A low pressure system that formed on a frontal boundary helped produce showers and thunderstorms with very heavy downpours and led to flooding and flash flooding in Delaware. The heaviest rain fell during the first half of the day in Sussex County, into the afternoon in Kent County and into the evening in New Castle County.
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 low pressure system that formed on a frontal boundary helped produce showers and thunderstorms with very heavy downpours and led to flooding and flash flooding in Delaware. The heaviest rain fell during the first half of the day in Sussex County, into the afternoon in Kent County and into the evening in New Castle County. About 40 roadways were flooded and closed in Kent and Sussex Counties. While nearly the whole state received an inch of rain, sections of Kent and Sussex Counties received 4 to 8 inches and these locations had the worst flash flooding.
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 12, 11:38 AM EST, 32 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1238 PM EDT FRI JUL 12 2013
.SYNOPSIS...
A FRONTAL BOUNDARY WILL REMAIN NEARBY THROUGH TODAY, STALLING
JUST TO OUR SOUTH AND EAST. THIS FRONT WILL THEN RETROGRADE
WESTWARD AND DISSIPATE OVER THE WEEKEND AS BERMUDA HIGH PRESSURE
ACROSS THE WESTERN ATLANTIC BUILDS BACK INTO OUR REGION. THIS HIGH
PRESSURE WILL INFLUENCE OUR WEATHER THROUGH THE END OF NEXT WEEK.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
AN AREA OF RAIN WITH SOME MODERATE TO HEAVY RAINFALL COVERED MUCH
OF DELAWARE BAY, DELAWARE AND NORTHEASTERN MARYLAND AROUND 1230
PM. THE PRECIPITATION DEVELOPED DURING THE NIGHT IN THE VICINITY
OF A SLOW MOVING FRONTAL BOUNDARY. AS WEAK LOW PRESSURE DRIFTS
NORTHEASTWARD ALONG THE FRONT, THE AREA OF PRECIPITATION IS
EXPECTED TO EXPAND SLOW TO THE NORTHWEST AND NORTH THROUGH THE
DAY.
BEING THAT TODAY'S CONVECTION WILL REMAIN LOW TOPPED, WE ARE NOT
ANTICIPATING A GREAT DEAL OF LIGHTNING, JUST A FEW STRIKES FROM
TIME TO TIME.
RADAR HAS INDICATED MAINLY 1 TO 3 INCHES OF RAIN IN HEAVIER BANDS
AND AREAS. HOWEVER, LOCALLY HIGHER AMOUNTS WERE INDICATED ON KENT
ISLAND IN MARYLAND WITH TOTALS POSSIBLY IN EXCESS OF 5 INCHES.
WHILE LOCATIONS ON THE COASTAL PLAIN SHOULD BE ABLE TO HANDLE THE
1 TO 3 INCH RAINFALL AMOUNTS WITH LITTLE PROBLEM, WE CONTINUE TO
BE CONCERNED ABOUT THE POTENTIAL FOR THOSE AMOUNTS ALONG THE
URBANIZED INTERSTATE 95 CORRIDOR UP TO ABOUT PHILADELPHIA. AS A
RESULT, THE FLASH FLOOD WATCH REMAINS IN PLACE.
A NORTHEASTERLY WIND ALONG WITH AN OVERCAST SKY WILL KEEP
TEMPERATURES FROM GETTING MUCH ABOVE 80 DEGREES IN OUR REGION.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM SATURDAY/...
HEAVY RAINS APPEAR LIKELY FOR A PORTION OF OUR AREA...AT LEAST
FOR THIS EVENING. IT MAY TURN OUT THAT MOST OF THE LIFT AND THREAT
FOR HEAVY RAIN ENDS BY 06Z? MODELS DIFFER ON THEIR SOLNS.
