Overview
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A surface trough developed in eastern Pennsylvania southwestward through central Virginia on 3 August 2018. In advance of the trough, a long fetch of anomalously moist air was transported northward to the west of a strong ridge of high pressure in the western Atlantic. With the aid of a shortwave trough approaching the region, convection developed near the trough axis during the evening and continued to regenerate on the southwest side as the predecessor storms moved northeastward. As the storms continued to train over Berks County northeastward through the Lehigh Valley into northern New Jersey, a swath of 2-5+ inches of rainfall accumulated in this corridor by daybreak. Several reports of flooding were received, especially from Berks, Lehigh, and Northampton Counties. During the morning, the axis of convection moved northeastward into more urban portions of northern and central New Jersey. Though rainfall amounts were lower in these areas, flash flooding occurred owing to the high rain rates combined with the rapid runoff from increased urbanization. |
 Radar Reflectivity Animation for the Event (via GR2Analyst) |
Synoptic Overview at 12z 3 Aug 2018 (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 4 Aug 2018 (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: 18z surface map | Figure 14: 21z surface map | Figure 15: 00z surface map |
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| Figure 16: 03z surface map | Figure 17: 06z surface map | Figure 18: 09z surface map |
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| Figure 19: 12z Upton, NY sounding | Figure 20: 12z Wallops Island, VA sounding | Figure 21: 12z Sterling, VA sounding |
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| Figure 22: 00z Upton, NY sounding | Figure 23: 00z Wallops Island, VA sounding | Figure 24: 00z Sterling, VA sounding |
One-Hour Polarimetric Rainfall Accumulations (via GR2Analyst)
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| Figure 1: KDIX 1-hr rainfall accumulations via polarimetric estimation ending at 0200 UTC 4 Aug 2018. | Figure 2: Same as Fig. 1, ending at 0700 UTC 4 Aug 2018. | Figure 3: Same as Fig. 1, ending at 1230 UTC 4 Aug 2018. |
Storm Total Polarimetric Rainfall Accumulations (via GR2Analyst)
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| Figure 4: KDIX storm total rainfall accumulations via polarimetric estimation ending at 0300 UTC 4 Aug 2018. | Figure 5: Same as Fig. 4, ending at 0600 UTC 4 Aug 2018. |
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| Figure 6: Same as Fig. 4, ending at 0900 UTC 4 Aug 2018. | Figure 7: Same as Fig. 4, ending at 1200 UTC 4 Aug 2018. |
Areal Flood Advisory 0187 Areal Flood Advisory 0188 Areal Flood Advisory 0189 Flash Flood Warning 0049 Areal Flood Advisory 0190 Flash Flood Warning 0050 Areal Flood Advisory 0191 Areal Flood Advisory 0192 Areal Flood Advisory 0193 Areal Flood Advisory 0194 Areal Flood Warning 0046 Areal Flood Advisory 0195 Areal Flood Advisory 0196 Areal Flood Warning 0047 Areal Flood Warning 0048 Areal Flood Advisory 0197 Areal Flood Advisory 0198 Areal Flood Advisory 0199 Areal Flood Advisory 0200 Flash Flood Warning 0051 River Flood Warning 0026 Areal Flood Advisory 0201 Areal Flood Advisory 0202 Areal Flood Warning 0049 River Flood Warning 0027 Flash Flood Warning 0052 Areal Flood Warning 0050 Areal Flood Warning 0051 River Flood Warning 0028 Areal Flood Warning 0052 River Flood Warning 0029
NWUS51 KPHI 050943
LSRPHI
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
542 AM EDT SUN AUG 05 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0915 PM TSTM WND DMG WYOMISSING 40.33N 75.96W
08/03/2018 BERKS PA SOCIAL MEDIA
SEVERAL REPORTS OF TREES AND WIRES DOWN IN BERKS COUNTY
FROM EARL TWP THROUGH WYOMISSING AND READING INTO EXETER
AND RUSCOMBMANOR TOWNSHIPS. GENERAL TIMING FROM 915 PM
TO 945 PM BASED ON RADAR.
