Overview
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A deepening area of low pressure moved from the Upper Midwest, through the Great Lakes, and into southern Ontario on November 15, 2020. Ahead of this intense low, a warm front lifted through the mid-Atlantic during the late morning and early afternoon hours. Strong southerly flow developed over the region during the afternoon and evening, in the gradient between the low pressure to the northwest and an offshore high pressure center. This resulted in an unseasonably warm day for November with most areas achieving high temperatures in the low to mid 60s and dew point values also approaching 60F. This caused a small amount (no more than 100 to 200J/kg) of MLCAPE to develop. Meanwhile, extreme wind fields were present with 0 to 6km shear of 90 to 110 kt. This exceptional shear combined with strong lift from an approaching cold front and the small amount of instability caused a squall line to develop immediately ahead of the cold front. The line was narrow and low-topped and produced little lightning, typical of strongly forced, high shear, low CAPE environments such as this one. However, the intense low level wind fields caused this squall line to become a widespread wind damage producer. Ahead of the line, non-convective winds associated with the strong gradient were already gusting over 40 mph in some areas and producing sporadic minor damage. Along the squall line, many locations saw wind gusts of 55 to 65 mph, producing more widespread tree and utility damage. A couple areas of enhanced damage also occurred, likely associated with rear-flank downdraft surges from multiple small-scale circulations which developed along the line. No evidence of tornadic damage was found. Thankfully, no injuries were attributed to this event. |
 KDIX radar loop at half hour intervals of the 15 November 2020 squall line. |
Synoptic Overview at 12z 15 Nov 2020 (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 16 Nov 2020 (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: 12z surface map | Figure 14: 15z surface map | Figure 15: 18z surface map |
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| Figure 16: 21z surface map | Figure 17: 00z surface map | Figure 18: 03z surface map |
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| Figure 19: 12z Nov 15 Pittsburgh, PA sounding | Figure 20: 12z Nov 15 Sterling, VA sounding | Figure 21: 12z Nov 15 Wallops Island, VA sounding |
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| Figure 22: 00z Nov 16 Wallops Island, VA sounding | Figure 23: 00z Nov 16 Sterling, VA sounding | Figure 24: 00z Nov 16 Islip, NY sounding |
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| Figure 1: National Preliminary Storm Reports 12z 15 Nov 2020 to 12z 16 Nov 2020 | 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 15 Nov 2020 event.
NWUS51 KPHI 160622
LSRPHI
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
122 AM EST MON NOV 16 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 PM TSTM WND DMG 1 SW WEATHERLY 40.93N 75.85W
11/15/2020 CARBON PA UTILITY COMPANY
DOWNED TREE IN WIRES NEAR BRENKMAN DRIVE.
TIME ESTIMATED FROM RADAR.
0630 PM TSTM WND DMG CENTRE TWP 40.47N 76.03W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON IRISH CREEK ROAD NEAR
BELLEMANS CHURCH ROAD. TIME ESTIMATED FROM
RADAR.
0633 PM TSTM WND GST 1 WNW HAMBURG 40.56N 76.01W
11/15/2020 M62 MPH BERKS PA TRAINED SPOTTER
IN THE LOWES PARKING LOT, MEASURED WITH A
KESTREL 5000. POWER FLASHES OBSERVED.
0635 PM TSTM WND GST BERN TWP 40.39N 76.00W
11/15/2020 E60 MPH BERKS PA TRAINED SPOTTER
DOWNED TREE LIMBS IN THE AREA.
0639 PM TSTM WND DMG 2 SE SHILLINGTON 40.29N 75.95W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE AND WIRES NEAR CHURCH ROAD AND
NEW HOLLAND ROAD. TIME ESTIMATED FROM RADAR.
0639 PM TSTM WND GST READING REGIONAL AIRPOR 40.38N 75.97W
11/15/2020 M51 MPH BERKS PA ASOS
0640 PM TSTM WND DMG 1 NNW BLANDON 40.45N 75.89W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED POLE AND WIRES NEAR SPIRIT COURT AND
PARK ROAD. TIME ESTIMATED FROM RADAR.
0641 PM TSTM WND DMG LYNN TWP 40.68N 75.80W
11/15/2020 LEHIGH PA 911 CALL CENTER
TREE DOWN WITH POWER OUTAGE. TIME ESTIMATED.
0642 PM TSTM WND DMG 2 SW EAST PENN TWP 40.75N 75.76W
11/15/2020 CARBON PA UTILITY COMPANY
DOWNED TREE IN WIRES NEAR GERMANS ROAD. TIME
ESTIMATED FROM RADAR.
0642 PM TSTM WND DMG 1 S RUSCOMBMANOR TWP 40.42N 75.82W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE AND WIRES NEAR MEMORIAL HIGHWAY
AND ERHARDT ROAD. TIME ESTIMATED FROM RADAR.