POTENTIAL EXISTS FOR NARROW BANDS OF VERY HEAVY SHOWERS AND
ISOLATED TSTMS AT LEAST EARLY TONIGHT AS THE WARM FRONT TRIES TO
LIFT NORTH AND WIND FIELDS BETWEEN 925 MB AND 700MB BECOME
CONCENTRATED- NOSED N-S INTO OUR AREA FROM VA. PWAT CONTINUES NEAR
2 INCHES THROUGH THE NIGHT ALONG I95 FROM MD TO CENTRAL NJ. PATCHY
FOG ALONG THE WARM FRONT LATE...ESPECIALLY KPHL-KACY SOUTHWARD.
TEMPS/WINDS/DEWS ARE 50 50 BLENDED 00Z/12 NAM/GFS MOS.
&&
.LONG TERM /SATURDAY THROUGH THURSDAY/...
TO START THE LONG TERM, A STALLED FRONTAL BOUNDARY IS FORECAST TO
BE OVER OR JUST TO THE SOUTH AND EAST OF OUR REGION EARLY
SATURDAY. MODEL GUIDANCE SHOWS THIS BOUNDARY BEING PUSHED WESTWARD
THROUGH THE COURSE OF THE DAY AS BERMUDA HIGH PRESSURE OVER THE
WESTERN ATLANTIC OCEAN RETROGRADES WESTWARD TO THE EASTERN
SEABOARD. THE FRONTAL BOUNDARY IS EXPECTED TO DISSIPATE AS IT IS
PUSHED WESTWARD, WITH THE BERMUDA HIGH SPREADING ACROSS THE MID
ATLANTIC STATES THROUGH THE REMAINDER OF THE WEEKEND. ALOFT, A
MID-LEVEL HIGH ALSO SPREADS OVER THE REGION WITH INCREASING
THICKNESSES, AS A MID LEVEL CUT-OFF LOW IS PUSHED SOUTHWEST AND
AWAY FROM THE REGION, THROUGH THE TENNESSEE VALLEY AND ACROSS THE
SOUTHERN PLAINS. THIS OVERALL PATTERN THEN LOOKS TO HOLD ON
THROUGH THE MAJORITY OF THE UPCOMING WORK WEEK, WITH A SURFACE/MID
LEVEL HIGH ACROSS THE REGION; ALTHOUGH, THE FLOW ALOFT DOES BECOME
MORE ZONAL TOWARD THE END OF NEXT WEEK.
WITH THE BERMUDA HIGH THE MAIN FEATURE INFLUENCING OUR SENSIBLE
WEATHER FROM LATE THIS WEEKEND AND INTO NEXT WEEK, A WARM AND
MUGGY AIR MASS WILL BE IN PLACE, WITH DEWPOINTS RISING BACK INTO
THE LOWER AND PERHAPS MID 70S ACROSS THE REGION THROUGH MID-WEEK.
TEMPERATURES WILL ALSO BE ON THE RISE INTO NEXT WEEK, WITH
WEDNESDAY AND THURSDAY PERHAPS BEING THE WARMEST DAYS, AS
850/925MB MODEL TEMPS SUGGEST HIGHS PEAKING IN THE LOWER TO
PERHAPS MID 90S. IN ADDITION, THIS PATTERN ALSO SUPPORTS DIURNALLY
DRIVEN CONVECTION, AS DAYTIME HEATING DESTABILIZES THE ATMOSPHERE
AND YIELDS DAILY SCATTERED SHOWERS AND THUNDERSTORMS.
&&
.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY AND SURROUNDING AREAS.
GENERAL MVFR CIGS THIS AFTN KPHL-KTTN SOUTH AND EAST AS SHOWERS
TEND TO INCREASE IN COVERAGE WITH ISOLATED EMBEDDED TSTMS. VSBY
RESTRICTION BRIEFLY TO 3 MI OR LESS IN HEAVY SHOWERS.
FURTHER N VCNTY KABE AND KRDG...VFR CIGS EXPECTED MOST OF THE
DAY.
N-NE WIND WITH GUSTS INCREASING TO 20 KT IN THE AFTN.
TONIGHT...WIDESPREAD CIGS 500-1500 FT AS A WARM FRONT LIFTS
NORTH. SCT HEAVY SHOWERS AND ISOLATED EMBEDDED TSTMS. VSBY
RESTRICTION TO 1 MI POSSIBLY IN SHOWERS AND OR PATCHY FOG.
