19 CWOP West Chester 1.59 in 1033 AM 08/19 CWOP Westtown 1.57 in 1022 AM 08/19 CWOP West Chester 1.7 E 1.54 in 0730 AM 08/19 COCORAHS Pottstown 1.38 in 1031 AM 08/19 CWOP Pottstown 1.33 in 1032 AM 08/19 CWOP Atglen 0.2 W 1.24 in 0600 AM 08/19 COCORAHS Atglen 1.23 in 1037 AM 08/19 CWOP Westtown 1.22 in 1029 AM 08/19 CWOP Downingtown 1.18 in 0945 AM 08/19 HADS West Branch Brandywine CRK M 1.18 in 1040 AM 08/19 DEOS2 Pughtown 1.18 in 1045 AM 08/19 AWS Chadds Ford 1.17 in 1031 AM 08/19 CWOP 1.2 E Glenmoore 1.10 in 0700 AM 08/19 COOP Valley Forge 1.09 in 1030 AM 08/19 HADS White Clay Creek West Grove- 1.07 in 1040 AM 08/19 DEOS2 Modena 1.02 in 1030 AM 08/19 HADS ...Delaware County... Wayne 3.71 in 0610 AM 08/19 Trained Spotter Wayne (Radnor PW) 2.44 in 1044 AM 08/19 URBANET Wyola 1.98 in 1045 AM 08/19 URBANET Thornton 1.61 in 1037 AM 08/19 CWOP ...Lehigh County... Schnecksville 1.7 ENE 3.85 in 0818 AM 08/19 COCORAHS Trexler 3.67 in 0843 AM 08/19 RAWS Schnecksville 2.7 SW 3.33 in 0700 AM 08/19 COCORAHS Bethlehem 2.5 W 3.19 in 0700 AM 08/19 COCORAHS Lehigh Valley Intl Airport 3.17 in 1046 AM 08/19 ASOS Coplay 0.4 W 3.15 in 0700 AM 08/19 COCORAHS Neffs 2.80 in 1107 PM 08/18 Trained Spotter Whitehall 2.65 in 1040 AM 08/19 CWOP Weisenberg Twp 2.39 in 1040 AM 08/19 AWS Washington Twp 2.32 in 0544 AM 08/19 Trained Spotter Fogelsville 2.32 in 1030 AM 08/19 CWOP Bethlehem 2.24 in 1036 AM 08/19 CWOP Slatington 2.16 in 1030 AM 08/19 HADS Emmaus 2.9 S 2.00 in 0618 AM 08/19 COCORAHS Center Valley 1.96 in 1040 AM 08/19 CWOP Macungie 1.82 in 1040 AM 08/19 CWOP 1 NE Lynn Twp 1.80 in 1040 AM 08/19 AWS Slatington 6.0 WSW 1.52 in 0700 AM 08/19 COCORAHS Germansville 1.46 in 1035 AM 08/19 CWOP Coopersburg 1.29 in 1030 AM 08/19 CWOP ...Monroe County... 2 NNE Arlington Heights 3.90 in 0300 AM 08/19 CO-OP Observer Mount Pocono 0.7 N 3.28 in 0730 AM 08/19 COCORAHS Saylorsburg 3.23 in 1035 AM 08/19 CWOP East Stroudsburg 2.94 in 1040 AM 08/19 CWOP 1 NNW Pocono Summit 2.87 in 0548 AM 08/19 Trained Spotter Mt. Pocono 2.75 in 1004 AM 08/19 ASOS Canadensis 2.66 in 0700 AM 08/19 COOP Saylorsburg 4.0 W 2.61 in 0755 AM 08/19 COCORAHS Stroudsburg 5 W 2.40 in 0800 AM 08/19 COCORAHS Pocono Manor 2.11 in 1031 AM 08/19 CWOP Snydersville 2.08 in 1038 AM 08/19 CWOP Blakeslee 1.92 in 1031 AM 08/19 CWOP Pocono Pines 1.90 in 1030 AM 08/19 CWOP Kresgeville 1.89 in 1030 AM 08/19 HADS Stoddartsville 1.82 in 1015 AM 08/19 HADS ...Montgomery County... King Of Prussia 0.7 NNW 4.20 in 0700 AM 08/19 COCORAHS King of Prussia 3.82 in 0100 AM 08/19 Trained Spotter Wynnewood 3.73 in 0319 AM 08/19 Trained Spotter Pottstown 3.50 in 1034 AM 08/19 ASOS 0.5 NW West Conshohocken 3.48 in 0700 AM 08/19 COOP Limerick 1.1 W 3.31 in 0900 AM 08/19 COCORAHS West Conshohocken 3.23 in 0100 AM 08/19 Trained Spotter Green Lane 0.9 ESE 3.20 in 0800 AM 08/19 COCORAHS Wyncote 3.19 in 0715 AM 08/19 COCORAHS Ardmore 0.5 NW 3.10 in 0800 AM 08/19 COCORAHS Royersford 3.02 in 1039 AM 08/19 CWOP Green Lane 1.7 E 2.94 in 0901 AM 08/19 COCORAHS North Hills 2.89 in 1030 AM 08/19 CWOP Gilbertsville 2.85 in 1040 AM 08/19 CWOP Bala Cynwyd 2.80 in 1038 AM 08/19 CWOP Jenkintown 0.2 SSE 2.76 in 0700 AM 08/19 COCORAHS Schwenksville 2.74 in 1036 AM 08/19 CWOP Glenside 1.1 NW 2.71 in 0630 AM 08/19 COCORAHS Glenside 2.70 in 1039 AM 08/19 CWOP Harleysville 3.9 WNW 2.66 in 0700 AM 08/19 COCORAHS 1.0 E Graterford 2.65 in 0700 AM 08/19 COOP Blue Bell 2.3 NW 2.64 in 0645 AM 08/19 COCORAHS North Wales SW 2.55 in 0700 AM 08/19 COCORAHS Willow Grove 2.54 in 1035 AM 08/19 CWOP Willow Grove 0.9 ESE 2.41 in 0700 AM 08/19 COCORAHS Harleysville 2.9 S 2.40 in 0741 AM 08/19 COCORAHS Plymouth Meeting 2.1 NW 2.39 in 0638 AM 