A cold front approaching from the west produced strong to isolated severe thunderstorms across Delaware during the late afternoon of the 29th.
Every event with a place to put it. 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.
A cold front approaching from the west produced strong to isolated severe thunderstorms across Delaware during the late afternoon of the 29th.
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 Jul 29, 2:32 PM EST, 2 hours 18 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
332 PM EDT WED JUL 29 2009
.SYNOPSIS...
A WEAK COLD FRONT WILL MOVE THROUGH MOST OF OUR AREA TONIGHT AND
DISSIPATE THURSDAY MORNING. ANOTHER FRONT WILL APPROACH OUR AREA
FROM THE WEST FRIDAY AND MOVE JUST OFF THE COAST EARLY SATURDAY AS
WEAK HIGH PRESSURE ARRIVES. MORE LOW PRESSURE IS EXPECTED AT TIMES
FROM LATER SUNDAY THROUGH THE MIDDLE OF NEXT WEEK.
&&
.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
THE FIRST ROUND OF SEVERE WEATHER OCCURRED OVER OUR NORTHWESTERN
AND NORTHERN ZONES THIS AFTERNOON SO FAR. ANOTHER SHORT WAVE IS
SEEN APPROACHING FROM THE SOUTHWEST, AS ILLUSTRATED BY THE
DEVELOPING CONVECTION OVER NORTHEASTERN MARYLAND. THE AIRMASS MAY
HAVE BEEN SOMEWHAT STABILIZED WHERE PRIOR CONVECTION OCCURRED, BUT
WITH A LINE OF CONVECTION STILL JUST WEST OF THERE, MORE COULD
COULD OCCUR SO THE SEVERE THUNDERSTORM WATCH WILL REMAIN INN
EFFECT WHERE IT WAS ISSUED PREVIOUSLY THROUGH 00Z. FURTHER
SOUTHWEST FROM PHILADELPHIA AND SOUTHEASTWARD, THE AIRMASS
REMAINS PRIMED FOR CONVECTIVE ACTION. AT LEAST MODERATE
INSTABILITY, QUITE HIGH LOW LEVEL MOISTURE, FAVORABLE UPPER
DYNAMICS, AND THE APPROACH OF A LOW LEVEL FORCING MECHANISM
INDICATE THE POTENTIAL FOR STRONG TO SEVERE STORMS THIS EVENING.
HIGH PRECIPITATION CHANCES SHOULD DROP PRECIPITOUSLY WITH THE
PASSAGE OF THE UPPER DISTURBANCE AFTER MIDNIGHT, AND THE WANING
DIURNAL EFFECTS. HOWEVER, A CHANCE OF A SHOWER OR THUNDERSTORM
WILL BE KEPT. LATER FORECASTERS MAY BE ABLE TO REDUCE IT TO SLIGHT
CHANCE OR REMOVE IT ALTOGETHER DEPENDING ON THE EVOLUTION OF
EVENTS.
WITH HIGH GROUND AND LOW LEVEL MOISTURE OVERNIGHT, PATCHY FOG WAS
ADDED TO THE WEATHER GRIDS LATE TONIGHT.
&&
.SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY/...
ANOTHER CONVECTIVE EVENT IS SHAPING UP FOR FRIDAY. AGAIN, HIGH
HUMIDITY, GOOD UPPER DYNAMICS, AND AN APPROACHING SURFACE FRONT
LOOK TO ACT ON AN UNSTABLE ATMOSPHERE. THE AREA IS ALREADY IN SEE
TEXT FROM SPC.
OTHERWISE, SMALL CONVECTIVE CHANCES WILL REMAIN THROUGHOUT THE
SHORT TERM PERIOD DUE TO DIURNAL AND TERRAIN EFFECTS.