OUTLOOK...
SATURDAY AND SUNDAY...MOSTLY VFR CONDITIONS. SCATTERED
SHWRS/TSTORMS COULD PRODUCE LOCALLY REDUCED CIGS/VSBYS TO MVFR OR
LOWER.
MONDAY AND TUESDAY...MAINLY VFR CONDITIONS. ISOLATED
SHWRS/TSTORMS EACH AFTN/EVE COULD PRODUCE LOCAL MVFR OR LOWER
CONDITIONS.
&&
.MARINE...
SCA HEADLINE FOR MUCH OF THE NJ COAST THIS AFTN/EVE. MARGINAL
20-25 KT NE WIND GUSTS AND 5 FT SEAS.
WE MAY NEED TO EXTEND THE HEADLINE DOWN TO FAR S NJ AND THE DE
ATLC COASTAL WATERS FOR TONIGHT BUT ATTM DID NOT HAVE CONFIDENCE
IN WAA SEAS BUILDING TO 5 FT THERE. CAPPED THE SEAS TONIGHT AT 5
FT DESPITE SOME GUIDANCE OFFERING 6 FT.
OUTLOOK...
FOR THE MOST PART, SUB-SCA CONDITIONS ARE EXPECTED FOR OUR
COASTAL WATERS AND DELAWARE BAY THROUGH THE WEEKEND AND EARLY NEXT
WEEK. THE POSSIBILITY DOES EXIST, HOWEVER, FOR SEAS AROUND 5 FEET
FOR OUR COASTAL WATERS EARLY SATURDAY WITH A TIGHTENED GRADIENT
ACROSS THE AREA, AS A STALLED FRONTAL BOUNDARY REMAINS NEARBY.
THIS BOUNDARY IS EXPECTED TO MOVE WESTWARD AND DISSIPATE, ALLOWING
THE GRADIENT TO RELAX LATER SATURDAY.
IN ADDITION THIS WEEKEND AND EARLY NEXT WEEK, SCATTERED SHOWERS
AND TSTORMS ARE EXPECTED EACH AFTERNOON AND EVENING WHICH COULD
CAUSE REDUCED VISIBILITIES AND LOCALLY GUSTY WINDS.
&&
.HYDROLOGY...
AS OF MIDDAY, FLOOD ADVISORIES COVERED MUCH OF DELAWARE AND
NORTHEASTERN MARYLAND ALONG WITH PARTS OF THE PENNSYLVANIA
COUNTIES OF DELAWARE, CHESTER AND MONTGOMERY. FLASH FLOOD WARNINGS
CONTINUED FOR PARTS OF DELAWARE COUNTY IN PENNSYLVANIA AND FOR
PARTS OF TALBOT AND CAROLINE COUNTIES IN MARYLAND.
PWAT 2 INCHES MOVES NORTH TO I95-195 THIS AFTN AND REMAINS AXISED
THERE THROUGH TONIGHT. REFERENCE NEAR AND SHORT TERM SECTIONS FOR
MORE DETAILS.
WE DID NOTE THAT THIS MORNINGS FF RAINS WERE JUST N OF A WEAK
SFC LOW. WE MAY NOT HAVE THAT FEATURE IN OUR AREA LATE TODAY BUT
THERE SHOULD BE A STRONG SFC CNV ZONE DEVELOPING JUST SE OF I95.
&&
.RIP CURRENTS...
THERE IS A LOW RISK FOR ENHANCED RIP CURRENT ACTIVITY TODAY ALONG
THE NEW JERSEY AND DELAWARE COASTS. SMALL CHC THIS RISK NEEDS TO
BE RAISED TO MDT THIS AFTN DEPENDENT ON HOW STRONG THE ONSHORE
FLOW AND BUILDING SHORT PERIOD SEAS.
&&
.CLIMATE...
FIRST 11 DAYS AVERAGING FROM AROUND 4 DEGS ABOVE NORMAL VCNTY
KPHL-KACY TO BETWEEN 5 AND 6 DEGS ABOVE NORMAL ELSEWHERE IN OUR
AREA AS NIGHTS HAVE BEEN QUITE MILD.