0644 PM TSTM WND DMG SHILLINGTON 40.30N 75.97W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON A CAR ON MADISON STREET. TIME
ESTIMATED FROM RADAR.
0644 PM TSTM WND DMG 2 SW OLEY 40.37N 75.82W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON FRIEDENSBERG ROAD. TIME
ESTIMATED FROM RADAR.
0644 PM TSTM WND DMG 2 W LORANE 40.29N 75.88W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON SEYFERT DRIVE. TIME ESTIMATED
FROM RADAR.
0645 PM TSTM WND DMG GERMANSVILLE 40.70N 75.71W
11/15/2020 LEHIGH PA TRAINED SPOTTER
13 INCH DIAMETER TREE LIMB DOWNED. TIME
ESTIMATED FROM RADAR.
0645 PM TSTM WND DMG 1 NNE EXETER TWP 40.33N 75.83W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE AND WIRES ON STONEHENGE DRIVE.
TIME ESTIMATED FROM RADAR.
0645 PM TSTM WND DMG 3 WNW ROBESON TWP 40.26N 75.92W
11/15/2020 BERKS PA PUBLIC
DOWNED TREE AND WIRES NEAR MORGANTOWN ROAD.
TIME ESTIMATED FROM RADAR.
0646 PM TSTM WND DMG 3 W EMERALD 40.75N 75.69W
11/15/2020 LEHIGH PA UTILITY COMPANY
DOWNED TREE IN WIRES NEAR FURNACE ROAD. TIME
ESTIMATED FROM RADAR.
0646 PM TSTM WND DMG 3 ENE KUTZTOWN 40.54N 75.73W
11/15/2020 BERKS PA PUBLIC
MPING REPORT OF TREES AND WIRES DOWN IN THIS
AREA. TIME ESTIMATED FROM RADAR.
0648 PM TSTM WND DMG 3 NNW TOPTON 40.55N 75.71W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED WIRES ON KUNKLE ROAD. TIME ESTIMATED
FROM RADAR.
0652 PM TSTM WND DMG 1 WNW EARL TWP 40.37N 75.71W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE NEAR WEST PHILADELPHIA AVENUE
AND SCHOOL HOUSE ROAD. TIME ESTIMATED FROM
RADAR.
0653 PM TSTM WND DMG 4 NNW AMITY GARDENS 40.33N 75.76W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON WIRES NEAR COVERED BRIDGE
ROAD AND MEMORIAL HIGHWAY IN OLEY TWP. TIME
ESTIMATED FROM RADAR.
0654 PM TSTM WND DMG 1 SSW EARL TWP 40.35N 75.70W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE ON SUNSET HILL ROAD. TIME
ESTIMATED FROM RADAR.
0656 PM TSTM WND DMG 2 WSW POCONO SUMMIT 41.10N 75.41W
11/15/2020 MONROE PA FIRE DEPT/RESCUE
DOWNED TREE ON SULLIVAN TRAIL NEAR LONG POND
ROAD. TIME ESTIMATED FROM RADAR.
0656 PM TSTM WND DMG 1 S EARL TWP 40.34N 75.69W
11/15/2020 BERKS PA FIRE DEPT/RESCUE
DOWNED TREE NEAR THE INTERSECTION OF LAUREL
ROAD AND PINE ROAD. TIME ESTIMATED FROM
RADAR.
0658 PM TSTM WND DMG 3 SW ALLENTOWN 40.57N 75.52W
11/15/2020 LEHIGH PA UTILITY COMPANY
REPORTS OF DOWNED TREES AND WIRES NEAR
LINDBERG AVENUE. TIME ESTIMATED FROM RADAR.
0659 PM TSTM WND DMG KUNKLETOWN 40.85N 75.45W
11/15/2020 MONROE PA TRAINED SPOTTER
SEVERAL DOWNED TREES IN THE AREA. TIME BASED
ON OBSERVED WIND GUSTS.
0700 PM TSTM WND DMG KUNKLETOWN 40.85N 75.44W
11/15/2020 MONROE PA UTILITY COMPANY
DOWNED TREE IN WIRES NEAR FIDDLETOWN ROAD.
TIME ESTIMATED FROM RADAR.
0700 PM TSTM WND DMG 1 WSW NORTHAMPTON 40.68N 75.50W
11/15/2020 LEHIGH PA PUBLIC
MPING REPORT OF TREE LIMBS DOWN. TIME
ESTIMATED FROM RADAR.
0702 PM TSTM WND GST WHITEHALL TWP 40.63N 75.47W
11/15/2020 M53 MPH LEHIGH PA PUBLIC
0704 PM TSTM WND DMG 2 SSE ZIONSVILLE 40.46N 75.50W
11/15/2020 LEHIGH PA 911 CALL CENTER
TREE DOWN INTO A VEHICLE, NO INJURIES OR
ENTRAPMENT. TIME ESTIMATED.