0924 PM FLASH FLOOD 1 S COUNTRY RIDGE ESTAT 40.35N 76.19W
08/03/2018 BERKS PA SOCIAL MEDIA
WATER RESCUE ON BRICKPLANT ROAD IN HEIDELBERG TWP.
1018 PM FLOOD FRITZTOWN 40.30N 76.06W
08/03/2018 BERKS PA SOCIAL MEDIA
BASEMENT FLOODING AT A RESIDENCE ON FRITZTOWN ROAD.
1032 PM FLOOD FRITZTOWN 40.30N 76.07W
08/03/2018 BERKS PA SOCIAL MEDIA
FRITZTOWN ROAD IS FLOODED IN SOUTH HEIDELBERG TWP.
1038 PM FLOOD TOPTON 40.50N 75.70W
08/03/2018 BERKS PA SOCIAL MEDIA
INTERSECTION OF WEST WEIS STREET AND SOUTH CALLOWHILL
STREET IN TOPTON IS FLOODED.
1047 PM FLOOD GRIESEMERSVILLE 40.59N 75.50W
08/03/2018 LEHIGH PA SOCIAL MEDIA
STREET FLOODING ON HAMILTON STREET NEAR CEDAR CREEK.
1049 PM FLOOD SEYFERT 40.29N 75.88W
08/03/2018 BERKS PA SOCIAL MEDIA
BASEMENT FLOODING AT A RESIDENCE ON OLD RIVER ROAD IN
ROBESON TWP.
1055 PM FLOOD 1 NE OLEY FURNACE 40.42N 75.78W
08/03/2018 BERKS PA SOCIAL MEDIA
BASEMENT FLOODING AND POTENTIAL FLOOD DAMAGE TO A
RESIDENCE IN ROCKLAND TWP.
1100 PM FLOOD OREFIELD 40.64N 75.58W
08/03/2018 LEHIGH PA NEWSPAPER
FLOODING AT AND NEAR THE INTERSECTION OF OREFIELD ROAD
AND COFFEETOWN ROAD.
1200 AM HEAVY RAIN NORTH CATASAUQUA 40.66N 75.47W
08/04/2018 M2.31 INCH NORTHAMPTON PA METEOROLOGIST
DAILY RAINFALL TOTAL FOR AUGUST 3, WITH MOST OCCURRING
WITHIN A TWO-HOUR PERIOD.
0138 AM FLASH FLOOD 1 E SOUTH HEIDELBERG TW 40.31N 76.08W
08/04/2018 BERKS PA SOCIAL MEDIA
A PARTIAL COLLAPSE OF A STRUCTURE OCCURRED AS A RESULT
OF A BASEMENT WALL COLLAPSE FROM FLOOD WATERS.
0216 AM FLOOD CHARLESTOWN HUNT 40.10N 75.53W
08/04/2018 CHESTER PA DEPT OF HIGHWAYS
HEAVY RAINFALL CONTRIBUTED TO A DOWNED TREE ON STATE
HIGHWAY 29 BETWEEN CHARLESTOWN HUNT DRIVE AND BUCKWALTER
ROAD. ALL LANES CLOSED.
0248 AM FLOOD 1 NE PHILLIPSBURG 40.70N 75.17W
08/04/2018 WARREN NJ SOCIAL MEDIA
FLOODING ON U.S. HIGHWAY 22 IN LOPATCONG TWP.
0250 AM FLOOD 1 N CHEROKEE RANCH 40.42N 75.93W
08/04/2018 BERKS PA SOCIAL MEDIA
REPORT OF A VEHICLE STUCK IN FLOOD WATERS ON LEESPORT
AVENUE IN READING.
0316 AM FLOOD FORKS 40.70N 75.23W
08/04/2018 NORTHAMPTON PA SOCIAL MEDIA
STREET FLOODING REPORTED IN FORKS.
0326 AM FLOOD PALMER TWP 40.70N 75.26W
08/04/2018 NORTHAMPTON PA SOCIAL MEDIA
STREET FLOODING REPORTED IN PALMER TWP.