WITH A HEAT WAVE POSSIBLE NEXT WEEK...POSITIVE DEPARTURES FROM
NORMAL SHOULD INCREASE THIS COMING WEEK OF THE 15TH-19TH.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR PAZ070-071-101-102-
104.
NJ...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR NJZ016>018.
DE...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR DEZ001>004.
MD...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR MDZ008-012-015-019-
020.
MARINE...SMALL CRAFT ADVISORY UNTIL 2 AM EDT SATURDAY FOR ANZ450>452.
&&
SYNOPSIS...KLINE
NEAR TERM...IOVINO
SHORT TERM...DRAG
LONG TERM...KLINE
AVIATION...DRAG/KLINE
MARINE...DRAG/KLINE
HYDROLOGY...DRAG
RIP CURRENTS...DRAG
CLIMATE...DRAGHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1104 AM EDT FRI JUL 12 2013 NJZ015-019-027-PAZ103-105-106-131515- MERCER-NORTHWESTERN BURLINGTON-SOUTHEASTERN BURLINGTON- WESTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS- 1104 AM EDT FRI JUL 12 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...SOUTHERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. A HEAT WAVE IS PROBABLE BEGINNING SUNDAY OR MONDAY AND LASTING THROUGH THE END OF NEXT WEEK. HEAT INDICES MAY APPROACH 100 DEGREES, ESPECIALLY DURING THE MIDDLE OF THE WORK WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DEZ001-NJZ017-018-PAZ070-071-101-102-104-131515- NEW CASTLE-GLOUCESTER-CAMDEN-DELAWARE-PHILADELPHIA-WESTERN CHESTER- EASTERN CHESTER-EASTERN MONTGOMERY- 1104 AM EDT FRI JUL 12 2013 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN DELAWARE...SOUTHERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND 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. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. A HEAT WAVE IS PROBABLE BEGINNING SUNDAY OR MONDAY AND LASTING THROUGH THE END OF NEXT WEEK. HEAT INDICES MAY APPROACH 100 DEGREES, ESPECIALLY DURING THE MIDDLE OF THE WORK WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NJZ021>024-131515- CUMBERLAND-ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY- 1104 AM EDT FRI JUL 12 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN NEW JERSEY. .DAY ONE...THIS AFTERNOON AND TONIGHT. BRIEF HEAVY SHOWERS AND THUNDERSTORMS MAY PRODUCE POOR DRAINAGE FLOODING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. A HEAT WAVE IS PROBABLE BEGINNING SUNDAY OR MONDAY AND LASTING THROUGH THE END OF NEXT WEEK. HEAT INDICES MAY APPROACH 100 DEGREES, ESPECIALLY DURING THE MIDDLE OF THE WORK WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DEZ002>004-MDZ008-012-015-019-020-NJZ016-131515- KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD-QUEEN ANNES-TALBOT- CAROLINE-SALEM- 1104 AM EDT FRI JUL 12 2013 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND AND SOUTHERN NEW JERSEY. .DAY ONE...THIS AFTERNOON AND 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. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. A HEAT WAVE IS PROBABLE BEGINNING SUNDAY OR MONDAY AND LASTING THROUGH THE END OF NEXT WEEK. HEAT INDICES MAY APPROACH 100 DEGREES, ESPECIALLY DURING THE MIDDLE OF THE WORK WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NJZ001-007>010-012>014-020-026-PAZ060>062-131515- SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH- EASTERN MONMOUTH-OCEAN-COASTAL OCEAN-BERKS-LEHIGH-NORTHAMPTON- 1104 AM EDT FRI JUL 12 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...SOUTHERN NEW JERSEY AND EAST CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. A HEAT WAVE IS PROBABLE BEGINNING SUNDAY OR MONDAY AND LASTING THROUGH THE END OF NEXT WEEK. HEAT INDICES MAY REACH THE UPPER 90S TO 100 DEGREES, ESPECIALLY DURING THE MIDDLE OF THE WORK WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ054-055-131515- CARBON-MONROE- 1104 AM EDT FRI JUL 12 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ430-431-450>455-131515- 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- 1104 AM EDT FRI JUL 12 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND DELAWARE BAY WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
817 AM EDT FRI JUL 12 2013
MDZ012-015-019-121300-
KENT MD-QUEEN ANNE'S MD-TALBOT MD-
817 AM EDT FRI JUL 12 2013
...STRONG THUNDERSTORMS WILL AFFECT NORTHERN TALBOT...SOUTHWESTERN
KENT AND WESTERN QUEEN ANNE'S COUNTIES...