0705 PM TSTM WND DMG SALISBURY TWP 40.59N 75.43W
11/15/2020 LEHIGH PA 911 CALL CENTER
TREE DOWN INTO WIRES, STILL ENERGIZED. TIME
ESTIMATED.
0706 PM TSTM WND DMG 3 WNW PERKIOMENVILLE 40.35N 75.54W
11/15/2020 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE ON LAYFIELD ROAD NEAR DEEP CREEK
ROAD. TIME ESTIMATED FROM RADAR.
0708 PM TSTM WND DMG 3 SSW COOPERSBURG 40.48N 75.41W
11/15/2020 BUCKS PA UTILITY COMPANY
DOWNED TREE IN WIRES NEAR GRANT ROAD. TIME
ESTIMATED FROM RADAR.
0710 PM TSTM WND DMG 2 ENE CENTER VALLEY 40.54N 75.35W
11/15/2020 LEHIGH PA PUBLIC
MPING REPORT OF TREES UPROOTED OR SNAPPED.
TIME ESTIMATED FROM RADAR.
0712 PM TSTM WND DMG 1 NE WIND GAP 40.86N 75.28W
11/15/2020 NORTHAMPTON PA TRAINED SPOTTER
SEVERAL LARGE TREES AND LIMBS DOWN IN THE
AREA. TIME ESTIMATED FROM RADAR.
0712 PM TSTM WND DMG 1 NNE ARLINGTON HEIGHTS 41.01N 75.20W
11/15/2020 MONROE PA FIRE DEPT/RESCUE
DOWNED TREE ON CHRISTOPHER STREET NEAR NORTH
5TH STREET. TIME ESTIMATED FROM RADAR.
0712 PM TSTM WND DMG 1 WNW CEDARVILLE 40.23N 75.69W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON SCHOLL ROAD NEAR WEST
SCHUYLKILL ROAD. TIME ESTIMATED FROM RADAR.
0714 PM TSTM WND DMG BUSHKILL TWP 40.81N 75.33W
11/15/2020 NORTHAMPTON PA TRAINED SPOTTER
TREES AND WIRES DOWN IN BUSHKILL TOWNSHIP.
0714 PM TSTM WND DMG 3 ESE SKYTOP 41.21N 75.19W
11/15/2020 MONROE PA UTILITY COMPANY
DOWNED TREE IN WIRES NEAR BROWNS LAKE DRIVE.
TIME ESTIMATED FROM RADAR.
0714 PM TSTM WND DMG 2 N WALLACE TWP 40.12N 75.78W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON LITTLE CONESTOGA ROAD NEAR
MAPLEFLOWER ROAD. TIME ESTIMATED FROM RADAR.
0715 PM TSTM WND DMG 3 SE BALLY 40.38N 75.55W
11/15/2020 MONTGOMERY PA COUNTY OFFICIAL
DOWNED POWER POLES AND LINES NEAR WEST
BRANCH ROAD AND WILD RUN ROAD. TIME
ESTIMATED FROM RADAR.
0716 PM TSTM WND DMG PEN ARGYL 40.87N 75.26W
11/15/2020 NORTHAMPTON PA TRAINED SPOTTER
TREES AND WIRES DOWN IN PENN ARGYL BOROUGH.
0717 PM TSTM WND DMG WASHINGTON TWP 40.84N 75.21W
11/15/2020 NORTHAMPTON PA TRAINED SPOTTER
TREES AND WIRES DOWN IN WASHINGTON TOWNSHIP.
0718 PM TSTM WND DMG 2 S TATAMY 40.72N 75.26W
11/15/2020 NORTHAMPTON PA PUBLIC
MPING REPORT OF TREE LIMBS DOWN. TIME
ESTIMATED FROM RADAR.
0718 PM TSTM WND DMG 1 ESE BRANDAMORE 40.05N 75.80W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE NEAR CULBERTSON RUN ROAD. TIME
ESTIMATED FROM RADAR.
0722 PM TSTM WND DMG 2 N EAST ROCKHILL TWP 40.43N 75.27W
11/15/2020 BUCKS PA PUBLIC
MPING REPORT OF DOWNED TREE LIMBS. TIME
ESTIMATED FROM RADAR.
0724 PM TSTM WND DMG 1 NE CALN TWP 40.01N 75.75W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREES AND WIRES NEAR THE ROUTE 30
BYPASS NEAR ROUTE 340 AND BONDSVILLE ROAD.
TIME ESTIMATED FROM RADAR.
