The pressure gradient (difference) between an intensifying low pressure system that moved northeast through the Saint Lawrence River Valley and a high pressure system building into Pennsylvania from the southwest produced strong west winds during the day on the 17th. This was in addition to the strong to severe thunderstorms that moved through the eastern part of the state during the early…
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PHI wrote it up.
The pressure gradient (difference) between an intensifying low pressure system that moved northeast through the Saint Lawrence River Valley and a high pressure system building into Pennsylvania from the southwest produced strong west winds during the day on the 17th. This was in addition to the strong to severe thunderstorms that moved through the eastern part of the state during the early morning of the 17th.
Daytime peak wind gusts averaged around 45 mph and tore down weak tree limbs and wires. The combination of the severe thunderstorms during the early morning and the gradient strong winds during the day of the 17th caused about 17,000 homes and businesses to lose power in southeastern Pennsylvania. All power was restored by Midnight EST on the 18th. The strong winds caused the Delaware River Port Authority to temporarily ban empty container trucks from crossing the Betsy Ross Bridge into or out of Philadelphia between 1 p.m. and 6 p.m. EST on the 17th.
The calendar day peak winds (some of these occurred during the early morning thunderstorms) included 56 mph in London Grove (Chester County), 47 mph in Mount Pocono (Monroe County), 45 mph at the Philadelphia International Airport and 43 mph at the Lehigh Valley International Airport.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Nov 17, 4:38 AM EST, 3 hours 22 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 415 AM EST WED NOV 17 2010 DEZ001>004-MDZ008-012-015-019-020-NJZ016-021-023-024-180915- NEW CASTLE-KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD- QUEEN ANNES-TALBOT-CAROLINE-SALEM-CUMBERLAND-CAPE MAY- ATLANTIC COASTAL CAPE MAY- 415 AM EST WED NOV 17 2010 ...WIND ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO 8 PM EST THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND AND SOUTHERN NEW JERSEY. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. MINOR TIDAL FLOODING IS POSSIBLE ALONG THE UPPER PORTION OF DELAWARE BAY AS WELL AS NEAR TOLCHESTER AND CAMBRIDGE MARYLAND ALONG THE UPPER PORTION OF CHESAPEAKE BAY DURING THE MIDDAY HIGH TIDE CYCLE TODAY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NJZ001-007>010-012>015-017>020-022-025>027-PAZ054-055-060>062- 067>071-180915- SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH- EASTERN MONMOUTH-MERCER-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON- OCEAN-ATLANTIC-COASTAL ATLANTIC-COASTAL OCEAN- SOUTHEASTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- 415 AM EST WED NOV 17 2010 ...WIND ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO 8 PM EST THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...SOUTHERN NEW JERSEY...EAST CENTRAL PENNSYLVANIA...NORTHEAST PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ450>452-180915- COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM- COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM- COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM- 415 AM EST WED NOV 17 2010 ...GALE WARNING IN EFFECT UNTIL MIDNIGHT EST TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. GALE WARNING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ430-431-453>455-180915- DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE- DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE- COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM- COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM- COASTAL WATERS FROM CAPE HENLOPEN TO FENWICK ISLAND DE OUT 20 NM- 415 AM EST WED NOV 17 2010 ...GALE WARNING IN EFFECT UNTIL 5 PM EST THIS AFTERNOON... THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND DELAWARE BAY WATERS. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. GALE WARNING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
235 AM EST WED NOV 17 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0229 AM TSTM WND GST BEAR 39.62N 75.68W
11/17/2010 M65.00 MPH NEW CASTLE DE TRAINED SPOTTER
DAVIS EQUIPMENT.
&&
WDRAGSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
257 AM EST WED NOV 17 2010
DEZ002>004-NJZ023-024-170830-
ATLANTIC COASTAL CAPE MAY NJ-CAPE MAY NJ-DELAWARE BEACHES DE-
INLAND SUSSEX DE-KENT DE-
257 AM EST WED NOV 17 2010
...A STRONG THUNDERSTORM WILL AFFECT CAPE MAY...KENT AND SUSSEX
COUNTIES...
