Overview
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Following a more than two week stretch of dry weather, a cold front approached the mid-Atlantic on May 26. Ahead of the front, an unseasonably hot and humid air mass developed, with high temperatures near to above 90 degrees in much of the region. This contributed to strong instability, while wind shear was more moderate. Multiple rounds of convection affected the region, triggered by a pre-frontal trough and a couple of upper level impulses ahead of the front. While storms brought much needed rain to the area, a fairly widespread severe weather event also resulted, with damaging winds by far the most widespread hazard. Numerous instances of downed trees and power lines and some property damage were reported. Thunderstorms during the evening hours were also prolific lightning producers. The final round of storms finally moved offshore close to midnight after several hours of severe weather in the region. |
.gif) KDIX radar loop of the severe squall line which affected the region on May 26, 2021 from 2007 UTC to 2313 UTC. An outflow boundary can eventually be seen racing ahead of the line. This caused the primary line to weaken while multiple rounds of new but less intense convection developed along the outflow, including when the outflow boundary met a sea breeze boundary in eastern New Jersey. Another severe thunderstorm can be seen in Berks County late in the loop, and several hours of additional convection were still to come. |
Synoptic Overview at 12z 26 May 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 00z 27 May 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: 15z surface map | Figure 14: 18z surface map | Figure 15: 21z surface map |
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| Figure 16: 00z surface map | Figure 17: 03z surface map | Figure 18: 06z surface map |
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| Figure 19: 12z Sterling, VA sounding | Figure 20: 12z Wallops Island, VA sounding | Figure 21: 18z Albany, NY special sounding |
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| Figure 22: 0z Sterling, VA sounding | Figure 23: 0z Wallops Island, VA sounding | Figure 24: 0z Long Island, NY sounding |
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| Figure 1: National Preliminary Reports 12z 26 May 2021 to 12z 26 May 2021. | Figure 2: Zoomed Preliminary Reports for the same period. | Figure 3: May 26 1300z SPC Convective Outlook. |
Click here for a county warning area based plot of local storm reports and warnings/advisories issued for the 26 May 2021 event.
NWUS51 KPHI 282101
LSRPHI
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
501 PM EDT FRI MAY 28 2021
...REPORTS FROM SEVERE WEATHER EVENT ON MAY 26 2021...
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0411 PM TSTM WND DMG 1 W HAMBURG 40.56N 76.01W
05/26/2021 BERKS PA FIRE DEPT/RESCUE
POWER POLE SNAPPED ON HOLLY ROAD. TIME
ESTIMATED FROM RADAR.
0413 PM TSTM WND DMG 2 SSE PENN TWP 40.44N 76.06W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR GARFIELD
ROAD. TIME ESTIMATED FROM RADAR.
0424 PM TSTM WND GST READING REGIONAL AIRPOR 40.38N 75.97W
05/26/2021 M45 MPH BERKS PA ASOS
0425 PM TSTM WND DMG 1 W READING REGIONAL AI 40.38N 75.99W
05/26/2021 BERKS PA DEPT OF HIGHWAYS
DOWNED TREE ON U.S. HIGHWAY 222 NEAR
BERNVILLE ROAD. TIME ESTIMATED FROM RADAR.
0427 PM TSTM WND DMG 1 E READING REGIONAL AI 40.38N 75.95W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR RIVER ROAD.
TIME ESTIMATED FROM RADAR.
0427 PM TSTM WND DMG 2 SW GREENWICH TWP 40.54N 75.84W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR CHRISTMAN
ROAD. TIME ESTIMATED FROM RADAR.
0427 PM TSTM WND DMG 1 E SOUTH HEIDELBERG TW 40.29N 76.04W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR CHAPEL HILL
ROAD. TIME ESTIMATED FROM RADAR.
0429 PM TSTM WND DMG 1 NW WYOMISSING 40.35N 75.98W
05/26/2021 BERKS PA UTILITY COMPANY
TREE LIMBS AND WIRES DOWN NEAR WESTWOOD
ROAD. TIME ESTIMATED FROM RADAR.
0429 PM TSTM WND DMG 3 N RICHMOND TWP 40.52N 75.83W
05/26/2021 BERKS PA PUBLIC
MPING REPORTS OF TREES UPROOTED AND POWER
POLES SNAPPED NEAR ADAM ROAD. TIME ESTIMATED
FROM RADAR.
0430 PM TSTM WND DMG RICHMOND TWP 40.49N 75.84W
05/26/2021 BERKS PA PUBLIC
SOCIAL MEDIA VIDEO OF A TREE BLOWING DOWN
FROM STRONG WINDS.
0431 PM HAIL 1 WNW FLEETWOOD 40.46N 75.83W
05/26/2021 E0.50 INCH BERKS PA PUBLIC
MPING REPORT OF HALF INCH HAIL.
0433 PM TSTM WND DMG 2 WNW OLEY 40.40N 75.82W
05/26/2021 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON BASKET ROAD. TIME ESTIMATED
FROM RADAR.