0724 PM TSTM WND DMG 2 WNW SPRING CITY 40.19N 75.58W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON SCHUYLKILL ROAD NEAR REITNOUR
ROAD. TIME ESTIMATED FROM RADAR.
0726 PM TSTM WND DMG 3 NW EAST CALN TWP 40.05N 75.71W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON LONGFIELDS WAY NEAR DORLAN
MILL ROAD. TIME ESTIMATED FROM RADAR.
0726 PM TSTM WND DMG BLAIRSTOWN 40.98N 74.99W
11/15/2020 WARREN NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE AREA. TIME ESTIMATED FROM RADAR.
0726 PM TSTM WND DMG BLOOMSBURY 40.66N 75.08W
11/15/2020 HUNTERDON NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE AREA. TIME ESTIMATED FROM RADAR.
0728 PM TSTM WND DMG 1 NNW HOPE 40.93N 74.98W
11/15/2020 WARREN NJ PUBLIC
MPING REPORT OF TREES AND POWER POLES DOWN.
TIME ESTIMATED FROM RADAR.
0736 PM TSTM WND DMG 1 SW EAGLEVILLE 40.15N 75.43W
11/15/2020 MONTGOMERY PA TRAINED SPOTTER
TREE DOWN ON EAGLEVILLE ROAD. TIME
ESTIMATED.
0736 PM TSTM WND DMG 2 S EAST WHITELAND TWP 40.03N 75.56W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON FRAZER ROAD NEAR KING ROAD.
TIME ESTIMATED FROM RADAR.
0739 PM TSTM WND GST STEWARTSVILLE 40.69N 75.11W
11/15/2020 M58 MPH WARREN NJ TRAINED SPOTTER
CORRECTS PREVIOUS TSTM WND GST REPORT FROM
STEWARTSVILLE.
0740 PM TSTM WND DMG 1 ENE PAOLI 40.05N 75.47W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON BEARHILL ROAD NEAR EAST
CENTRAL AVENUE. TIME ESTIMATED FROM RADAR.
0740 PM TSTM WND DMG 2 WNW FRICKS 40.31N 75.28W
11/15/2020 BUCKS PA UTILITY COMPANY
DOWNED TREE IN WIRES NEAR KEYSTONE DRIVE.
TIME ESTIMATED FROM RADAR.
0741 PM TSTM WND DMG 1 NNW BRIDGEPORT 40.12N 75.35W
11/15/2020 MONTGOMERY PA TRAINED SPOTTER
ROOF PARTIALLY BLOWN OFF OF A BUILDING IN
NORRISTOWN. TIME ESTIMATED.
0744 PM TSTM WND DMG 2 NE BERWYN 40.07N 75.41W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON BERKSHIRE ROAD NEAR PUGH
ROAD. TIME ESTIMATED FROM RADAR.
0744 PM TSTM WND DMG 2 ESE VALLEY FORGE 40.09N 75.43W
11/15/2020 CHESTER PA COUNTY OFFICIAL
DOWNED TREE ON RICHARDS ROAD NEAR THOMAS
ROAD. TIME ESTIMATED FROM RADAR.
0745 PM NON-TSTM WND GST 1 SSW RUSCOMBMANOR TWP 40.41N 75.83W
11/15/2020 M58 MPH BERKS PA MESONET
GUST OCCURRED WELL AFTER CONVECTION MOVED
THROUGH THE AREA.
0750 PM TSTM WND DMG 1 E NEWTOWN SQUARE 39.99N 75.38W
11/15/2020 DELAWARE PA PUBLIC
MPING REPORT OF DOWNED TREE LIMBS AND WIRES.
TIME ESTIMATED FROM RADAR.
0750 PM TSTM WND DMG HAMBURG 41.15N 74.58W
11/15/2020 SUSSEX NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE AREA. TIME ESTIMATED FROM RADAR.
0752 PM TSTM WND DMG WEST CONSHOHOCKEN 40.07N 75.31W
11/15/2020 MONTGOMERY PA COUNTY OFFICIAL
SEVERAL REPORTS OF DOWNED TREE LIMBS IN
LOWER MERION TWP. TIME ESTIMATED FROM RADAR.
0754 PM TSTM WND DMG FORT WASHINGTON 40.15N 75.22W
11/15/2020 MONTGOMERY PA COUNTY OFFICIAL
DOWNED TREE AND WIRES ON AMBLER ROAD NEAR
ELLERSLIE AVENUE. TIME ESTIMATED FROM RADAR.
0754 PM TSTM WND DMG GREEN RIDGE 39.87N 75.42W
11/15/2020 DELAWARE PA PUBLIC
MPING REPORT OF TREE LIMBS DOWN. TIME
ESTIMATED FROM RADAR.
