A thunderstorm produced a funnel cloud in southern Delaware during the afternoon of the 1st.
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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 thunderstorm produced a funnel cloud in southern Delaware during the afternoon of the 1st.
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 Sep 1, 9:35 AM EST, 3 hours 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1035 AM EDT SUN SEP 1 2013 .SYNOPSIS... SOUTHERLY WINDS AROUND THE BERMUDA HIGH WILL MAINTAIN WARM, MUGGY AND SUMMER-LIKE CONDITIONS OVER THE AREA FOR SUNDAY AND MONDAY. SHOWERS AND THUNDERSTORMS WILL BE SCATTERED TO NUMEROUS AT TIMES. THEN A COLD FRONT APPROACHING FROM THE WEST WILL CROSS THE AREA ON TUESDAY, FOLLOWED BY COOLER AND DRIER HIGH PRESSURE FOR TUESDAY NIGHT THROUGH THE REMAINDER OF THE WEEK. A RE-ENFORCING COOL FRONT ON THURSDAY SHOULD HAVE LITTLE OR NO ASSOCIATED PRECIPITATION. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... THE INITIAL SHORT WAVE/VORTICITY IMPULSE HAS PUSHED TO OUR EAST THIS MORNING. A FEW SHOWERS AND WITH OCCASIONAL LIGHTNING WILL CONTINUE TO MOVE THROUGH NORTHERN NEW JERSEY THIS MORNING. ONCE THESE MOVE OUT OF THE AREA AND/OR DISSIPATE, WE SHOULD HAVE A BREAK IN THE PRECIPITATION FOR A FEW HOURS UNTIL THIS AFTERNOON WHEN A SECONDARY SHORT WAVE APPROACHES FROM THE WEST. THERE REMAINS A FAIR AMOUNT OF INSTABILITY ACROSS THE AREA THROUGH THE DAY, AND WITH THE AMOUNT OF MOISTURE IN THE AIR, EVIDENT FROM THE HIGH PW VALUES, WE EXPECT SHOWERS AND THUNDERSTORMS TO BEGIN DEVELOPING LATER IN THE DAY. THAT BEING SAID, THE CONTINUED LACK OF SHEAR REMAINS THE INHIBITING FACTOR FOR THE LONGEVITY OF THESE STORMS, SO PULSE IS STILL THE PREFERRED MODE. GIVEN THE WEAKER FLOW THAT WILL BE IN PLACE, WE EXPECT THE STORMS BE TO SLOWER MOVERS AND DUMP QUITE A BIT OF WATER WHERE THEY MOVE. LOW STRATUS REMAINS ACROSS A GOOD PORTION OF THE AREA AND WILL TAKE A BIT LONGER TO BURN OFF AND SCATTER OUT. THIS SHOULD OCCUR LATE THIS MORNING INTO THIS AFTERNOON, GIVING WAY TO A FAIR AMOUNT OF SUNSHINE. ONCE THE SUN COMES OUT, WE SHOULD WARM FAIRLY NICELY ONCE AGAIN. A BLEND OF THE MET/MAV WAS USED AGAIN THIS MORNING GIVING WAY TO HIGHS ABOUT 4 TO 5 DEGREES ABOVE NORMAL. && .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY NIGHT/... CONTINUE TO EXPERIENCE MUCH IN THE SAME AS LAST NIGHT THOUGH THERE COULD BE SCATTERED CONVECTION IN PLACE AT THE START OF THE OVERNIGHT PERIOD. BETTER MID-LEVEL IMPULSE CROSSES OVER THE LAKES TONIGHT AND PEGS A FEW BULLS-EYES ACROSS OUR NORTHERN ZONES IN TERMS OF CONVECTION AND QPFS. A STRONG FLOW STILL DOES NOT EXIST ALOFT SO ANY OF THE STORMS THAT DO FORM TONIGHT WILL BE SLOW TO MOVE THROUGH. THE LIGHT SOUTHERLY FLOW WILL ONCE AGAIN PRODUCE STRATUS AND FOG LATE TONIGHT. THIS WILL ALLOW TEMPERATURES TO REMAIN QUITE ELEVATED AGAIN WITH LOWS DIPPING INTO THE LOW-70S IN A LOT OF SPOTS. && .LONG TERM /TUESDAY THROUGH SATURDAY/... THE EXTENDED PERIOD STARTS WITH A SHRTWV TROF DIGGING SEWD THRU THE GRTLKS ON MONDAY AND THEN ACROSS THE MID- ATLANTIC RGN ON TUESDAY. THE ASSOCD COLD FRONT WILL EXTEND APPROX FROM THE LOWER GRTLKS TO THE LOWER OH VLY MONDAY MORNING AND WILL MOVE EWD TO REACH SOMEWHERE INVOF NJ BY TUESDAY MORNING. THE AMS AHEAD OF THE FRONT ON MONDAY WILL REMAIN