0433 PM TSTM WND DMG 1 WNW FLEETWOOD 40.46N 75.83W
05/26/2021 BERKS PA PUBLIC
MPING REPORT OF TREE LIMBS AND WIRES DOWN.
0435 PM TSTM WND DMG 2 N RICHMOND TWP 40.52N 75.84W
05/26/2021 BERKS PA FIRE DEPT/RESCUE
MULTIPLE TREES DOWN ON CRYSTAL RIDGE ROAD.
TIME ESTIMATED FROM RADAR AND DISPATCH
REPORT.
0435 PM TSTM WND DMG 1 SSW KUTZTOWN 40.51N 75.79W
05/26/2021 BERKS PA FIRE DEPT/RESCUE
DOWNED TREES AND WIRES ON KUTZTOWN ROAD.
TIME ESTIMATED FROM RADAR.
0435 PM TSTM WND DMG 1 WSW KUTZTOWN 40.52N 75.79W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR LYTLE LANE.
TIME ESTIMATED FROM RADAR.
0439 PM TSTM WND DMG 1 ENE LYONS 40.48N 75.74W
05/26/2021 BERKS PA UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE BOWERS AREA. TIME ESTIMATED FROM RADAR.
0440 PM TSTM WND DMG 1 NW DISTRICT TWP 40.47N 75.67W
05/26/2021 BERKS PA COCORAHS
TREE DOWN REPORTED WITH HIGH WINDS AND PEA
SIZED HAIL.
0446 PM TSTM WND GST MERTZTOWN 40.51N 75.67W
05/26/2021 M45 MPH BERKS PA PUBLIC
CWOP STATION MEASURED GUST.
0448 PM TSTM WND DMG 1 N MERTZTOWN 40.53N 75.67W
05/26/2021 BERKS PA UTILITY COMPANY
SEVERAL REPORTS OF TREES AND WIRES DOWN IN
THE KLINES CORNER AND MAXATAWNY AREAS. TIME
ESTIMATED FROM RADAR.
0448 PM TSTM WND DMG 3 W DOUGLASS TWP 40.32N 75.73W
05/26/2021 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON POWDER MILL HOLLOW ROAD. TIME
ESTIMATED FROM RADAR.
0448 PM TSTM WND DMG 1 NNE TOPTON 40.51N 75.70W
05/26/2021 BERKS PA PUBLIC
MPING REPORT OF DOWNED TREE LIMBS AND POWER
LINES NEAR OLD TOPTON ROAD. TIME ESTIMATED
FROM RADAR.
0448 PM TSTM WND DMG 2 SSW DISTRICT TWP 40.43N 75.66W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR FORGE DALE ROAD.
TIME ESTIMATED FROM RADAR.
0450 PM TSTM WND DMG 1 NW BALLY 40.41N 75.60W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR HILLCREST ROAD.
TIME ESTIMATED FROM RADAR.
0452 PM TSTM WND DMG MERTZTOWN 40.51N 75.67W
05/26/2021 BERKS PA PUBLIC
MPING REPORT OF DOWNED TREE LIMBS AND POWER
LINES NEAR VALLEY ROAD. TIME ESTIMATED FROM
RADAR.
0453 PM HAIL 1 WSW TOPTON 40.49N 75.72W
05/26/2021 E0.50 INCH BERKS PA PUBLIC
MPING REPORT OF HALF INCH HAIL.
0453 PM TSTM WND DMG 1 NNW COLEBROOKDALE TWP 40.35N 75.66W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR IRONSTONE DRIVE.
TIME ESTIMATED FROM RADAR.
0453 PM TSTM WND DMG 1 ENE HUFFS CHURCH 40.45N 75.60W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR MULBERRY HILL
ROAD. TIME ESTIMATED FROM RADAR.
0454 PM TSTM WND DMG 3 WSW ALLENTOWN 40.58N 75.53W
05/26/2021 LEHIGH PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR HICKORY
CIRCLE. TIME ESTIMATED FROM RADAR.
0455 PM TSTM WND DMG ALLENTOWN 40.60N 75.47W
05/26/2021 LEHIGH PA TRAINED SPOTTER
SOCIAL MEDIA PHOTO OF A SNAPPED TREE IN A
NEIGHBORHOOD NEAR ALLENTOWN. TIME CORRECTED
BASED ON RADAR.
0455 PM TSTM WND DMG 1 NNW UPPER HANOVER TWP 40.42N 75.53W
05/26/2021 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE ON ZIEGLER ROAD NEAR GRAVEL
PIKE. TIME ESTIMATED FROM RADAR.
0455 PM TSTM WND DMG 3 WSW ALLENTOWN 40.58N 75.52W
05/26/2021 LEHIGH PA UTILITY COMPANY
DOWNED WIRES NEAR HAINES MILL ROAD. TIME
ESTIMATED FROM RADAR.