0755 PM TSTM WND GST 4 SW WANTAGE 41.24N 74.65W
11/15/2020 M47 MPH SUSSEX NJ TRAINED SPOTTER
POWER OUTAGES REPORTED IN THE AREA.
0755 PM TSTM WND DMG NEWARK 39.68N 75.76W
11/15/2020 NEW CASTLE DE DEPT OF HIGHWAYS
DOWNED POLES CLOSING FRENCH ROAD NEAR FRAZER
ROAD AND PERCH CREEK ROAD IN NEWARK. TIME
ESTIMATED FROM RADAR.
0758 PM TSTM WND DMG FAR HILLS 40.69N 74.64W
11/15/2020 SOMERSET NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE AREA. TIME ESTIMATED FROM RADAR.
0758 PM TSTM WND DMG 1 NNE HOLIDAY HILLS 39.82N 75.50W
11/15/2020 NEW CASTLE DE DEPT OF HIGHWAYS
NAAMANS ROAD NEAR FOULK ROAD IS CLOSED DUE
TO DOWNED WIRES, TIME ESTIMATED FROM RADAR.
0800 PM TSTM WND DMG WILLOW GROVE 40.15N 75.12W
11/15/2020 MONTGOMERY PA TRAINED SPOTTER
SEVERAL TREES DOWN IN THE AREA. TIME
ESTIMATED FROM RADAR.
0800 PM TSTM WND DMG 1 ENE WILLOW GROVE 40.15N 75.10W
11/15/2020 MONTGOMERY PA COUNTY OFFICIAL
DOWNED LARGE TREE LIMB BROUGHT WIRES DOWN
ONTO TERWOOD ROAD. TIME ESTIMATED FROM
RADAR.
0800 PM TSTM WND GST 2 SW VERNON 41.18N 74.50W
11/15/2020 M62 MPH SUSSEX NJ MESONET
VERNON TWP NJWXNET GAUGE.
0802 PM TSTM WND DMG 1 S BELMONT 39.95N 75.20W
11/15/2020 PHILADELPHIA PA PUBLIC
MPING REPORT OF TREE LIMBS DOWN. TIME
ESTIMATED FROM RADAR.
0805 PM TSTM WND GST LOWER ALLOWAYS CREEK 39.48N 75.54W
11/15/2020 M60 MPH SALEM NJ PUBLIC
NJ WEATHER NET SITE NJ74.
0805 PM TSTM WND GST 1 W LOGAN TWP. 39.80N 75.37W
11/15/2020 M55 MPH GLOUCESTER NJ MESONET
LOGAN TWP NJWXNET GAUGE.
0806 PM TSTM WND DMG 1 SSW PHILADELPHIA 39.94N 75.16W
11/15/2020 PHILADELPHIA PA PUBLIC
MPING REPORT OF DOWNED TREE LIMBS. TIME
ESTIMATED FROM RADAR.
0808 PM TSTM WND DMG 1 SW MADISON 40.74N 74.43W
11/15/2020 MORRIS NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE AREA. TIME ESTIMATED FROM RADAR.
0810 PM TSTM WND DMG TACONY 40.03N 75.05W
11/15/2020 PHILADELPHIA PA PUBLIC
MPING REPORT OF TREES AND POWER POLES DOWN.
TIME ESTIMATED FROM RADAR.
0810 PM TSTM WND DMG 1 NW MADISON 40.77N 74.43W
11/15/2020 MORRIS NJ DEPT OF HIGHWAYS
DOWNED TREE ON NJ124 EASTBOUND DANFORTH
ROAD, ONE LANE CLOSED. TIME ESTIMATED FROM
RADAR.
0810 PM TSTM WND GST 2 SSW PALMYRA 39.98N 75.04W
11/15/2020 M44 MPH CAMDEN NJ MESONET
CORRECTS PREVIOUS TSTM WND GST REPORT FROM 2
SSW PALMYRA. PENNSAUKEN NJWXNET GAUGE.
0812 PM TSTM WND DMG 1 NNW WATCHUNG 40.65N 74.46W
11/15/2020 SOMERSET NJ PUBLIC
MPING REPORT OF TREE LIMBS DOWN. TIME
ESTIMATED FROM RADAR.
0814 PM TSTM WND DMG TOWACO 40.93N 74.34W
11/15/2020 MORRIS NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE AREA. TIME ESTIMATED FROM RADAR.
0814 PM TSTM WND DMG 2 NW WASHINGTON CROSSIN 40.31N 74.89W
11/15/2020 MERCER NJ DEPT OF HIGHWAYS
DOWNED POLE AND DOWNED WIRES ON NJ 29
SOUTHBOUND AREA RIVER ROAD. ALL LANES
CLOSED. TIME ESTIMATED FROM RADAR.
0818 PM TSTM WND DMG MULLICA HILL 39.74N 75.22W
11/15/2020 GLOUCESTER NJ PUBLIC
MPING REPORT OF TREES AND POWER LINES DOWN.