08/19 COCORAHS Eagleville 2.36 in 0140 AM 08/19 Trained Spotter Fort Washington 2.36 in 1035 AM 08/19 CWOP Graterford 2.30 in 1044 AM 08/19 AWS Fort Washington 0.8 NW 2.26 in 0800 AM 08/19 COCORAHS Ambler 0.7 W 2.22 in 0704 AM 08/19 COCORAHS Eagleville 2.16 in 0920 AM 08/19 CWOP Pennsburg 0.5 E 2.15 in 0800 AM 08/19 COCORAHS Ambler 2.13 in 1027 AM 08/19 CWOP Philly Wings Field 2.12 in 1035 AM 08/19 AWOS North Wales 0.4 S 2.11 in 0655 AM 08/19 COCORAHS Ambler 0.4 NE 2.05 in 0800 AM 08/19 COCORAHS North Wales 2.05 in 0800 AM 08/19 COCORAHS Hatfield 2 WSW 1.97 in 0800 AM 08/19 COCORAHS Willow Grove 1.97 in 1030 AM 08/19 CWOP Skippack 2.6 ESE 1.94 in 0700 AM 08/19 COCORAHS Pennsburg 1.6 SSW 1.86 in 0730 AM 08/19 COCORAHS Lansdale 3.9 SW 1.83 in 0630 AM 08/19 COCORAHS Lansdale 3 SW 1.82 in 0900 AM 08/19 COCORAHS Royersford (ES) 1.81 in 1044 AM 08/19 AWS North Wales 1.3 WSW 1.79 in 0700 AM 08/19 COCORAHS East Norriton 1.79 in 1038 AM 08/19 CWOP Fort Washington (ES) 1.78 in 1044 AM 08/19 URBANET Blue Bell 1.74 in 1030 AM 08/19 CWOP Red Hill 2.7 SW 1.73 in 0700 AM 08/19 COCORAHS East Greenville 0.4 SSW 1.71 in 0730 AM 08/19 COCORAHS 1 NW Conshohocken 1.70 in 1005 AM 08/19 AWS East Greenville 0.5 WSW 1.65 in 0800 AM 08/19 COCORAHS Worcester 1.62 in 1040 AM 08/19 CWOP Pennsburg 2.4 SSW 1.61 in 0700 AM 08/19 COCORAHS Graterford 1.60 in 1015 AM 08/19 HADS Fort Washington 1.54 in 1045 AM 08/19 AWS Hatfield 0.1 SSW 1.47 in 0600 AM 08/19 COCORAHS Lansdale 0.1 S 1.46 in 0700 AM 08/19 COCORAHS Perkiomenville 1.28 in 1031 AM 08/19 CWOP Oaks (ES) 1.22 in 1044 AM 08/19 URBANET Hatboro 0.6 E 1.09 in 0600 AM 08/19 COCORAHS ...Northampton County... Tatamy 4.79 in 0700 AM 08/19 COCORAHS Plainfield Twp 4.74 in 1015 AM 08/19 Trained Spotter Tatamy 3.99 in 0100 AM 08/19 Trained Spotter Nazareth 1 W 3.64 in 0700 AM 08/19 COCORAHS Portland 2.7 WNW 3.38 in 0700 AM 08/19 COCORAHS Easton 4.2 W 3.21 in 0700 AM 08/19 COCORAHS Bethlehem 1.8 NW 3.16 in 0800 AM 08/19 COCORAHS Bethlehem 2.3 NW 2.86 in 0758 AM 08/19 COCORAHS Martins Creek 2.83 in 1031 AM 08/19 CWOP Northampton (MS) 2.73 in 1045 AM 08/19 AWS Martins Creek 2.54 in 0700 AM 08/19 COCORAHS Mount Bethel 2.4 SE 2.54 in 0700 AM 08/19 COCORAHS Nazareth 2.33 in 1030 AM 08/19 CWOP Walnutport 2.25 in 1033 AM 08/19 CWOP Bethlehem 2.10 in 1039 AM 08/19 CWOP Easton 1.92 in 1035 AM 08/19 CWOP Palmer Township 1.91 in 1035 AM 08/19 CWOP ...Philadelphia County... Rockledge SE 1.93 in 0600 AM 08/19 COCORAHS Philadelphia 4.7 NE 1.85 in 0540 AM 08/19 COCORAHS Philadelphia Northeast 1.61 in 0954 AM 08/19 ASOS Philadelphia 2.1 NE 1.28 in 0800 AM 08/19 COCORAHS Philadelphia 1.25 in 1040 AM 08/19 CWOP 1 SE Northeast Philadelphia 1.25 in 1040 AM 08/19 AWS &&
Notable Radar Imagery (GR2Analyst)
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| Figure 1: KDIX radar reflectivity factor (left) and storm relative motion (SRM, right) for the 0.5 degree elevation angle valid 0105 to 0118 UTC 19 August 2021. At this time, an EF1 tornado touched down in Tilden Twp in northwest Berks County, snapping numerous trees and damaging several homes. A small red marker is placed at the approximate touchdown location. Evaluating the radar data, there is virtually no sign of rotation or anything else remarkable in association with this storm. In this location, at its lowest beam angle, the KDIX radar, while the closest available, was scanning at an elevation of nearly 9000 feet, too high to see what was likely a brief and shallow tornadic circulation. In short, this tornado was not detectable via the existing radar network. | Figure 2: Same as Figure 1 valid 0420 to 0442 UTC 19 August 2021. The second tornado of the night touched down in Hatfield Twp in Montgomery County. This strong EF1 tornado would by far be the longest tracked of the event, cutting a nearly 9 mile path from Hatfield to Hilltown Twp in Bucks County, with some of the worst damaging occurring near Perkasie. In this case, rotation is evident on radar, though it still is not especially strong evidence of a true tornadic couplet from the KDIX radar. In this case, the radar was scanning at a height of around 4000 feet. |