0455 PM TSTM WND DMG 3 NW EMMAUS 40.57N 75.53W
05/26/2021 LEHIGH PA EMERGENCY MNGR
6 HOMES ALONG OAKWOOD TRAIL AND DOGWOOD
TRAIL DAMAGED BY STRONG WIND GUSTS AND
FALLEN TREES.
0458 PM TSTM WND DMG 3 SW ALLENTOWN 40.57N 75.52W
05/26/2021 LEHIGH PA UTILITY COMPANY
SEVERAL REPORTS OF TREES AND WIRES DOWN
SOUTHWEST OF ALLENTOWN. TIME ESTIMATED FROM
RADAR.
0458 PM TSTM WND DMG 3 ENE ANCIENT OAKS 40.57N 75.55W
05/26/2021 LEHIGH PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR KRESSLER ROAD.
TIME ESTIMATED FROM RADAR.
0458 PM TSTM WND DMG 1 ESE NEW HANOVER TWP 40.30N 75.57W
05/26/2021 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE ON REIFSNYDER ROAD NEAR SWAMP
PICNIC ROAD. TIME ESTIMATED FROM RADAR.
0458 PM TSTM WND DMG 2 W UPPER HANOVER TWP 40.40N 75.55W
05/26/2021 MONTGOMERY PA DEPT OF HIGHWAYS
DOWNED TREE IN WIRES ON KUTZTOWN ROAD NEAR
TOWNSHIP WOODS ROAD. TIME ESTIMATED FROM
RADAR.
0458 PM TSTM WND DMG 2 ESE DOUGLASS TWP 40.30N 75.65W
05/26/2021 MONTGOMERY PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR FARMINGTON
AVENUE ON THE BERKS/MONTGOMERY COUNTY
BORDER. TIME ESTIMATED FROM RADAR.
0458 PM TSTM WND DMG 2 SW REIFFTON 40.29N 75.90W
05/26/2021 BERKS PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR RIDGEWAY
ROAD. TIME ESTIMATED FROM RADAR.
0500 PM TSTM WND GST 1 SE MACUNGIE 40.51N 75.54W
05/26/2021 M40 MPH LEHIGH PA PUBLIC
CWOP MEASURED GUST.
0505 PM TSTM WND DMG 1 W UPPER SALFORD TWP 40.29N 75.47W
05/26/2021 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE ON SALFORD STATION ROAD NEAR
CEPP ROAD. TIME ESTIMATED FROM RADAR.
0505 PM TSTM WND DMG 3 E ZIONSVILLE 40.49N 75.45W
05/26/2021 LEHIGH PA DEPT OF HIGHWAYS
DOWNED TREE NEAR THE INTERSECTION OF
LIMEPORT PIKE AND CHESTNUT HILL CHURCH ROAD.
TIME ESTIMATED FROM RADAR.
0505 PM TSTM WND DMG 1 WNW PERKIOMENVILLE 40.34N 75.51W
05/26/2021 MONTGOMERY PA TRAINED SPOTTER
SEVERAL DOWNED TREES AND A POWER POLE DOWN.
TIME ESTIMATED FROM RADAR.
0505 PM TSTM WND DMG 2 WSW RED HILL 40.36N 75.52W
05/26/2021 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE ON WARD ROAD. TIME ESTIMATED
FROM RADAR.
0507 PM TSTM WND DMG 1 WNW SELLERSVILLE 40.37N 75.32W
05/26/2021 BUCKS PA UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES
NEAR AND WEST OF SELLERSVILLE. TIME
ESTIMATED FROM RADAR.
0509 PM TSTM WND DMG 1 ENE WEST ROCKHILL TWP 40.38N 75.33W
05/26/2021 BUCKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR MOUNTAIN VIEW
ROAD. TIME ESTIMATED FROM RADAR.
0510 PM TSTM WND DMG 1 S MILFORD TWP 40.41N 75.42W
05/26/2021 BUCKS PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR WALNUT
LANE. TIME ESTIMATED FROM RADAR.
0512 PM HAIL GILBERTSVILLE 40.32N 75.61W
05/26/2021 E0.70 INCH MONTGOMERY PA PUBLIC
0514 PM TSTM WND DMG HELLERTOWN 40.58N 75.34W
05/26/2021 NORTHAMPTON PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR FRONT STREET.
TIME ESTIMATED FROM RADAR.
0516 PM TSTM WND DMG 2 WNW RICHLAND TWP 40.49N 75.36W
05/26/2021 BUCKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR KELLERS ROAD AND
MINE ROAD. TIME ESTIMATED FROM RADAR.
0518 PM HAIL 1 WNW WASHINGTON TWP 40.40N 75.61W
05/26/2021 M0.75 INCH BERKS PA TRAINED SPOTTER
REPORT FROM BARTO.
0520 PM TSTM WND GST 1 NE SALFORD TWP 40.36N 75.37W
05/26/2021 E60 MPH BUCKS PA BROADCAST MEDIA
BROADCAST METEOROLOGIST ESTIMATES 60-65 MPH
WIND GUSTS NEAR ALLENTOWN ROAD AND COUNTY
LINE ROAD.