&&
.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
AGAIN, MOST PERIODS WILL CONTINUE TO HAVE AT LEAST LOW RAIN
CHANCES AS PERIODIC LOW PRESSURE WILL AFFECT OUR AREA THROUGH THE
MIDDLE OF NEXT WEEK. LATER PERIODS WERE PEGGED AS SLIGHT CHANCE,
SO THEY WERE INVISIBLE IN THE WORDED FORECASTS. HPC TEMPERATURES
AND WINDS WERE USED AS THEY LOOKED REASONABLE AND BLENDED WITH
SURROUNDING OFFICES. GENERALLY, NORMAL TO SLIGHTLY ABOVE NORMAL
TEMPERATURES APPEAR REASONABLE.
&&
.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY AND SURROUNDING AREAS.
THE 18Z TAFS WILL BE KEYING ON THE NEXT UPPER AIR DISTURBANCE TO
PRODUCE AN ORGANIZED AREA OF CONVECTION MAINLY DURING THE EVENING
HOURS. THIS IS THE CONVECTION THAT IS CURRENTLY IN VIRGINIA. IFR
CONDITIONS ARE POSSIBLE WHEN THIS BATCH OF TSRAS MOVE THROUGH. SOME
STRONG GUSTY WINDS ARE ALSO POSSIBLE, THE SOONER THEY ARRIVE THE
HIGHER THE CHANCES OF THE LATTER OCCURRING. PRIOR TO THAT DURING
THE REST OF THE AFTERNOON WITH THE FIRST UPPER AIR DISTURBANCE
EXITING NE OF THE KABE AND KTTN TERMINALS AND THERE SHOULD BE A
RELATIVE LULL. CONVECTIVE TEMPS ARE BEING REACHED AND WIDELY
SCATTERED CONVECTION SHOULD OCCUR PRIOR TO THAT FEATURE.
CONVECTION SHOULD WANE TONIGHT, BUT THE AIR SHOULD REMAIN HUMID AND
MOST LIKELY IFR CONDITIONS WILL DEVELOP DUE TO LOW CLOUDS AND OR
FOG. CONDITIONS SHOULD BEGIN TO IMPROVE AGAIN AFTER DAYBREAK
THURSDAY WITH GENERALLY VFR CONDITIONS EXPECTED DURING THE REST OF
THE DAY.
OUTLOOK...A SERIES OF WEAKENING COLD FRONTS SHOULD BRING ORGANIZED
CONVECTION AND MORE WIDESPREAD IFR OR MVFR CONDITIONS LATER FRIDAY
AND LATER SUNDAY INTO MONDAY. AROUND THOSE PERIODS MORE ISOLATED
OR WIDELY SCATTERED CONVECTION IS POSSIBLE, BUT THE IMPACT SHOULD
NOT BE WIDESPREAD IN EITHER TIME OR AREAL EXTENT.
&&
.MARINE...
WINDS AND SEAS ARE STILL EXPECTED TO INCREASE IN ADVANCE OF THE
APPROACHING FRONT. GUIDANCE FORECASTS FOR THE OFFSHORE BUOYS ARE
MARGINAL IN TERMS OF WIND SPEEDS, WHILE WAVEWATCH GUIDANCE MOVES THE
SEAS FIRMLY INTO ADVISORY TERRITORY TONIGHT. GUIDANCE SEEMS TO HAVE
CONDITIONS BACKING DOWN BELOW ADVISORY CRITERIA DURING THE DAY ON
THURSDAY, AND WE WILL CONTINUE TO END THE ADVISORY ON THE OCEAN AT
NOON. OVER THE LOWER BAY, THE BEST CHANCE OF ADVISORY CONDITIONS
WILL BE NEAR THE MOUTH OF THE BAY /INDICATIONS FROM BRANDYWINE
NOTWITHSTANDING/, AND WE WILL CONTINUE TO WORD IT THAT WAY IN THE
TEXT PRODUCT. IT REMAINS UP THERE FOR TONIGHT ONLY.