TIME ESTIMATED FROM RADAR.
0820 PM TSTM WND DMG 2 NNE MERCHANTVILLE 39.97N 75.04W
11/15/2020 CAMDEN NJ DEPT OF HIGHWAYS
DOWNED TREE ON US 130 SOUTHBOUND RAMP FROM
NJ 90 (PENNSAUKEN). ALL LANES CLOSED. TIME
ESTIMATED FROM RADAR.
0822 PM TSTM WND GST NORTHEAST PHILADELPHIA 40.08N 75.01W
11/15/2020 M56 MPH PHILADELPHIA PA ASOS
KPNE.
0822 PM TSTM WND DMG NEW BRUNSWICK 40.49N 74.44W
11/15/2020 MIDDLESEX NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREE LIMBS AND
WIRES IN THE AREA. TIME ESTIMATED FROM
RADAR.
0823 PM TSTM WND DMG 1 E SOMERSET 40.50N 74.51W
11/15/2020 SOMERSET NJ TRAINED SPOTTER
SPOTTER REPORTS AN OUTDOOR CANOPY SHREDDED
AND ADDITIONAL OUTDOOR FURNITURE DISPLACED.
TIME ESTIMATED FROM RADAR.
0824 PM TSTM WND GST 1 ENE WESTAMPTON TWP 40.01N 74.82W
11/15/2020 E60 MPH BURLINGTON NJ NWS EMPLOYEE
NWS METEOROLOGISTS ESTIMATED 60 MPH WINDS
WITH SQUALL PASSAGE.
0824 PM TSTM WND GST 1 NE MASSEY 39.32N 75.81W
11/15/2020 M62 MPH KENT MD PUBLIC
WEATHER UNDERGROUND SITE KMDMASSE2.
0830 PM TSTM WND GST 2 SW RANCOCAS 39.98N 74.90W
11/15/2020 M42 MPH BURLINGTON NJ MESONET
CORRECTS PREVIOUS TSTM WND GST REPORT FROM 2
SW RANCOCAS. MOORESTOWN NJWXNET GAUGE.
0830 PM TSTM WND GST 2 SE JACKSONVILLE 40.03N 74.73W
11/15/2020 M43 MPH BURLINGTON NJ MESONET
CORRECTS PREVIOUS TSTM WND GST REPORT FROM 2
SE JACKSONVILLE. COLUMBUS NJWXNET GAUGE.
0832 PM TSTM WND GST PORT READING 40.57N 74.24W
11/15/2020 M60 MPH MIDDLESEX NJ TRAINED SPOTTER
TRAINED SPOTTER REPORTS WIND GUST OF 60 MPH
AT PORT READING.
0840 PM TSTM WND GST MCGUIRE AFB (KWRI) 40.02N 74.59W
11/15/2020 M58 MPH BURLINGTON NJ AWOS
0846 PM TSTM WND GST KEYPORT 40.44N 74.20W
11/15/2020 M49 MPH MONMOUTH NJ TRAINED SPOTTER
0848 PM TSTM WND DMG 2 ESE FREEHOLD TWP 40.22N 74.26W
11/15/2020 MONMOUTH NJ PUBLIC
REPORTS OF DOWNED TREES AND POWER LINES IN
THE FREEHOLD AND ADELPHIA AREAS. TIME
ESTIMATED FROM RADAR.
0854 PM TSTM WND GST MANTOLOKING 40.04N 74.05W
11/15/2020 M59 MPH ANZ451 NJ MESONET
HADS SENSOR. GUST WAS IN ADVANCE OF THE
CONVECTION.
0855 PM TSTM WND GST HARRINGTON 38.92N 75.57W
11/15/2020 M48 MPH KENT DE MESONET
DEOS GAUGE AT HARRINGTON.
0900 PM TSTM WND DMG 1 E LAKEWOOD 40.08N 74.15W
11/15/2020 OCEAN NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREE LIMBS AND
WIRES IN THE AREA. TIME ESTIMATED FROM
RADAR.
0900 PM TSTM WND DMG 3 W WANAMASSA 40.23N 74.08W
11/15/2020 MONMOUTH NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREE LIMBS AND
POWER LINES IN THE ASBURY PARK, DEAL, AND
NEPTUNE CITY AREAS. TIME ESTIMATED FROM
RADAR.
0900 PM TSTM WND GST 3 SW MULLICA TWP 39.55N 74.73W
11/15/2020 M55 MPH ATLANTIC NJ MESONET
MULLICA TWP NJWXNET GAUGE.
0906 PM TSTM WND DMG POINT PLEASANT 40.07N 74.07W
11/15/2020 OCEAN NJ UTILITY COMPANY
DOWNED TREE LIMBS AND WIRES IN THE AREA.