0521 PM TSTM WND DMG 2 WSW ALPHA 40.65N 75.20W
05/26/2021 WARREN NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR RIVER ROAD AND
MANOR ROAD. TIME ESTIMATED FROM RADAR.
0521 PM TSTM WND DMG 1 W OTTSVILLE 40.47N 75.17W
05/26/2021 BUCKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR PARK ROAD. TIME
ESTIMATED FROM RADAR AND UTILITY REPORT.
0521 PM TSTM WND DMG 1 NE MONTGOMERYVILLE 40.27N 75.23W
05/26/2021 MONTGOMERY PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR COUNTY LINE ROAD
AND BUSINESS ROUTE 202. TIME ESTIMATED FROM
RADAR.
0522 PM TSTM WND DMG WILLIAMS TWP 40.64N 75.20W
05/26/2021 NORTHAMPTON PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NORTH OF
RAUBSVILLE ROAD. TIME ESTIMATED FROM RADAR.
0523 PM TSTM WND DMG 3 W HARMONY 40.74N 75.19W
05/26/2021 WARREN NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR HARMONY STATION
ROAD AND RIVER ROAD. TIME ESTIMATED FROM
RADAR.
0523 PM TSTM WND DMG 2 N BLUE BELL 40.18N 75.26W
05/26/2021 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE BLOCKING OVERBROOK DRIVE NEAR
GWYNEDD VALLEY DRIVE. TIME ESTIMATED FROM
RADAR.
0525 PM TSTM WND DMG 1 SW DURHAM TWP 40.57N 75.23W
05/26/2021 BUCKS PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR ROUTE 212 IN
DURHAM TWP. TIME ESTIMATED FROM RADAR.
0525 PM TSTM WND DMG 2 NW RIEGELSVILLE 40.61N 75.22W
05/26/2021 NORTHAMPTON PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR COFFETOWN
ROAD. TIME ESTIMATED FROM RADAR.
0527 PM TSTM WND DMG PAOLI 40.04N 75.49W
05/26/2021 CHESTER PA COUNTY OFFICIAL
DOWNED WIRES ON WISTAR ROAD NEAR CHETWYND
ROAD. TIME ESTIMATED FROM RADAR.
0527 PM TSTM WND DMG 2 SSW EAST NANTMEAL TWP 40.10N 75.73W
05/26/2021 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON BUCK DRIVE NEAR RABBIT RUN
LANE. TIME ESTIMATED FROM RADAR.
0530 PM TSTM WND DMG 1 SSW PHOENIXVILLE 40.13N 75.52W
05/26/2021 CHESTER PA PUBLIC
DOWNED TREE LIMBS ON FOURTH AVENUE AND
LINCOLN AVENUE. TIME ESTIMATED FROM RADAR.
0532 PM TSTM WND DMG 2 S EAST NANTMEAL TWP 40.09N 75.72W
05/26/2021 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON STYER ROAD NEAR MEADOW CREEK
LANE. TIME ESTIMATED FROM RADAR.
0535 PM TSTM WND GST 1 ENE POHATCONG TWP 40.66N 75.12W
05/26/2021 M44 MPH WARREN NJ MESONET
NJWXNET MEASURED GUST.
0535 PM TSTM WND DMG 2 S MONTANA 40.74N 75.08W
05/26/2021 WARREN NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR MONTANA ROAD.
TIME ESTIMATED FROM RADAR.
0535 PM HAIL BEDMINSTER 40.43N 75.18W
05/26/2021 E0.88 INCH BUCKS PA TRAINED SPOTTER
TIME ESTIMATED FROM RADAR.
0539 PM TSTM WND DMG 1 ESE HATBORO 40.16N 75.09W
05/26/2021 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE LIMBS ON DAVISVILLE ROAD AND
DANIELLE DRIVE. TIME ESTIMATED FROM RADAR.
0539 PM TSTM WND DMG 1 NW BETHLEHEM TWP 40.67N 75.03W
05/26/2021 HUNTERDON NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR ASBURY WEST
PORTAL ROAD. TIME ESTIMATED FROM RADAR.
0544 PM TSTM WND DMG OXFORD 39.79N 75.97W
05/26/2021 CHESTER PA UTILITY COMPANY
DOWNED TREES AND WIRES NEAR SIXTH STREET AND
MARKET STREET. TIME ESTIMATED FROM RADAR.
0549 PM TSTM WND DMG LINCOLN UNIVERSITY 39.80N 75.93W
05/26/2021 CHESTER PA UTILITY COMPANY
DOWNED WIRES NEAR LOOP ROAD. TIME ESTIMATED
FROM RADAR.
0552 PM TSTM WND DMG LONDONDERRY TWP 39.86N 75.88W
05/26/2021 CHESTER PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR MINDY
DRIVE. TIME ESTIMATED FROM RADAR.