A CAVEAT IS THAT STRONG THUNDERSTORMS MAY MOVE OVER THE WATERS
THROUGH TONIGHT, AND THEY WOULD CREATE LOCALLY HAZARDOUS
CONDITIONS.
THE WEATHER PATTERN WILL CONTINUE TO REPEAT ITSELF OVER THE NEXT
COUPLE OF DAYS WITH SIMILAR RESULTS EXPECTED. SMALL ADVISORY
CONDITIONS MORE FOR SEAS THAN WINDS MAY DEVELOP AGAIN ON FRIDAY IN
THE SOUTHERLY FLOW PRECEDING THE NEXT COLD FRONT. SEAS SHOULD THEN
SUBSIDE ON SATURDAY AS THE FRONT EITHER CLEARS OR DISSIPATES OVER
THE REGION AND THE PRESSURE GRADIENT DECREASES. WEAK HIGH PRESSURE
SHOULD THEN BUILD IN FOR LATER SATURDAY INTO SUNDAY BEFORE WE ARE
EXPECTED TO REPEAT THE PROCESS AGAIN (POSSIBLE SMALL CRAFT ADVISORY
MORE FOR SEAS THAN WINDS) LATER SUNDAY INTO MONDAY.
&&
.HYDROLOGY...
THE FLASH FLOOD WATCH WILL CONTINUE THIS EVENING IN VIEW OF THE
HEAVY RAIN THAT FELL OVER THE NORTHWESTERN SECTIONS OF OUR FORECAST
AREA THIS AFTERNOON, AND THE ACTIVITY TAKING SHAPE THAT IS
UPSTREAM WITH THE NEXT SHORT WAVE ALOFT. PRECIPITABLE WATER VALUES
ARE STILL 1.5 TO 2 INCHES. OUR NORTHWESTERN ZONES, EXCLUDING THE
POCONOS FOR NOW, ARE STILL VIEWED AS THE MOST SUSCEPTIBLE AREAS
FOR ADDITIONAL FLASH FLOODING THIS EVENING AND LEADING INTO THE
OVERNIGHT.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR PAZ060>062-067>071.
NJ...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR NJZ001-007>010-012-
015.
DE...NONE.
MD...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL NOON EDT THURSDAY FOR ANZ450>455.
SMALL CRAFT ADVISORY FROM 8 PM THIS EVENING TO 6 AM EDT
THURSDAY FOR ANZ431.
&&
SYNOPSIS...
NEAR TERM...
SHORT TERM...
LONG TERM...
AVIATION...GIGI
MARINE...GIGI
HYDROLOGY...HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 519 PM EDT WED JUL 29 2009 NJZ001-007>010-012-015-PAZ061-062-069-302130- SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-LEHIGH- NORTHAMPTON-BUCKS- 519 PM EDT WED JUL 29 2009 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... ...SEVERE THUNDERSTORM WATCH 634 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...EAST CENTRAL PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. FLASH FLOOD WATCH. SEVERE THUNDERSTORM WATCH. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT THE REGION THROUGH THIS EVENING. THESE STORMS MAY CONTAIN VERY HEAVY RAIN, DAMAGING WINDS, LARGE HAIL, AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE IS A CHANCE OF STRONG THUNDERSTORMS FRIDAY...OTHERWISE THE PROBABILITY OF SEVERE WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. NJZ013-014-PAZ054-055-302130- WESTERN MONMOUTH-EASTERN MONMOUTH-CARBON-MONROE- 519 PM EDT WED JUL 29 2009 ...SEVERE THUNDERSTORM WATCH 634 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY AND NORTHEAST PENNSYLVANIA. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT THE REGION THROUGH THIS EVENING. THESE STORMS MAY CONTAIN VERY HEAVY RAIN, DAMAGING WINDS, LARGE HAIL, AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE IS A CHANCE OF STRONG THUNDERSTORMS FRIDAY...OTHERWISE THE PROBABILITY OF SEVERE WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. DEZ001>003-MDZ008-012-015-019-020-NJZ016>027-302130- NEW CASTLE-KENT-INLAND SUSSEX-CECIL-KENT MD-QUEEN ANNES-TALBOT- CAROLINE-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-OCEAN- CUMBERLAND-ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY- COASTAL ATLANTIC-COASTAL OCEAN-SOUTHEASTERN BURLINGTON- 519 PM EDT WED JUL 29 2009 ...SEVERE THUNDERSTORM WATCH 634 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND AND SOUTHERN NEW JERSEY. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT THE REGION THROUGH THIS EVENING. THESE STORMS MAY CONTAIN VERY HEAVY RAIN, DAMAGING WINDS, LARGE HAIL, AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE IS A CHANCE OF STRONG THUNDERSTORMS FRIDAY...OTHERWISE THE PROBABILITY OF SEVERE WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. PAZ060-067-068-070-071-302130- BERKS-CHESTER-MONTGOMERY-DELAWARE-PHILADELPHIA- 519 PM EDT WED JUL 29 2009 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... ...SEVERE THUNDERSTORM WATCH 634 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. FLASH FLOOD WATCH. SEVERE THUNDERSTORM WATCH. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT THE REGION THROUGH THIS EVENING. THESE STORMS MAY CONTAIN VERY HEAVY RAIN, DAMAGING WINDS, LARGE HAIL, AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE IS A CHANCE OF STRONG THUNDERSTORMS FRIDAY...OTHERWISE THE PROBABILITY OF SEVERE WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. ANZ450>455-302130- 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- 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- 519 PM EDT WED JUL 29 2009 ...SEVERE THUNDERSTORM WATCH 634 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT THURSDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. SMALL CRAFT ADVISORY. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT THE REGION THROUGH THIS EVENING. THESE STORMS MAY CONTAIN VERY HEAVY RAIN, DAMAGING WINDS, LARGE HAIL, AND FREQUENT CLOUD TO SURFACE LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SMALL CRAFT ADVISORY. THERE IS A CHANCE OF STRONG THUNDERSTORMS FRIDAY...OTHERWISE THE PROBABILITY OF SEVERE WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. ANZ430-DEZ004-302130- DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE- DELAWARE BEACHES- 519 PM EDT WED JUL 29 2009 ...SEVERE THUNDERSTORM WATCH 634 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN DELAWARE AND DELAWARE BAY WATERS. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT THE REGION THROUGH THIS EVENING. THESE STORMS MAY CONTAIN VERY HEAVY RAIN, DAMAGING WINDS, LARGE HAIL, AND FREQUENT CLOUD TO SURFACE LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE IS A CHANCE OF STRONG THUNDERSTORMS FRIDAY...OTHERWISE THE PROBABILITY OF SEVERE WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. ANZ431-302130- DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE- 519 PM EDT WED JUL 29 2009 ...SEVERE THUNDERSTORM WATCH 634 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 AM EDT THURSDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR DELAWARE BAY WATERS. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. SMALL CRAFT ADVISORY. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT THE REGION THROUGH THIS EVENING. THESE STORMS MAY CONTAIN VERY HEAVY RAIN, DAMAGING WINDS, LARGE HAIL, AND FREQUENT CLOUD TO SURFACE LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE IS A CHANCE OF STRONG THUNDERSTORMS FRIDAY...OTHERWISE THE PROBABILITY OF SEVERE WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 257 PM EDT WED JUL 29 2009 DEZ001-002-MDZ008-012-015-019-020-NJZ016-021-PAZ067-292000- CAROLINE MD-CECIL MD-CHESTER PA-CUMBERLAND NJ-KENT MD-KENT DE- NEW CASTLE DE-QUEEN ANNES MD-SALEM NJ-TALBOT MD- 257 PM EDT WED JUL 29 2009 ...AN AREA OF SHOWERS MAY PRODUCE HEAVY RAINFALL AND AFFECT KENT... CAROLINE...CECIL...SALEM...CUMBERLAND...CHESTER...NEW CASTLE...QUEEN ANNES AND TALBOT COUNTIES... AT 254 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF SHOWERS WHICH MAY PRODUCE HEAVY RAINFALL AND WIND GUSTS OF 35 TO 40 MPH. THEY WERE MOVING TO THE NORTHEAST AT 30 TO 35 MPH. THESE SHOWERS AND THUNDERSTORMS COULD BECOME MORE NUMEROUS OVER THE NEXT HOUR. EBERWINE
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
336 PM EDT WED JUL 29 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1206 PM HAIL 4 N VALLEY FORGE 40.15N 75.48W
07/29/2009 M1.50 INCH MONTGOMERY PA TRAINED SPOTTER
PING PONG SIZE HAIL REPORT IN UPPER PROVIDENCE TWP
1233 PM TSTM WND DMG JIM THORPE 40.87N 75.74W
07/29/2009 CARBON PA TRAINED SPOTTER
TREES, POWER LINES, AND HIGH TENSION LINES DOWN
1233 PM HAIL JIM THORPE 40.87N 75.74W
07/29/2009 M1.00 INCH CARBON PA TRAINED SPOTTER
0135 PM TSTM WND DMG WSW STORMVILLE 40.95N 75.25W
07/29/2009 MONROE PA TRAINED SPOTTER
NUMBEROUS TREES DOWN WITH HOUSE DAMAGE IN STROUD AND
HAMILTON TWPS.
0140 PM FLASH FLOOD 4 SSE MOUNT POCONO 41.07N 75.33W
07/29/2009 MONROE PA TRAINED SPOTTER
SMALL STREAM FLOODING. STREAM OUT OF BANK CROSSING A
ROADWAY.
0140 PM TSTM WND DMG STROUDSBURG 40.98N 75.20W
07/29/2009 MONROE PA TRAINED SPOTTER
NUMEROUS TREES DOWN. ROOF BLOWN OFF OF HOUSE IN
STROUDSBURG AREA.
0210 PM TSTM WND GST EDISON 40.53N 74.37W
07/29/2009 E70.00 MPH MIDDLESEX NJ TRAINED SPOTTER
70 MPH WIND GUST WITH TREES AND BRANCHES DOWN.
0213 PM HAIL SOUTH PLAINFIELD 40.58N 74.42W
07/29/2009 E1.00 INCH MIDDLESEX NJ TRAINED SPOTTER
QUARTER SIZE HAIL.
0215 PM LIGHTNING 1 NW SAYREVILLE 40.47N 74.33W
07/29/2009 MIDDLESEX NJ BROADCAST MEDIA
HOUSE STRUCK BY LIGHTNING IN SAYREVILLE
0215 PM HAIL SKILLMAN 40.42N 74.71W
07/29/2009 E0.88 INCH SOMERSET NJ TRAINED SPOTTER
PEA TO NICKEL SIZE HAIL ON SKILLMAN/HILLSBOROUGH BORDER.
0250 PM TSTM WND DMG 5 NNE PELLETTOWN 41.23N 74.65W
07/29/2009 SUSSEX NJ TRAINED SPOTTER
TREES DOWN ON RT 23 IN WANTAGE.