QUITE MOIST AND SHOULD BECOME SMWHAT UNSTABLE BY MONDAY AFTN...DEPENDING ON HOW MUCH SFC HEATING CAN OCCUR. FCST MAX TEMPS ARE UPPER 80S TO AROUND 90 AND MAX CAPE IS FCST AROUND 2000 J/KG. A SFC TROF IS EXPECTED TO DVLP N-S ACROSS THE FCST AREA ON MONDAY WHICH WILL PROMOTE LOW- LVL CONVERGENCE AND TSTM DEVELOPMENT. A FEW SVR TSTMS ARE POSSIBLE MONDAY AFTN INTO THE EVENING...ALTHO THE BIGGER THREAT MAY WELL BE HEAVY RAIN AND POSSIBLY SOME FLOODING. ON TUESDAY MORNING THE FRONT SHOULD BE MOVG W TO E ACROSS NJ AND VCNTY. BECAUSE OF ITS RATHER SLOW MOVEMENT SOME SHRA AND TSRA ACTIVITY IS EXPECTED TO CONTINUE DURING THE DAY...HWVR POPS SHOULD BE DIMINISHING W TO E DURING THE DAY WITH HIGHER POPS GENLY S/E OF PHL AND ALONG THE COASTAL AREAS. EXPECT ALL PRECIP SHOULD BE ENDED BY LATE TUES AFTN. WITH COOLER AND DRIER AIR MOVING IN BEHIND THE FRONT...MAX TEMPS ON TUES WILL BE SMWHT LOWER THAN MONDAY...AND WITH MORE OF A GRADIENT FROM SE TO NW. OVERNIGHT MIN TEMPS TUES NIGHT WILL BE 10 TO 15 DEG F COOLER AS THE NEW AMS PUSHES IN WITH FULL FORCE. THE FORECAST FOR WED AND BEYOND WAS NOT ALTERED MUCH AS IT LOOKS TO BE DRY WITH NW FLOW ALOFT. ANOTHER COLD FRONT IS FCST TO MOVE ACROSS THE AREA FROM N TO S ON THURSDAY BUT ATTM IT APPEARS THAT AVAILABLE MOISTURE WILL BE RATHER SPARSE SO THERE IS NO MENTION OF PRECIP IN THE FCST. && .AVIATION /14Z SUNDAY THROUGH THURSDAY/... THIS MORNING - THIS AFTERNOON...LOW CIGS CONTINUE TO PLAGUE THE MAJORITY OF THE TAF SITES THIS MORNING AND WILL BE SLOW TO LIFT. IFR/MVFR ARE IN PLACE FROM RDG-PNE-ACY NORTHWARD; SOUTH OF THIS LINE, GENERAL VFR CONDITIONS ARE IN PLACE. AS THE SUN SHINES THROUGH BREAKS IN THE CLOUDS THIS MORNING, IT WILL HELP ERODE THE LOWER CLOUDS, ALBEIT SLOWLY. WE EXPECT EVERYONE TO BE VFR BY THIS AFTERNOON, WHEN ADDITIONAL SHOWERS, AND POSSIBLE THUNDERSTORMS ARE EXPECTED TO DEVELOP. TONIGHT...WITH NO CHANGE TO THE AIRMASS, THOUGH WINDS SHOULD VEER MORE TOWARDS THE SOUTH SLIGHTLY SOUTHEAST A BIT MORE LATER TONIGHT, FOG AND STRATUS SHOULD CONTINUE TO PLAGUE A MAJORITY OF OUR TERMINALS. THOUGHT IT WAS TOO EARLY TO BRING CONDITIONS DOWN OVERNIGHT BUT IT WOULD TAKE QUITE A BIT OF DRY AIR TO PUSH IN TO KEEP CONDITIONS VFR TONIGHT...DO NOT EXPECT THAT TO HAPPEN. OUTLOOK... MONDAY AND MONDAY NIGHT...GENERALLY VFR BUT WITH SOME LOCAL CIG/VSBY RESTRICTIONS ASSOCIATED WITH SHOWERS AND THUNDERSTORMS. TUESDAY...PREDOMINATELY VFR WITH SOME RESTRICTIONS IN SHOWERS AND THUNDERSTORMS. SOME RESTRICTIONS DUE TO FOG POSSIBLE EARLY TUESDAY MORNING. WEDNESDAY THROUGH THURSDAY...VFR. && .MARINE... SUB-ADVISORY CONDITIONS ARE EXPECTED ACROSS OUR WATERS TODAY AND TONIGHT AS WE CONTINUE WITH THE SOUTHERLY WINDS. THIS WILL HELP TO KEEP SEAS RUNNING AROUND 4 FEET EARLY THIS MORNING BUT AS THE WINDS BEGIN TO DROP OFF LATER TODAY THE SEAS WILL RELAX A BIT MORE. SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE ONCE AGAIN THIS EVENING AND TONIGHT ACROSS OUR WATERS. OUTLOOK... WINDS AND WAVES SHOULD REMAIN BELOW SCA CRITERIA THROUGH THE COMING WEEK...WITH THE EXCEPTION OF LOCALLY HIGHER WINDS AND SEAS IN THE VICINITY OF THUNDERSTORMS ON MONDAY AND POSSIBLY TUESDAY. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...NONE. NJ...NONE. DE...NONE. MD...NONE. MARINE...NONE. && SYNOPSIS...AMC NEAR TERM...HEAVENER/ROBERTSON SHORT TERM...HEAVENER LONG TERM...AMC AVIATION...AMC/HEAVENER/ROBERTSON MARINE...AMC/HEAVENER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 415 AM EDT SUN SEP 1 2013 NJZ001-007>010-012-PAZ054-055-060>062-103-105-020815- SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-CARBON-MONROE- BERKS-LEHIGH-NORTHAMPTON-WESTERN MONTGOMERY-UPPER BUCKS- 415 AM EDT SUN SEP 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...EAST CENTRAL PENNSYLVANIA...NORTHEAST PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. SOME THUNDERSTORMS MAY PRODUCE HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR DRAINAGE FLOODING INTO TONIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THUNDERSTORMS MAY PRODUCE HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR DRAINAGE FLOODING MONDAY INTO MONDAY EVENING. SOME OF THE THUNDERSTORMS COULD ALSO PRODUCE STRONG GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DEZ001>003-MDZ008-012-015-019-020-NJZ013-015>023-027-PAZ070-071-101- 102-104-106-020815- NEW CASTLE-KENT-INLAND SUSSEX-CECIL-KENT MD-QUEEN ANNES-TALBOT- CAROLINE-WESTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN- NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY- SOUTHEASTERN BURLINGTON-DELAWARE-PHILADELPHIA-WESTERN CHESTER- EASTERN CHESTER-EASTERN MONTGOMERY-LOWER BUCKS- 415 AM EDT SUN SEP 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW JERSEY...SOUTHERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THUNDERSTORMS MAY PRODUCE HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR DRAINAGE FLOODING MONDAY INTO MONDAY EVENING. SOME OF THE THUNDERSTORMS COULD ALSO PRODUCE STRONG GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NJZ014-024>026-020815- EASTERN MONMOUTH-ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC- COASTAL OCEAN- 415 AM EDT SUN SEP 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY AND SOUTHERN NEW JERSEY. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THUNDERSTORMS MAY PRODUCE HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR DRAINAGE FLOODING MONDAY INTO MONDAY EVENING. SOME OF THE THUNDERSTORMS COULD ALSO PRODUCE STRONG GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DEZ004-020815- DELAWARE BEACHES- 415 AM EDT SUN SEP 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN DELAWARE. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THUNDERSTORMS MAY PRODUCE HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR DRAINAGE FLOODING MONDAY INTO MONDAY EVENING. SOME OF THE THUNDERSTORMS COULD ALSO PRODUCE STRONG GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ430-431-450>455-020815- 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 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- 415 AM EDT SUN SEP 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND DELAWARE BAY WATERS. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. SOME GUSTY WINDS ARE POSSIBLE IN THUNDERSTORMS, MAINLY ON MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
751 AM EDT SUN SEP 1 2013
NJZ009-015-PAZ103>106-011315-
EASTERN MONTGOMERY PA-HUNTERDON NJ-LOWER BUCKS PA-MERCER NJ-
UPPER BUCKS PA-WESTERN MONTGOMERY PA-
751 AM EDT SUN SEP 1 2013
...STRONG THUNDERSTORMS WILL AFFECT CENTRAL BUCKS...CENTRAL
MONTGOMERY...HUNTERDON AND NORTHWESTERN MERCER COUNTIES...