0552 PM TSTM WND DMG LEBANON TWP 40.72N 74.89W
05/26/2021 HUNTERDON NJ UTILITY COMPANY
DOWNED WIRES NEAR BUNNVALE ROAD AND HILL
DRIVE EAST. TIME ESTIMATED FROM RADAR.
0554 PM TSTM WND DMG 2 W MCPHERSON 40.61N 74.88W
05/26/2021 HUNTERDON NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR ALLERTON AND
CLINTON. TIME ESTIMATED FROM RADAR.
0554 PM TSTM WND DMG LONDONDERRY TWP 39.86N 75.88W
05/26/2021 CHESTER PA UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR DALEVILLE
ROAD. TIME ESTIMATED FROM RADAR.
0556 PM TSTM WND DMG SCHOOLEYS MOUNTAIN 40.81N 74.82W
05/26/2021 MORRIS NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR SCHOOLEYS
MOUNTAIN ROAD. TIME ESTIMATED FROM RADAR.
0556 PM TSTM WND DMG TACONY 40.03N 75.05W
05/26/2021 PHILADELPHIA PA PUBLIC
MPING REPORT OF WIND DAMAGE NEAR GLENLOCH
STREET. TIME ESTIMATED FROM RADAR.
0559 PM TSTM WND DMG 2 ENE THREE BRIDGES 40.53N 74.77W
05/26/2021 HUNTERDON NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR SUMMER ROAD.
TIME ESTIMATED FROM RADAR.
0600 PM TSTM WND GST WEST GROVE 39.86N 75.84W
05/26/2021 M48 MPH CHESTER PA MESONET
DEOS MEASURED GUST.
0600 PM TSTM WND GST 1 WSW EWING 40.27N 74.81W
05/26/2021 E60 MPH MERCER NJ TRAINED SPOTTER
WIDESPREAD POWER OUTAGES IN THE AREA. TIME
ESTIMATED FROM RADAR.
0604 PM TSTM WND DMG 1 SSE TRENTON 40.19N 74.75W
05/26/2021 MERCER NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR BUNTING
AVENUE. TIME ESTIMATED FROM RADAR.
0605 PM TSTM WND DMG 2 WSW MANVILLE 40.54N 74.61W
05/26/2021 SOMERSET NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES REPORTED IN A
FEW LOCATIONS IN THE MANVILLE AREA. TIME
ESTIMATED FROM RADAR.
0606 PM HAIL LEBANON 40.64N 74.84W
05/26/2021 E0.50 INCH HUNTERDON NJ TRAINED SPOTTER
0607 PM TSTM WND DMG 1 NNW WINDSOR 40.26N 74.59W
05/26/2021 MERCER NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR SOUTH LANE.
TIME ESTIMATED FROM RADAR.
0608 PM TSTM WND DMG 1 NNW MANVILLE 40.57N 74.59W
05/26/2021 SOMERSET NJ TRAINED SPOTTER
TREE SPLIT IN HALF.
0612 PM TSTM WND DMG 1 ESE DAYTON 40.37N 74.50W
05/26/2021 MIDDLESEX NJ DEPT OF HIGHWAYS
DOWNED TREE ON U.S. HIGHWAY 130 SOUTHBOUND
RAMP TO RIDGE ROAD. ALL LANES CLOSED. TIME
ESTIMATED FROM RADAR.
0614 PM TSTM WND DMG 1 S SOMERVILLE 40.56N 74.62W
05/26/2021 SOMERSET NJ UTILITY COMPANY
REPORTS OF DOWNED TREES AND WIRES IN THE
SOMERVILLE AREA. TIME ESTIMATED FROM RADAR.
0614 PM TSTM WND DMG MENDHAM 40.78N 74.60W
05/26/2021 MORRIS NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
MENDHAM. TIME ESTIMATED FROM RADAR.
0617 PM TSTM WND DMG 3 ESE SOUTH BOUND BROOK 40.54N 74.48W
05/26/2021 MIDDLESEX NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR SEYMOUR
TERRACE. TIME ESTIMATED FROM RADAR.
0617 PM TSTM WND DMG 1 NW BROOKSIDE 40.80N 74.58W
05/26/2021 MORRIS NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR WOODLAND
ROAD. TIME ESTIMATED FROM RADAR.
0619 PM TSTM WND DMG 1 N BASKING RIDGE 40.72N 74.55W
05/26/2021 SOMERSET NJ DEPT OF HIGHWAYS
DOWNED TREE ON U.S. HIGHWAY 202 SOUTHBOUND
NORTH OF COUNTY ROAD 613. LANE RESTRICTIONS
REQUIRED. TIME ESTIMATED FROM RADAR.
0619 PM TSTM WND DMG 3 SE SOUTH BOUND BROOK 40.53N 74.48W
05/26/2021 MIDDLESEX NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR RIVERCREST
DRIVE. TIME ESTIMATED FROM RADAR.
0622 PM TSTM WND DMG 1 WNW MILLINGTON 40.68N 74.53W
05/26/2021 SOMERSET NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES REPORTED IN
SEVERAL LOCATIONS BETWEEN LYONS AND
MILLINGTON. TIME ESTIMATED FROM RADAR.
