Alert archive / Delaware / Flash Flood Warnings in 2003

Flash Flood Warning 38, NWS Philadelphia/Mount Holly

August 12, 2003Kent County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 12, 2003, 2:27 PM EDT for Kent 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 12, 2003, 2:27 PM EDT (18:27 UTC)
Expired: Aug 12, 2003, 5:30 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

County Kent County, DE

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.5 hours before the alert went out and 66 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: 591 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 796 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 121830
FFWPHI
DEC001-122130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
227 PM EDT TUE AUG 12 2003

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN KENT COUNTY IN CENTRAL DELAWARE

* UNTIL 530 PM EDT.

* AT 224 PM EDT...WEATHER SERVICE RADAR INDICATED A NEARLY 
STATIONARY THUNDERSTORM NEAR FREDERICA.  THIS STORM HAS PRODUCED 
NEARLY THREE INCHES OF RAIN IN AN HOUR. 

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL 
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER 
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

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

$$

LAT...LON 3907 7553 3897 7564 3893 7545 3900 7538

SZATKOWSKI

1 follow-up statement

000 
WGUS71 KPHI 122030
FFSPHI
DEC001-122100-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
427 PM EDT TUE AUG 12 2003

...THE FLASH FLOOD WARNING FOR KENT COUNTY HAS BEEN CANCELLED...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE RAINFALL HAS 
ENDED ACROSS THE WARNED AREA...AND THE FLOOD THREAT WAS DIMINISHING.
SOME MINOR FLOODING MAY CONTINUE...BUT THE THREAT OF SERIOUS FLOODING
IS ENDING. THUS...THE FLASH FLOOD WARNING FOR KENT COUNTY HAS 
BEEN CANCELLED.

KENT COUNTY EMERGENCY MANAGEMENT REPORTED THAT FLOODING DID OCCUR 
EARLIER THIS AFTERNOON BETWEEN FELTON AND FREDERICA IN KENT COUNTY. 

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

$$

SZATKOWSKI

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 2:02 PM EDT	Severe Thunderstorm Warning	PHI	Kent	58 min

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.