0328 AM FLOOD HARDYSTON TWP 41.10N 74.53W
08/04/2018 SUSSEX NJ DEPT OF HIGHWAYS
HEAVY RAINFALL CONTRIBUTED TO A DOWNED TREE ON STATE
HIGHWAY 23 NORTH OF HOLLAND MOUNTAIN ROAD IN HARDYSTON
TWP.
0356 AM FLOOD HANOVER 40.66N 75.41W
08/04/2018 NORTHAMPTON PA SOCIAL MEDIA
STREET FLOODING REPORTED IN HANOVER.
0357 AM FLOOD PAXINOSA 40.71N 75.19W
08/04/2018 WARREN NJ SOCIAL MEDIA
RIVER ROAD IS FLOODED BETWEEN PHILLIPSBURG AND MARBLE
HILL.
0442 AM FLOOD ZUCKSVILLE 40.72N 75.25W
08/04/2018 NORTHAMPTON PA DEPT OF HIGHWAYS
FLOODING ON BUSHKILL DRIVE BETWEEN STOCKER MILL ROAD
AND KESSLERVILLE ROAD. ALL LANES CLOSED.
0442 AM FLOOD ZUCKSVILLE 40.72N 75.25W
08/04/2018 NORTHAMPTON PA DEPT OF HIGHWAYS
FLOODING ON BUSHKILL DR./13TH ST. IN BOTH DIRECTIONS
BETWEEN STOCKER MILL RD. AND KESSLERVILLE RD. ALL LANES
CLOSED.
0515 AM FLOOD WHITEHALL TWP 40.66N 75.51W
08/04/2018 LEHIGH PA NEWSPAPER
THREE WATER RESCUES CAUSED BY VEHICLES DRIVING PAST
BARRICADES IN WHITEHALL TWP. THESE OCCURRED BETWEEN 515
AM AND 1015 AM.
0519 AM FLOOD 1 WSW WASHINGTON 40.76N 74.99W
08/04/2018 WARREN NJ SOCIAL MEDIA
STREET FLOODING ON WEST WASHINGTON AVENUE IN WASHINGTON
BORO.
0600 AM FLOOD 1 SW BETHLEHEM 40.62N 75.38W
08/04/2018 NORTHAMPTON PA NEWSPAPER
INUNDATION OF SEVERAL MUSIC FESTIVAL VENUES IN
BETHLEHEM AS A RESULT OF FLOODING ON MONOCACY CREEK.
TIME BASED ON RIVER GAUGE REPORTS.
0600 AM FLOOD ALLENTOWN 40.59N 75.48W
08/04/2018 LEHIGH PA NEWSPAPER
SEVERAL ROADS FLOODED IN LEHIGH COUNTY...ESPECIALLY IN
ALLENTOWN. THESE INCLUDE THE INTERSECTION OF ROUTE 309
AND VILLAGE ROAD IN SOUTH WHITEHALL TOWNSHIP...BASIN AND
UNION STREETS NEAR LITTLE LEHIGH CREEK...BATH PIKE IN
EAST ALLEN...AND HAMILTON STREET IN ALLENTOWN.
INUNDATION OF CEDAR CREEK PARK IN ALLENTOWN ALSO
OCCURRED.
0600 AM FLOOD LOWER NAZARETH TWP 40.70N 75.33W
08/04/2018 NORTHAMPTON PA NEWSPAPER
SEVERAL ROADS CLOSED IN NORTHAMPTON COUNTY...INCLUDING
STEUBEN ROAD FROM KEYSTONE DRIVE TO GEORGETOWN ROAD IN
LOWER NAZARETH TOWNSHIP...KESSLERSVILLE ROAD NORTH OF
KUEBLER ROAD IN FORKS TOWNSHIP...AND THE INTERSECTION OF
VAN BUREN AND CORRIERE ROADS IN PALMER TOWNSHIP. TIME
ESTIMATED FROM MEDIA AND LAW ENFORCEMENT REPORTS.