0624 PM TSTM WND DMG 1 SE LONG HILL TWP 40.68N 74.47W
05/26/2021 MORRIS NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR MOUNTAIN
AVENUE. TIME ESTIMATED FROM RADAR.
0627 PM TSTM WND DMG 3 NE LONG HILL TWP 40.71N 74.43W
05/26/2021 MORRIS NJ UTILITY COMPANY
DOWNED TREES AND WIRES REPORTED IN LONG HILL
AND MILLINGTON. TIME ESTIMATED FROM RADAR.
0627 PM TSTM WND DMG 1 NE WATCHUNG 40.65N 74.44W
05/26/2021 SOMERSET NJ UTILITY COMPANY
DOWNED TREES AND WIRES NEAR VALLEY ROAD.
TIME ESTIMATED FROM RADAR.
0629 PM TSTM WND DMG 1 WSW FOX HILL 40.87N 74.46W
05/26/2021 MORRIS NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR PARK ROAD.
TIME ESTIMATED FROM RADAR.
0630 PM TSTM WND DMG 1 ESE DENVILLE 40.85N 74.47W
05/26/2021 MORRIS NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR TABOR ROAD.
TIME ESTIMATED FROM RADAR.
0639 PM TSTM WND DMG ABERDEEN 40.41N 74.22W
05/26/2021 MONMOUTH NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR DEERFIELD
LANE. TIME ESTIMATED FROM RADAR.
0649 PM TSTM WND DMG CENTERVILLE 40.41N 74.16W
05/26/2021 MONMOUTH NJ DEPT OF HIGHWAYS
DOWNED TREE ON STATE HIGHWAY 35 NEAR
MULBERRY LANE. ALL LANES CLOSED. TIME
ESTIMATED FROM RADAR.
0654 PM TSTM WND GST 3 ESE FARMINGDALE 40.19N 74.12W
05/26/2021 M43 MPH MONMOUTH NJ AWOS
0700 PM TSTM WND GST SANDY HOOK 40.47N 74.01W
05/26/2021 M54 MPH MONMOUTH NJ OTHER FEDERAL
USGS GAUGE.
0700 PM MARINE TSTM WIND SANDY HOOK 40.47N 74.01W
05/26/2021 M54 MPH MONMOUTH NJ OTHER FEDERAL
USGS GAUGE.
0705 PM TSTM WND DMG 1 WSW BRIELLE 40.11N 74.08W
05/26/2021 MONMOUTH NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES REPORTED IN A
FEW LOCATIONS IN AND NEAR THE BRIELLE AREA.
TIME ESTIMATED FROM RADAR.
0710 PM MARINE TSTM WIND 1 ESE MANASQUAN 40.12N 74.03W
05/26/2021 M39 MPH MONMOUTH NJ MESONET
0722 PM HAIL BRICK 40.06N 74.14W
05/26/2021 E0.50 INCH OCEAN NJ TRAINED SPOTTER
0726 PM HAIL TOMS RIVER 39.95N 74.20W
05/26/2021 E0.70 INCH OCEAN NJ PUBLIC
SOCIAL MEDIA REPORTS OF DIME SIZED HAIL.
0726 PM TSTM WND DMG MERTZTOWN 40.51N 75.67W
05/26/2021 BERKS PA PUBLIC
DELAYED MPING REPORT OF 3-INCH TREE LIMBS;
POWER POLES BROKEN. TIME ESTIMATED BASED ON
RADAR.
0729 PM MARINE TSTM WIND 2 SSW MANTOLOKING 40.01N 74.06W
05/26/2021 M43 MPH OCEAN NJ MESONET
WXFLOW SENSOR.
0738 PM MARINE TSTM WIND SEASIDE HEIGHTS 39.94N 74.07W
05/26/2021 M59 MPH OCEAN NJ MESONET
NJWXNET MEASURED GUST.
0738 PM TSTM WND GST SEASIDE HEIGHTS 39.94N 74.07W
05/26/2021 M59 MPH OCEAN NJ MESONET
NJWXNET MEASURED GUST.
0741 PM MARINE TSTM WIND SEASIDE PARK 39.94N 74.07W
05/26/2021 M40 MPH OCEAN NJ MESONET
0750 PM MARINE TSTM WIND 2 SSW SEASIDE PARK 39.91N 74.09W
05/26/2021 M40 MPH ANZ451 NJ MESONET
0824 PM MARINE TSTM WIND BRANDYWINE SHOAL LIGHT 38.99N 75.11W
05/26/2021 M49 MPH ANZ431 NJ BUOY
BRND1 GUSTED TO 49 MPH, THEN PEAKED AT 82
MPH AT 8:42 PM. ANEMOMETER HEIGHT IS 21
METERS.
