Alert archive / Delaware / Flash Flood Warnings in 2003

Flash Flood Warning 35, NWS Philadelphia/Mount Holly

August 11, 2003New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 11, 2003, 4:15 PM EDT for New Castle County, Delaware. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 11, 2003, 4:15 PM EDT (20:15 UTC)
Expired: Aug 11, 2003, 7:15 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

County New Castle County, DE

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.3 hours before the alert went out and 41 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 123 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 875 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS51 KPHI 112017
FFWPHI
DEC003-112315-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
415 PM EDT MON AUG 11 2003

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE

* UNTIL 715 PM EDT.

* AT 413 PM EDT...WEATHER SERVICE RADAR INDICATED AN AREA OF SHOWERS 
AND THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL OVER NORTHERN NEW 
CASTLE COUNTY.  

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE FLASH FLOODING OF 
SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. 

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE
YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER
DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES
CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER
GROUND.

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE
TELEVISION OUTLET.

$$

LAT...LON 3979 7551 3948 7562 3950 7577 3980 7564

SZATKOWSKI

1 follow-up statement

000 
WGUS71 KPHI 112149
FFSPHI
DEC003-112315-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
541 PM EDT MON AUG 11 2003

...A FLASH FLOOD WARNING CONTINUES FOR NORTHERN NEW CASTLE COUNTY...

AT 540 PM...DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS 
CONTINUED TO PRODUCE HEAVY RAINFALL OVER PORTIONS OF NORTHERN NEW 
CASTLE COUNTY. SIGNIFICANT FLASH FLOODING WAS REPORTED ON FAUKLAND 
ROAD WEST OF ROUTE 141...NEAR RED CLAY CREEK.  WATER WAS REPORTED 
RISING RAPIDLY AND APPROACHING NEARBY RESIDENCES. 

DOPPLER RADAR ESTIMATES INDICATES THE HARDEST HIT AREAS HAVE HAD 
OVER FOUR INCHES OF RAIN IN THE PAST TWO HOURS 

THIS IS A LIFE THREATENING SITUATION.  IF YOU ARE IN AN AREA PRONE 
TO FLOODING...MOVE TO HIGHER GROUND.  

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER MEDIA FOR THE LATEST SEVERE
WEATHER INFORMATION.

REPEATING...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN NEW 
CASTLE COUNTY UNTIL 715 PM EDT.

$$

SZATKOWSKI

Nearby

Flash Flood Warnings in Delaware, 2003 Every flash flood warning in 2003

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.