&&
ROBERTSON/KLINESPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 336 PM EDT WED JUL 29 2009 DEZ001>003-MDZ008-012-015-019-020-NJZ001-007>010-012>023-027-PAZ054- 055-060>062-067>071-292030- ATLANTIC NJ-BERKS PA-BUCKS PA-CAMDEN NJ-CAPE MAY NJ-CARBON PA- CAROLINE MD-CECIL MD-CHESTER PA-CUMBERLAND NJ-DELAWARE PA- EASTERN MONMOUTH NJ-GLOUCESTER NJ-HUNTERDON NJ-INLAND SUSSEX DE- KENT MD-KENT DE-LEHIGH PA-MERCER NJ-MIDDLESEX NJ-MONROE PA- MONTGOMERY PA-MORRIS NJ-NEW CASTLE DE-NORTHAMPTON PA- NORTHWESTERN BURLINGTON NJ-OCEAN NJ-PHILADELPHIA PA-QUEEN ANNES MD- SALEM NJ-SOMERSET NJ-SOUTHEASTERN BURLINGTON NJ-SUSSEX NJ-TALBOT MD- WARREN NJ-WESTERN MONMOUTH NJ- 336 PM EDT WED JUL 29 2009 ...POTENTIAL FOR STRONG THUNDERSTORMS THIS AFTERNOON AND EVENING FOG A GOOD PART OF THE AREA... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR AREAS NORTH OF A PHILADELPHIA...MANASQUAN NEW JERSEY LINE UNTIL 8 PM EDT. AT 331 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A NUMEROUS SHOWERS AND THUNDERSTORMS DEVELOPING OVER MARYLANDS EASTERN SHORE...REMAINDER OF SOUTHEAST PENNSYLVANIA...MOST OF DELAWARE AND NEW JERSEY. THERE HAVE BEEN REPORTS OF DAMAGING WINDS...HAIL AND VERY HEAVY RAIN IN ADDITION TO THE INTENSE LIGHTNING. FLOOD WARNINGS AND FLOOD ADVISORIES ARE IN EFFECT FOR PARTS OF THE POCONOS AND NORTHWEST NEW JERSEY. PERSONS IN THE SEVERE THUNDERSTORM WATCH AREA...AND WHERE HEAVY RAIN HAS OCCURRED SHOULD REMAIN ALERT FOR ADDITIONAL SEVERE WEATHER. ALSO...PERSONS WHO HAVE NOT EXPERIENCED SEVERE WEATHER TODAY SHOULD ALSO BE ON THE LOOKOUT FOR STRONG DAMAGING THUNDERSTORMS. EBERWINE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 341 PM EDT WED JUL 29 2009 DEZ001>003-MDZ008-012-015-019-020-NJZ001-007>010-012>023-027-PAZ054- 055-060>062-067>071-292030- ATLANTIC NJ-BERKS PA-BUCKS PA-CAMDEN NJ-CAPE MAY NJ-CARBON PA- CAROLINE MD-CECIL MD-CHESTER PA-CUMBERLAND NJ-DELAWARE PA- EASTERN MONMOUTH NJ-GLOUCESTER NJ-HUNTERDON NJ-INLAND SUSSEX DE- KENT MD-KENT DE-LEHIGH PA-MERCER NJ-MIDDLESEX NJ-MONROE PA- MONTGOMERY PA-MORRIS NJ-NEW CASTLE DE-NORTHAMPTON PA- NORTHWESTERN BURLINGTON NJ-OCEAN NJ-PHILADELPHIA PA-QUEEN ANNES MD- SALEM NJ-SOMERSET NJ-SOUTHEASTERN BURLINGTON NJ-SUSSEX NJ-TALBOT MD- WARREN NJ-WESTERN MONMOUTH NJ- 341 PM EDT WED JUL 29 2009 ...POTENTIAL FOR STRONG THUNDERSTORMS THIS AFTERNOON AND EVENING FOR A GOOD PART OF THE AREA... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR AREAS NORTH OF A PHILADELPHIA...MANASQUAN NEW JERSEY LINE UNTIL 8 PM EDT. AT 331 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A NUMEROUS SHOWERS AND THUNDERSTORMS DEVELOPING OVER MARYLANDS EASTERN SHORE...REMAINDER OF SOUTHEAST PENNSYLVANIA...MOST OF DELAWARE AND NEW JERSEY. THERE HAVE BEEN REPORTS OF DAMAGING WINDS...HAIL AND VERY HEAVY RAIN IN ADDITION TO THE INTENSE LIGHTNING. FLOOD WARNINGS AND FLOOD ADVISORIES ARE IN EFFECT