1015 PM TSTM WND DMG 1 NW ELMER 39.60N 75.18W
05/26/2021 SALEM NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREE LIMBS AND
WIRES IN FAR NORTHEASTERN PORTIONS OF SALEM
COUNTY. TIME ESTIMATED FROM RADAR.
1019 PM TSTM WND DMG 1 SE THOROFARE 39.83N 75.19W
05/26/2021 GLOUCESTER NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREE LIMBS AND
WIRES NEAR JESSUP ROAD AND IN WEST DEPTFORD
TWP. TIME ESTIMATED FROM RADAR.
1022 PM TSTM WND DMG 1 SW PENNSAUKEN 39.95N 75.08W
05/26/2021 CAMDEN NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREE LIMBS AND
WIRES IN THE PENNSAUKEN AREA. TIME ESTIMATED
FROM RADAR.
1023 PM TSTM WND DMG PALMYRA 40.00N 75.02W
05/26/2021 BURLINGTON NJ PUBLIC
CORRECTS PREVIOUS TSTM WND DMG REPORT FROM
PALMYRA. TREES DOWN IN PALMYRA.
1027 PM TSTM WND DMG 3 NW WILLIAMSTOWN 39.72N 75.04W
05/26/2021 GLOUCESTER NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREE LIMBS AND
WIRES NEAR GLASSBORO CROSS KEYS ROAD. TIME
ESTIMATED FROM RADAR.
1030 PM MARINE TSTM WIND FORTESCUE 39.24N 75.18W
05/26/2021 M43 MPH CUMBERLAND NJ MESONET
NJWXNET SENSOR.
1035 PM TSTM WND GST 2 SW RANCOCAS 39.99N 74.89W
05/26/2021 M50 MPH BURLINGTON NJ MESONET
BURLINGTON COUNTY COMMUNITY AGRICULTURAL
CENTER NJ WEATHER NETWORK.
1035 PM TSTM WND DMG 1 ENE SICKLERVILLE 39.72N 74.96W
05/26/2021 CAMDEN NJ UTILITY COMPANY
DOWNED WIRES NEAR HEMLOCK LANE. TIME
ESTIMATED FROM RADAR.
1037 PM TSTM WND DMG 1 SE WILLINGBORO 40.02N 74.88W
05/26/2021 BURLINGTON NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR GLOBE LANE.
TIME ESTIMATED FROM RADAR.
1040 PM TSTM WND DMG 1 NNE RANCOCAS 40.03N 74.86W
05/26/2021 BURLINGTON NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR NOTTINGHAM
DRIVE. TIME ESTIMATED FROM RADAR.
1042 PM TSTM WND DMG MOUNT HOLLY 39.99N 74.78W
05/26/2021 BURLINGTON NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR SHREVE
STREET. TIME ESTIMATED FROM RADAR.
1042 PM TSTM WND DMG 1 SSE MOUNT HOLLY WFO 40.00N 74.81W
05/26/2021 BURLINGTON NJ UTILITY COMPANY
DOWNED WIRES NEAR LAMBERT DRIVE. TIME
ESTIMATED FROM RADAR.
1045 PM MARINE TSTM WIND 5 E LONG NECK 38.61N 75.06W
05/26/2021 M39 MPH SUSSEX DE MESONET
1047 PM TSTM WND DMG 3 N MULLICA TWP 39.64N 74.70W
05/26/2021 ATLANTIC NJ UTILITY COMPANY
DOWNED WIRES NEAR NESCO ROAD. TIME ESTIMATED
FROM RADAR.
1048 PM MARINE TSTM WIND 1 E BARNEGAT LIGHT 39.76N 74.09W
05/26/2021 M44 MPH ANZ451 NJ MESONET
1053 PM TSTM WND DMG MEDFORD 39.89N 74.82W
05/26/2021 BURLINGTON NJ PUBLIC
TREE DOWN IN MEDFORD. TIME ESTIMATED BY
RADAR.
1053 PM TSTM WND DMG 4 ENE MULLICA TWP 39.61N 74.63W
05/26/2021 ATLANTIC NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR WEEKSTOWN
ROAD. TIME ESTIMATED FROM RADAR.
1107 PM MARINE TSTM WIND 1 SSW NORTH CAPE MAY 38.97N 74.96W
05/26/2021 M40 MPH CAPE MAY NJ MESONET
1108 PM MARINE TSTM WIND 2 WNW LEWES 38.79N 75.16W
05/26/2021 M41 MPH SUSSEX DE MESONET
WXFLOW GAUGE.
1110 PM MARINE TSTM WIND INDIAN BEACH 38.68N 75.08W
05/26/2021 M47 MPH SUSSEX DE MESONET
WXFLOW GAUGE.
1118 PM MARINE TSTM WIND 1 ENE LEWES 38.78N 75.12W
05/26/2021 M39 MPH ANZ431 DE MESONET
1120 PM TSTM WND DMG EAGLESWOOD TWP 39.63N 74.32W
05/26/2021 OCEAN NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES NEAR SEA BREEZE
DRIVE. TIME ESTIMATED FROM RADAR.