AT 253 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER GEORGETOWN...MOVING NORTHEAST AT 50 MPH. THE
THUNDERSTORM WILL BE NEAR CAPE MAY AND WILDWOOD CREST AROUND 315 AM.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.
LAT...LON 3852 7527 3888 7548 3895 7530 3883 7521
3879 7511 3891 7498 3899 7498 3910 7491
3922 7463 3906 7473 3902 7479 3899 7479
3894 7486 3891 7497 3881 7508 3861 7505
3861 7514 3860 7510
HAYESPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
343 AM EST WED NOV 17 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0229 AM TSTM WND GST BEAR 39.62N 75.68W
11/17/2010 M65.00 MPH NEW CASTLE DE TRAINED SPOTTER
DAVIS EQUIPMENT.
0251 AM TSTM WND DMG 5 SE WOODSTOWN 39.60N 75.26W
11/17/2010 SALEM NJ EMERGENCY MNGR
TREES AND WIRES DOWN ON ROADS IN UPPER PITTSGROVE
TOWNSHIP PRETTY MUCH TOWNSHIP WIDE. LOCATION POSTED IS
APPROXIMATE.
0316 AM TSTM WND GST FORKS TWP 40.73N 75.22W
11/17/2010 M59.00 MPH NORTHAMPTON PA TRAINED SPOTTER
&&
WDRAGPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
356 AM EST WED NOV 17 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0229 AM TSTM WND GST BEAR 39.62N 75.68W
11/17/2010 M65.00 MPH NEW CASTLE DE TRAINED SPOTTER
DAVIS EQUIPMENT.
0251 AM TSTM WND DMG 5 SE WOODSTOWN 39.60N 75.26W
11/17/2010 SALEM NJ EMERGENCY MNGR
TREES AND WIRES DOWN ON ROADS IN UPPER PITTSGROVE
TOWNSHIP PRETTY MUCH TOWNSHIP WIDE. LOCATION POSTED IS
APPROXIMATE.
0316 AM TSTM WND GST FORKS TWP 40.73N 75.22W
11/17/2010 M59.00 MPH NORTHAMPTON PA TRAINED SPOTTER
0330 AM TSTM WND DMG MOUNT LAUREL 39.93N 74.93W
11/17/2010 BURLINGTON NJ LAW ENFORCEMENT
TREE DOWN ON HARTFORD ROAD NEAR RTE 38. TIME ESTIMATED.
&&
WDRAGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
410 AM EST WED NOV 17 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0342 AM TSTM WND DMG TRENTON 40.22N 74.76W
11/17/2010 MERCER NJ EMERGENCY MNGR
ROOFS RIPPED OFF BUILDINGS AT THE AIRPORT. SEVERAL PLANES
WERE FLIPPED OVER.
&&
HAYESPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
500 AM EST WED NOV 17 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0142 AM TSTM WND GST STEVENSVILLE 38.98N 76.31W
11/17/2010 M48.00 MPH QUEEN ANNE'S MD MESONET
A 48 MPH THUNDERSTORM WIND GUST WAS RECORDED AT THE
STEVENSVILLE BAY BRIDGE. REPORT VIA DEOS.
0148 AM TSTM WND GST TOLCHESTER BEACH NOS 39.21N 76.25W
11/17/2010 M41.00 MPH KENT MD MESONET
A 41 MPH THUNDERSTORM WIND GUST WAS RECORDED AT
TOLCHESTER BEACH. REPORT VIA DEOS.
0229 AM TSTM WND GST BEAR 39.62N 75.68W
11/17/2010 M65.00 MPH NEW CASTLE DE TRAINED SPOTTER
DAVIS EQUIPMENT.
0230 AM TSTM WND GST NEWARK 39.68N 75.76W
11/17/2010 M40.00 MPH NEW CASTLE DE MESONET
A 40 MPH THUNDERSTORM WIND GUST WAS RECORDED AT THE
NEWARK DEOS SITE.