AN AREA OF STRONG THUNDERSTORMS COVERED PORTIONS OF KENT...QUEEN
ANNE'S AND TALBOT COUNTIES AT 815 AM EDT. THE STRONG THUNDERSTORMS
WERE GENERALLY MOVING WEST AT 30 MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STRONG THUNDERSTORMS.
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.
LAT...LON 3887 7626 3881 7621 3882 7620 3894 7624
3890 7624 3893 7628 3889 7627 3891 7632
3883 7638 3904 7632 3905 7631 3899 7627
3900 7618 3903 7625 3918 7628 3924 7612
3895 7594 3888 7594 3874 7637 3876 7639
MEOLAThe Dover AFB radar (KDOX), 33 km away, was scanning. The volume nearest the first event began at 17:09 UTC.
7 flash flood, 1 flood. Local standard time, as filed.
Thunderstorms with very heavy rain led to flash flooding in the Long Neck area of Indian River Hundred. Flood waters reached a foot deep on roadways. Event precipitation totals included 8.38 inches in Long Neck.
Thunderstorms with heavy rain caused flash flooding of roadways and small streams and eventually flooding along the Saint Jones River in central Kent County. In Dover, several vehicles became stranded in flood waters as numerous roadways flooded. Several stranded motorists had to abandon their vehicles. The water was also several feet deep at the Kent General Hospital in Dover. The Little Creek in Port Mahon flooded and shut down Main Street and Delaware State Route 9. Numerous basements were flooded. Event precipitation totals included 5.46 inches in Dover, 3.49 inches in Sandtown, 3.45 inches at the Dover Air Force Base and 2.46 inches in Smyrna.
Thunderstorms with very heavy rain led to flash flooding from Selbyville east in southern Sussex County. A few roads were closed and sections of Lighthouse and Sand Cove Roads collapsed. Event precipitation totals included 5.50 inches in Selbyville.
Thunderstorms with torrential downpours caused flash flooding from Millville and Oceanview east to Bethany Beach. Water rescues were performed, but no serious injuries were reported. In Bethany Beach, Hollywood Street and Pennsylvania Avenuie were flooded as people resorted to kayaking to move around. Event precipitation totals included 6.62 inches in Bethany Beach.
Thunderstorms with heavy rain caused flash flooding of roadways and small streams in and around Frankford. Event precipitation totals included 7.05 inches in Frankford.
Thunderstorms with heavy rain caused flash flooding of roadways and small streams from Dagsboro east along the southern shore of the Indian River Bay. High water was reported on Vines Creek Road, Warren Wingate Lane, Holts Landing Road and Waltersbluff Road.
Thunderstorms with heavy rain caused flash flooding of roadways and small streams from Dagsboro northwestward toward Georgetown. High water was reported on Hardscrabble Road (Delaware State Route 20), Shortly Road, Kendall Street and Laurel Road (Delaware State Route 24). Event precipitation totals included 4.20 inches in Stockley and 3.70 inches in Georgetown.
Runoff from the heavy rain caused flooding along the Saint Jones River twice on the 12th and 13th. The Saint Jones River in Dover was above its 6 foot flood stage from 542 p.m. EDT through 730 p.m. EDT on the 12th and again from 1254 a.m. EDT through 637 p.m. EDT on the 13th. Its highest crest was 6.80 feet at 715 a.m. EDT on the 13th.
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, July 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: 467613, 467673, 467634, 467636, 467658, 467663, 467670, 471710.