0600 AM FLOOD CATASAUQUA 40.65N 75.46W
08/04/2018 LEHIGH PA NEWSPAPER
FLOODING OF THE CATASAQUA CREEK INUNDATED THE CITY
POOL, FORCING ITS CLOSURE.
0606 AM FLOOD EAST ALLEN TWP 40.71N 75.42W
08/04/2018 NORTHAMPTON PA NEWSPAPER
WATER RESCUES AS A RESULT OF VEHICLES DRIVING PAST
BARRICADES IN EAST ALLEN TOWNSHIP.
0607 AM FLOOD CHAPMAN 40.76N 75.40W
08/04/2018 NORTHAMPTON PA DEPT OF HIGHWAYS
FLOODING ON YOST ROAD BETWEEN MAIN STREET AND ENGLISH
ROAD. ALL LANES CLOSED.
0609 AM FLOOD CHAPMAN 40.76N 75.41W
08/04/2018 NORTHAMPTON PA DEPT OF HIGHWAYS
FLOODING ON YOST RD./5TH ST. BETWEEN MAIN ST. AND
ENGLISH RD. ALL LANES CLOSED.
0700 AM HEAVY RAIN BLAIRSTOWN 40.98N 74.98W
08/04/2018 M2.96 INCH WARREN NJ COCORAHS
11-HOUR TOTAL SINCE 8 PM YESTERDAY.
0700 AM HEAVY RAIN MARTINS CREEK 40.78N 75.19W
08/04/2018 M4.57 INCH NORTHAMPTON PA TRAINED SPOTTER
24-HOUR TOTAL. MARTIN'S CREEK RUNNING HIGH BUT NO
FLOODING.
0720 AM HEAVY RAIN BELVIDERE 40.83N 75.07W
08/04/2018 M3.52 INCH WARREN NJ TRAINED SPOTTER
RAIN FELL OVER A 24-HOUR PERIOD.
0730 AM HEAVY RAIN HIGHLAND LAKES 41.18N 74.47W
08/04/2018 M4.00 INCH SUSSEX NJ TRAINED SPOTTER
24-HOUR TOTAL.
0800 AM HEAVY RAIN NORTHAMPTON 40.68N 75.49W
08/04/2018 M4.75 INCH NORTHAMPTON PA TRAINED SPOTTER
24-HOUR TOTAL.
0800 AM FLASH FLOOD 1 ENE PARSIPPANY-TROY H 40.86N 74.39W
08/04/2018 MORRIS NJ LAW ENFORCEMENT
WATER RESCUE REPORTED ON U.S. HIGHWAY 46 NEAR NORTH
BEVERWYCK ROAD. ADDITIONALLY...WESTBOUND U.S. HIGHWAY 46
EXIT TO WATERVIEW BOULEVARD WAS CLOSED FROM A
CONSTRUCTION SITE DEBRIS FLOW. EDWARDS ROAD WAS CLOSED
BETWEEN U.S. HIGHWAY 46 AND NEW ROAD. TIME APPROXIMATED
BASED ON MEDIA AND LAW ENFORCEMENT REPORTS.
0800 AM FLOOD 1 NNW ANCIENT OAKS 40.54N 75.59W
08/04/2018 LEHIGH PA SOCIAL MEDIA
FLOODING OF SPRING CREEK ROAD AND RESIDENTIAL STREETS
NEAR LITTLE LEHIGH CREEK IN LOWER MACUNGIE TWP. VIDEO ON
SOCIAL MEDIA SHOWS WATER REACHING THE WINDSHIELD OF A
CAR PARKED ON SPRING CREEK ROAD ADJACENT TO LITTLE
LEHIGH CREEK.
0838 AM FLOOD CLYDE 40.71N 75.39W
08/04/2018 NORTHAMPTON PA DEPT OF HIGHWAYS
FLOODING ON PA 512 IN BOTH DIRECTIONS BETWEEN JAINDL
BLVD. AND SILVER CREST RD. ALL LANES CLOSED.