1122 PM MARINE TSTM WIND 4 SE MYSTIC ISLAND 39.52N 74.32W
05/26/2021 M40 MPH OCEAN NJ MESONET
1129 PM MARINE TSTM WIND 2 WNW SHIP BOTTOM 39.66N 74.21W
05/26/2021 M43 MPH ANZ451 NJ MESONET
LBI ISLAND SURF WEATHERFLOW STATION.
1130 PM MARINE TSTM WIND 2 NNE WARETOWN 39.82N 74.18W
05/26/2021 M44 MPH OCEAN NJ PUBLIC
1135 PM MARINE TSTM WIND 1 ESE LANOKA HARBOR 39.86N 74.13W
05/26/2021 M40 MPH OCEAN NJ PUBLIC
1136 PM TSTM WND DMG 1 SSW LAVALLETTE 39.96N 74.08W
05/26/2021 OCEAN NJ UTILITY COMPANY
DOWNED WIRES NEAR WASHINGTON AVENUE. TIME
ESTIMATED FROM RADAR.
1136 PM MARINE TSTM WIND SEASIDE HEIGHTS 39.94N 74.07W
05/26/2021 M47 MPH OCEAN NJ MESONET
SEASIDE HEIGHTS WEATHERFLOW STATION.
1136 PM MARINE TSTM WIND 1 NE LANOKA HARBOR 39.88N 74.14W
05/26/2021 M45 MPH ANZ451 NJ MESONET
TRIXIES WEATHERFLOW STATION.
1138 PM MARINE TSTM WIND 2 SSW SEASIDE PARK 39.91N 74.09W
05/26/2021 M39 MPH ANZ451 NJ MESONET
1140 PM MARINE TSTM WIND 1 WSW LAVALLETTE 39.96N 74.08W
05/26/2021 M44 MPH OCEAN NJ PUBLIC
1140 PM MARINE TSTM WIND 1 SSW MANTOLOKING 40.02N 74.06W
05/26/2021 M41 MPH OCEAN NJ PUBLIC
&&
$$
CMS/AS/RD/JM/PF/LR
Notable Radar Imagery (GR2Analyst and AWIPS)
 |
 |
| Figure 1: KDIX radar reflectivity factor (left) and base velocity (right) for the 0.5 degree elevation angle valid 2105 UTC 26 May 2021. A severe squall line over eastern Pennsylvania was near its peak intensity at this time, just as its outflow was beginning to escape ahead of it. Dozens of reports of downed trees and power lines were received in association with this line. The base velocity image on the right indicated widespread velocities of 45 to 55 kt, consistent with the level of damage observed in the region. | Figure 2: KDIX radar reflectivity cross-section taken along the line of storm cells at the same time as in Figure 1. The cross-section indicates a healthy and very intense line of storms. Multiple distinct, individual updrafts can be seen. The convection is also very deep thanks to the strong instability that was in place. 50dbz echoes (red) extent as high as 30,000 feet, with 40dbz echoes (yellow) up to 40,000 feet, both very impressive values. |
 |
 |
| Figure 3: Another look at the same severe squall line as in Figure 1, this time from the TPHL radar at 2113 UTC 26 May 2021. The lower beam height and higher sensitivity of the TPHL radar gives a better idea of how an outflow boundary was beginning to race ahead of this squall line. This would soon cause the line to begin weakening, while new but less intense convection would start to develop closer to the outflow boundary. This process is seen in the KDIX loop in the Overview section. Another boundary, the sea breeze, can be seen over eastern New Jersey. The two boundaries would later collide and help to initiate additional convection near the coast, also seen in the KDIX loop. | Figure 4: TPHL base velocity for the 0.4 degree elevation angle valid 2113 UTC 26 May 2021, the same time as Figure 3. Multiple intense wind cores are seen, with the bright white and blue colors representing radar-derived velocities of up to 60 kt as widespread wind damage was occurring. The outline of the outflow boundary from Figure 3 can also be seen. The TPHL radar frequently serves as a valuable tool for warning forecasters at WFO Mount Holly, especially for convection over southeast Pennsylvania and southern New Jersey. |
 |
 |
| Figure 5: Same as Figure 1 valid at 0229 UTC 27 May 2021, or 10:29 PM EDT. Another area of convection began to intensify as it moved through the Philadelphia metro area and especially as it moved into southern New Jersey, where it became severe. The base velocity image shows some 45 to 55 kt values, and patchy wind damage was reported. In addition, this round of storms became a prolific producer of lightning. Multiple NWS employees in the local area noted it was among the most intense displays of lightning in the area in years. | Figure 6: Same as Figure 4, this time valid at 0229 UTC 27 May 2021 (the same time as Figure 5). A prominent downburst signature is seen just on the north side of the border between Camden and Burlington Counties. Base velocities of 50 to 60 kt were detected, and wind damage was reported in the area. One of the TPHL radar’s greatest strengths is high quality downburst detection within about 25 miles of the radar site. |
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