0248 AM TSTM WND GST DOVER 39.16N 75.52W
11/17/2010 M56.00 MPH KENT DE ASOS
A 56 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE DOVER
AIR FORCE BASE.
0251 AM TSTM WND DMG 5 SE WOODSTOWN 39.60N 75.26W
11/17/2010 SALEM NJ EMERGENCY MNGR
TREES AND WIRES DOWN ON ROADS IN UPPER PITTSGROVE
TOWNSHIP PRETTY MUCH TOWNSHIP WIDE. LOCATION POSTED IS
APPROXIMATE.
0255 AM TSTM WND GST BERLINSVILLE 40.77N 75.57W
11/17/2010 M55.00 MPH NORTHAMPTON PA TRAINED SPOTTER
A 55 MPH THUNDERSTORM WIND GUST WAS REPORTED IN
BERLINSVILLE. SMALL HAIL OBSERVED FOR ABOUT 30 SECONDS.
0300 AM TSTM WND GST LONDON GROVE TWP 39.82N 75.81W
11/17/2010 M56.00 MPH CHESTER PA MESONET
A 56 MPH THUNDERSTORM WIND GUST WAS RECORDED AT LONDON
GROVE. TIME APPROXIMATE.
0300 AM TSTM WND GST SHIP JOHN SHOAL NOS 39.31N 75.38W
11/17/2010 M57.00 MPH ANZ430 NJ BUOY
A 57 MPH THUNDERSTORM WIND GUST WAS RECORDED AT SHIP JOHN
SHOAL.
0300 AM TSTM WND GST NEWBOLD NOS 40.14N 74.75W
11/17/2010 M44.00 MPH BUCKS PA MESONET
A 44 MPH THUNDERSTORM WIND GUST WAS RECORDED AT NEWBOLD
ISLAND.
0303 AM TSTM WND GST ALLENTOWN 40.59N 75.48W
11/17/2010 M41.00 MPH LEHIGH PA ASOS
A 41 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE
LEHIGH VALLEY INTERNATIONAL AIRPORT.
0315 AM TSTM WND GST PHILADELPHIA INTL AIRPO 39.87N 75.24W
11/17/2010 M41.00 MPH PHILADELPHIA PA ASOS
A 41 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE
PHILADELPHIA INTERNATIONAL AIRPORT.
0316 AM TSTM WND GST FORKS TWP 40.73N 75.22W
11/17/2010 M59.00 MPH NORTHAMPTON PA TRAINED SPOTTER
0330 AM TSTM WND DMG MOUNT LAUREL 39.93N 74.93W
11/17/2010 BURLINGTON NJ LAW ENFORCEMENT
TREE DOWN ON HARTFORD ROAD NEAR RTE 38. TIME ESTIMATED.
0342 AM TSTM WND GST TRENTON 40.22N 74.76W
11/17/2010 M54.00 MPH MERCER NJ ASOS
A 54 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE
TRENTON MERCER COUNTY AIRPORT.
0342 AM TSTM WND DMG TRENTON 40.22N 74.76W
11/17/2010 MERCER NJ EMERGENCY MNGR
ROOFS RIPPED OFF BUILDINGS AT THE AIRPORT. SEVERAL PLANES
WERE FLIPPED OVER.
0420 AM TSTM WND GST PERTH AMBOY 40.52N 74.27W
11/17/2010 M48.00 MPH MIDDLESEX NJ MESONET
A 48 MPH THUNDERSTORM WIND GUST WAS RECORDED AT PERTH
AMBOY.
0440 AM TSTM WND GST SANDY HOOK 40.44N 73.99W
11/17/2010 M44.00 MPH MONMOUTH NJ MESONET
A 44 MPH THUNDERSTORM WIND GUST WAS RECORDED AT SANDY
HOOK.
&&
GORSEThe national radar mosaic for the moment the first event began.
10 strong wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2010Every state in 2010This day in weather historyWarnings in Pennsylvania, November 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 268324, 268325, 268326, 268327, 268328, 268329, 268330, 268331, 268332, 268333.