AN AREA OF STRONG THUNDERSTORMS COVERED PORTIONS OF BUCKS AND
MONTGOMERY COUNTIES AT 747 AM EDT. THE STRONG THUNDERSTORMS WERE
GENERALLY MOVING EAST AT 15 MPH.
VERY HEAVY RAIN WILL FALL FROM THESE STRONG THUNDERSTORMS...AND WILL
CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE AREAS. ONE HOUR
RAINFALL AMOUNTS OF AN INCH ARE POSSIBLE. THE RAIN CAN CAUSE RAPID
RISES ON SMALL STREAMS AND CREEKS.
WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THESE STRONG THUNDERSTORMS.
CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STRONG
THUNDERSTORMS. DO NOT STAY IN THE OPEN NOR SEEK SHELTER UNDER TREES
WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.
LAT...LON 4051 7478 4040 7473 4033 7477 4023 7505
4018 7554 4021 7555 4026 7541 4058 7527
4061 7520 4059 7519 4068 7506 4071 7472
4064 7473 4062 7470
TFGSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
913 AM EDT SUN SEP 1 2013
NJZ008>010-012-015-011445-
HUNTERDON NJ-MERCER NJ-MIDDLESEX NJ-MORRIS NJ-SOMERSET NJ-
913 AM EDT SUN SEP 1 2013
...STRONG THUNDERSTORMS WILL AFFECT NORTHERN MIDDLESEX...NORTHWESTERN
MERCER...SOMERSET...SOUTHEASTERN HUNTERDON AND SOUTHERN MORRIS
COUNTIES...
AN AREA OF STRONG THUNDERSTORMS COVERED PORTIONS OF HUNTERDON COUNTY
AND WAS APPROACHING NORTHWEST MERCER COUNTY AT 908 AM EDT. THE
STRONG THUNDERSTORMS WERE GENERALLY MOVING NORTHEAST AT 15 TO 20 MPH.
THE HEAVY RAIN COULD AFFECT AREAS OF MIDDLESEX COUNTY THAT ALREADY
RECEIVED HEAVY RAIN OVERNIGHT.
VERY HEAVY RAIN WILL FALL FROM THESE STRONG THUNDERSTORMS...AND WILL
CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN
CAN CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS. LOCAL HOURLY
AMOUNTS COULD REACH BETWEEN ONE HALF AND ONE INCH.
WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THESE STRONG THUNDERSTORMS.
THIS OCCURRED IN THE DOYLESTOWN AREA.
CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STRONG
THUNDERSTORMS. DO NOT STAY IN THE OPEN NOR SEEK SHELTER UNDER TREES
WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.
LAT...LON 4047 7426 4024 7482 4029 7486 4034 7495
4039 7496 4041 7502 4043 7503 4046 7496
4067 7476 4078 7436 4073 7437 4068 7445
4066 7445 4067 7440 4060 7444 4061 7423
4055 7422
TFGThe Dover AFB radar (KDOX), 42 km away, was scanning. The volume nearest the first event began at 17:40 UTC.
1 funnel cloud. Local standard time, as filed.
A thunderstorm produced a funnel cloud that was seen by several eyewitnesses over a corn field near Railway Road and Delaware State Route 26 in Millville. While eyewitness accounts stated that the funnel came close to the ground, no damage was reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Delaware in 2013Every state in 2013This day in weather historyWarnings in Delaware, September 2013
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: 477583.