FOR PARTS OF THE POCONOS AND NORTHWEST NEW JERSEY. PERSONS IN THE SEVERE THUNDERSTORM WATCH AREA...AND WHERE HEAVY RAIN HAS OCCURRED SHOULD REMAIN ALERT FOR ADDITIONAL SEVERE WEATHER. ALSO...PERSONS WHO HAVE NOT EXPERIENCED SEVERE WEATHER TODAY SHOULD ALSO BE ON THE LOOKOUT FOR STRONG DAMAGING THUNDERSTORMS. EBERWINE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 443 PM EDT WED JUL 29 2009 DEZ001>004-MDZ008-012-015-019-020-PAZ067-292145- CAROLINE MD-CECIL MD-CHESTER PA-DELAWARE BEACHES DE-INLAND SUSSEX DE- KENT MD-KENT DE-NEW CASTLE DE-QUEEN ANNES MD-TALBOT MD- 443 PM EDT WED JUL 29 2009 ...STRONG THUNDERSTORMS WILL AFFECT CAROLINE...CECIL...CHESTER... KENT...NEW CASTLE...QUEEN ANNES...SUSSEX AND TALBOT COUNTIES... AT 436 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 23 MILES SOUTH OF EASTON TO 11 MILES SOUTHWEST OF SALISBURY TO 23 MILES SOUTH OF SALISBURY...MOVING NORTHEAST AT 35 MPH. THE THUNDERSTORMS WILL BE NEAR OXFORD AROUND 455 PM...TRAPPE...HAMBLETON...ST. MICHAELS... TALBOT AROUND 500 PM...WINDYHILL...COPPERVILLE AROUND 505 PM... CHOPTANK...TANYARD AND EASTON AROUND 510 PM. WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE STORMS...ALONG WITH SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING FROM THESE STORMS. OTHER THUNDERSTORMS ARE ALSO DEVELOPING OVER THE MARYLAND UPPER EASTERN SHORE AND PARTS OF CENTRAL AND NORTHERN DELAWARE. NONE OF THESE STORMS SEEM TO BE SEVERE AT THIS TIME...HOWEVER THEY COULD RAPIDLY INTENSIFY. STAY ALERT FOR ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS. FORECASTER: AMC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 443 PM EDT WED JUL 29 2009 NJZ009-015-017>019-PAZ068>071-292145- BUCKS PA-CAMDEN NJ-DELAWARE PA-GLOUCESTER NJ-HUNTERDON NJ-MERCER NJ- MONTGOMERY PA-NORTHWESTERN BURLINGTON NJ-PHILADELPHIA PA- 443 PM EDT WED JUL 29 2009 ...AN AREA OF SHOWERS PRODUCING HEAVY RAINFALL WILL AFFECT THE DELAWARE VALLEY NORTHEAST INTO HUNTERDON COUNTY NEW JERSEY... AT 439 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF SHOWERS PRODUCING HEAVY RAINFALL 3 MILES WEST OF CAMDEN... SOUTHWEST TO THE PHILADELPHIA AREA. THEY ARE MOVING RATHER QUICKLY BUT OVER THE SAME GENERAL AREA WHICH WILL CAUSE SOME STREET AND HIGHWAY FLOODING THROUGH RUSH HOUR. THE SHOWERS AND OCCASIONAL THUNDERSTORM WILL LAST ABOUT AN HOUR BUT MORE ARE EXPECTED TO MOVE INTO THE SAME REGION ADDING TO THE POTENTIAL FOR FLOODING. EBERWINE
The Dover AFB radar (KDOX), 38 km away, was scanning. The volume nearest the first event began at 21:51 UTC.
1 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm caused roof damage to a building within the Enterprise Building Park in Dover.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Delaware in 2009Every state in 2009This day in weather historyWarnings in Delaware, July 2009
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: 189221.