0840 AM FLOOD 1 NW PARSIPPANY-TROY HI 40.87N 74.41W
08/04/2018 MORRIS NJ DEPT OF HIGHWAYS
FLOODING ON US 46 IN BOTH DIRECTIONS EAST OF I-287. ALL
LANES CLOSED AND DETOURED.
0903 AM HEAVY RAIN GERMANSVILLE 40.70N 75.71W
08/04/2018 M3.07 INCH LEHIGH PA TRAINED SPOTTER
STORM TOTAL RAINFALL.
0930 AM FLOOD NORTH PLAINFIELD 40.62N 74.44W
08/04/2018 SOMERSET NJ LAW ENFORCEMENT
MULTIPLE VEHICLES STUCK IN HIGH WATER.
1008 AM FLOOD 1 NNE ANCIENT OAKS 40.54N 75.58W
08/04/2018 LEHIGH PA TRAINED SPOTTER
FLOODING ALONG THE LITTLE LEHIGH CREEK NEAR SPRING
CREEK AND LOWER MACUNGIE ROADS.
1009 AM HEAVY RAIN HIGHLAND LAKES 41.18N 74.47W
08/04/2018 M4.30 INCH SUSSEX NJ PUBLIC
24-HOUR TOTAL.
1050 AM FLOOD MAIDEN CREEK 40.45N 75.90W
08/04/2018 BERKS PA TRAINED SPOTTER
FLOODING ON ROADWAYS IN AND AROUND BLANDON/MAIDENCREEK
TOWNSHIP.
1100 AM FLOOD 1 ENE ALPHANO 40.90N 74.85W
08/04/2018 WARREN NJ TRAINED SPOTTER
FLOODING FROM A LAKE ON THE PANTHER VALLEY GOLF COURSE.
1130 AM FLOOD BETHLEHEM 40.63N 75.38W
08/04/2018 NORTHAMPTON PA SOCIAL MEDIA
PHOTO SHOWS RIVER FLOODING AT THE MUSIKFEST STREET
FAIR. THIS IS NOT CONFIRMED AT THIS TIME.
1238 PM FLOOD MUTCHLERTOWN 40.67N 75.24W
08/04/2018 NORTHAMPTON PA DEPT OF HIGHWAYS
FLOODING ON LARRY HOLMES DR./IRON ST./KEYSTONE
ST./LEHIGH DR./WASHINGTON ST. IN BOTH DIRECTIONS BETWEEN
LEHIGH DR./HUGH MOORE PARK RD. AND 4TH ST./WASHINGTON
ST. ALL LANES CLOSED.
0714 PM FLOOD 2 NNE CEDARVILLE 40.25N 75.66W
08/04/2018 MONTGOMERY PA TRAINED SPOTTER
FLOODING ON MANATAWNY STREET AND COLLEGE DRIVE AS A
RESULT OF THE SCHUYLKILL RIVER OVERFLOWING ITS BANKS.
0232 AM HEAVY RAIN NORTH CATASAUQUA 40.66N 75.47W
08/05/2018 M5.86 INCH NORTHAMPTON PA METEOROLOGIST
TWO-DAY RAINFALL TOTAL.
&&
EVENT NUMBER PHI1801178 PHI1801171 PHI1801172 PHI1801173 PHI1801174
PHI1801181 PHI1801175 PHI1801176 PHI1801218 PHI1801177 PHI1801179
PHI1801180 PHI1801183 PHI1801182 PHI1801185 PHI1801186 PHI1801188
PHI1801187 PHI1801184 PHI1801189 PHI1801205 PHI1801213 PHI1801190
PHI1801210 PHI1801212 PHI1801214 PHI1801217 PHI1801211 PHI1801191
PHI1801204 PHI1801194 PHI1801201 PHI1801192 PHI1801193 PHI1801202
PHI1801209 PHI1801216 PHI1801207 PHI1801208 PHI1801203 PHI1801195
PHI1801197 PHI1801196 PHI1801198 PHI1801199 PHI1801200 PHI1801206
PHI1801215 PHI1801219
$$
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