TIME ESTIMATED FROM RADAR.
0906 PM TSTM WND DMG TOMS RIVER 39.95N 74.19W
11/15/2020 OCEAN NJ UTILITY COMPANY
SEVERAL REPORTS OF DOWNED TREES AND WIRES IN
THE AREA. TIME ESTIMATED FROM RADAR.
0909 PM TSTM WND GST BRICK 40.01N 74.06W
11/15/2020 M63 MPH OCEAN NJ MESONET
WEATHERFLOW GAUGE.
0914 PM TSTM WND GST 1 SSW HARVEY CEDARS 39.69N 74.14W
11/15/2020 M65 MPH OCEAN NJ PUBLIC
WEATHER UNDERGROUND SITE KNJLONGB85.
0916 PM TSTM WND GST BRICK 40.01N 74.06W
11/15/2020 M56 MPH OCEAN NJ TRAINED SPOTTER
0918 PM TSTM WND DMG 1 SW LACEY TWP 39.85N 74.22W
11/15/2020 OCEAN NJ DEPT OF HIGHWAYS
DOWNED TREE ON GARDEN STATE PARKWAY NEAR
EXIT 74 (LACEY TOWNSHIP). 1 LANE BLOCKED.
TIME ESTIMATED FROM RADAR.
0920 PM TSTM WND DMG WEST CREEK 39.64N 74.30W
11/15/2020 OCEAN NJ PUBLIC
A TREE WAS UPROOTED IN WEST CREEK. REPORT
VIA SOCIAL MEDIA WITH A PHOTO. TIME
ESTIMATED FROM RADAR.
0921 PM TSTM WND GST 4 SE MYSTIC ISLAND 39.52N 74.32W
11/15/2020 M58 MPH OCEAN NJ MESONET
WEATHERFLOW GAUGE.
0924 PM TSTM WND GST 3 SSW BEACH HAVEN 39.53N 74.26W
11/15/2020 M59 MPH OCEAN NJ PUBLIC
WEATHER UNDERGROUND SITE KNJLONGB59.
0926 PM TSTM WND GST 2 SW BEACH HAVEN 39.54N 74.26W
11/15/2020 M58 MPH OCEAN NJ MESONET
0927 PM MARINE TSTM WIND 1 SW NORTH CAPE MAY 38.97N 74.97W
11/15/2020 M56 MPH ANZ431 NJ MESONET
WEATHERFLOW SITE XMAY.
0930 PM TSTM WND GST 1 NW BARNEGAT LIGHT 39.77N 74.12W
11/15/2020 M61 MPH OCEAN NJ MESONET
WEATHERFLOW GAUGE.
0930 PM TSTM WND GST 1 SSW NORTH CAPE MAY 38.97N 74.96W
11/15/2020 M65 MPH CAPE MAY NJ OTHER FEDERAL
NOS GAUGE CMAN4.
0930 PM MARINE TSTM WIND BARNEGAT LIGHT 39.76N 74.11W
11/15/2020 M61 MPH ANZ451 NJ MESONET
WEATHERFLOW GAUGE.
0934 PM TSTM WND DMG 1 NNE WILDWOOD 39.00N 74.82W
11/15/2020 CAPE MAY NJ AMATEUR RADIO
MULTIPLE REPORTS OF POWER OUTAGES WITH BLOWN
TRANSFORMERS INCLUDING NEAR WILDWOOD
SCHOONER ISLAND MARINA AND LIGHT HOUSE
MARINA.
0953 PM TSTM WND GST 4 SE MYSTIC ISLAND 39.52N 74.32W
11/15/2020 M62 MPH OCEAN NJ MESONET
WEATHERFLOW GAUGE.