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| Figure 3: KDIX storm relative motion (SRM, left) and correlation coefficient (CC, right) for the 0.5 degree elevation angle valid 0424 to 0448 UTC 19 August 2021. The Montgomery-Bucks tornado was the only one of the event noted to produce a Tornado Debris Signature (TDS). As the loop plays, a trained eye will recognize the TDS developing just southeast of Perkasie in the form of a concentrated area of reduced CC values corresponding with the rotation. A review of higher elevation data showed the TDS extended to a height of between 8000 and 10000 feet, a value which typically indicates a strong EF1 or EF2 tornado. This tornado was rated a strong EF1 with maximum winds of 105 mph. | Figure 4: Same as Figure 1 valid 0627 to 0644 UTC 19 August 2021. The final tornado of the event occurred in Morris County, New Jersey, a brief EF0 touchdown near Rockaway. It produced about a mile long path of mostly tree and some minor property damage. A small red marker is placed at the approximate touchdown point. Evaluating the radar data, there is very little to indicate a possible tornado from the KDIX radar. There is a general wind shift noted in the SRM data associated with wind shear along the convective line seen in reflectivity data. While a couple of weak and fleeting velocity couplets are seen along the line, they do not appear overly concerning. A relatively high beam height and the weak nature of the circulation made this tornado near impossible to detect from the KDIX radar. |
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| Figure 5: TEWR (Newark, NJ TDWR) storm relative motion (SRM) data for the 0.3 degree elevation angle valid from 0630 to 0642 UTC. The TEWR radar can be a useful tool for identifying potential tornadic circulations over northern New Jersey. It is much closer to the region than the KDIX radar, and also scans at a lower elevation angle (0.3 vs 0.5 degrees). In this instance, the SRM data is considerably more useful. The general wind shift observed in the KDIX data is still seen, but now there are a couple of better-defined velocity couplets. A red marker is again placed near the touchdown point of the Rockaway tornado. A couplet can be seen briefly strengthening as it moves over that point. Another fairly well-defined and sustained couplet is seen west of Morris Plains. The reflectivity data were of poor quality and are not shown. | Figure 6: Multi-radar multi-sensor (MRMS) radar estimated rainfall totals for the 12 hour period ending 1000 UTC 19 August 2021. The remnants of Fred produced torrential rainfall over portions of the area, particularly southeast Pennsylvania. Up to 6 inches of rain fell, most of it in just 2-4 hours, which led to a significant flash flooding event. Several stream gauges exceeded flood stage, and numerous water rescues from vehicles were reported during the hours surrounding midnight. A secondary rainfall maximum occurred near the eastern Lehigh Valley and into northwest New Jersey, where there was also some localized flooding. Conversely, some areas saw little to no rainfall in association with Fred. |
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