&&
$$
NOUS41 KPHI 162159 PNSPHI PAZ054-055-060>062-070-071-101>106-171000- PUBLIC INFORMATION STATEMENT National Weather Service MOUNT HOLLY NJ 459 PM EST Mon Nov 16 2020 ...NWS DAMAGE SURVEY FOR NOVEMBER 15 2020 THUNDERSTORM WIND EVENT... Location...Maxatawny Township in Berks County PA Date...November 15, 2020 Estimated Time...6:48 PM EST to 6:51 PM EST Estimated Maximum Wind Speed...80 mph Maximum Path Width...150 yards Path Length...1.8 miles Beginning Lat/Lon...40.5445/-75.7155 Ending Lat/Lon...40.5585/-75.6859 * Fatalities...0 * Injuries...0 ...Summary... An NWS storm survey was conducted on a severe straight-line wind event which occurred on Sunday evening in Maxatawny Township in Berks County PA about 4 miles ENE of Kutztown. A severe surge of winds began along Kunkel Road where substantial damage occurred to a single family home and the surrounding property. Several trees were snapped or uprooted and yard toys were tossed up to 200 yards away from the property. The winds partially lifted the front porch roof, but did not completely blow it off the house. The winds swept across nearby fields and struck a large barn, uprooting and snapping a few more trees along the way. The barn was almost completely destroyed, suffering outer wall collapse and partial roof removal. A few trees around the barn were also uprooted or snapped and a nearby shed was tossed off its foundation and completely destroyed. Some minor cosmetic damage occurred to the adjacent farm home. Nearby fields were strewn with tree and structural debris as well as debris from the yard toys. The winds continued across a rural area for about another 1.5 miles sweeping across fields and snapping trees along the way. Most notably, a line of trees near Grim Road over 100 yards in width were all snapped. Some unharvested, dead corn fields along Albright Road suffered large swaths of blown over corn stalks. A home near the downed field of corn stalks suffered some minor cosmetic damage. The surge of winds ended near a farm on Route 863 where a barn roof was partially removed and a tree was snapped. The National Weather Service in Mount Holly NJ would like to thank the Berks County Emergency Management, the Kutztown Fire Department, and local Skywarn Coordinators for their assistance with this survey. * The information in this statement is preliminary and subject to change pending final review of the event and publication in NWS Storm Data. $$ Staarmann
Notable Radar Imagery (GR2Analyst and AWIPS)
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| Figure 1: KDIX radar reflectivity factor (left) and storm relative velocity (SRM, right) for the 0.5 degree elevation angle valid from 2341 to 2355 UTC 15 November 2020. This was the approximate time of the wind damage event in Maxatawny Twp, just northeast of Kutztown. Unfortunately, radar beam height in that area is over 7000 feet, and given the low-topped nature of this squall line, important lower level features are being missed. In addition, velocity data suffered from serious range folding at times. A weak velocity couplet is evident, indicating some rotation. However, storm survey results indicated damage consistent with straight line winds. It can be conjectured that a circulation likely attempted to develop, but “gusted out” as the rear flank downdraft surged ahead of it. Reflectivity data also shows a “break” in the line where the damage occurred, which is often characteristic of these events. This pattern was observed multiple times as storms moved closer to the radar where viewing was better. It was likely this downdraft surge caused the damage, with poor construction a contributing factor to the severe structural damage one building received. | Figure 2: TPHL radar reflectivity factor loop for the 0.4 degree elevation angle valid from 0119 to 0133 UTC 16 November 2020. Note the rapid formation of a hook echo just south of Lumberton, New Jersey. This was associated with a mesovortex which developed within the line. In QLCS events such as this, these signatures are often associated with locally enhanced wind damage, and can sometimes spawn brief tornadoes, though none were found to have occurred in this event. |
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| Figure 3: TPHL storm relative velocity loop for the 0.4 degree elevation angle for the same period as Figure 2. A rather strong velocity couplet is observed rapidly developing in the area of the hook echo mentioned above near Lumberton. As quickly as it forms, the couplet gusts out as it approaches Pemberton. | Figure 4: Same as Figure 1 valid from 0212 to 0227 UTC 16 November 2020. Multiple additional mesovortex circulations developed along the squall line as it moved towards the coast. In this loop alone, at least 4 brief but well-defined mesovorticies are seen in the velocity data, and are also associated with small nubs in the reflectivity data. An area of enhanced damage was observed in Mayetta, New Jersey, just south of Manahawkin, where one of these features passed by. Once again, it appeared to be straight line wind damage as the fleeting circulation gusted out. Other circulations are seen near Beach Haven and near Barnegat. |
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| Figure 5: KDIX radar reflectivity factor (left) and base velocity (V, right) for the 0.5 degree elevation angle valid 0220 UTC 16 November 2020. The squall line continued to produce wind damage all the way to the New Jersey coast. In fact, some pockets of more widespread damage were reported in southern Monmouth and northern Ocean Counties in New Jersey. A 63 mph wind gust was measured in Brick, NJ, and several trees were downed in Neptune Twp. At least one house there sustained heavy damage from a falling tree. Multiple other 55 to 65 mph gusts were measured along the coast. In areas where allowed by KDIX’s viewing angle (such as coastal Atlantic and Cape May Counties and offshore of Monmouth County), V values of 55 to 70 kt are detected at around 3000 ft above the surface, indicative of the strong low level jet in place.. | Figure 6: Multi-Radar/Multi-Sensor (MRMS) rainfall estimates for the 12 hour period ending at 0500 UTC 16 November 2020. Flooding was not a significant factor with this system, with rainfall totals generally on either side of 0.50 inches. However, most of that rain fell within half an hour in association with the squall line. High winds during the day caused many leaves to drop in the waning foliage season. This led to leaf-clogged drains and some nuisance roadway flooding. |
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