Alert archive / Delaware / Flash Flood Warnings in 2003

Flash Flood Warning 8, NWS Philadelphia/Mount Holly

June 21, 2003Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 21, 2003, 7:16 PM EDT for Sussex County, Delaware. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 21, 2003, 7:16 PM EDT (23:16 UTC)
Expired: Jun 21, 2003, 11:00 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Sussex County, DE

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.3 hours before the alert went out and 83 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 212318
FFWPHI
DEC005-220300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
716 PM EDT SAT JUN 21 2003

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN SUSSEX COUNTY IN SOUTHERN DELAWARE

* UNTIL 1100 PM EDT.

* AT 712 PM EDT...WEATHER SERVICE RADAR INDICATED AROUND 3.5 INCHES
  OF RAIN HAS FALLEN OVER THE PAST HOUR OVER PARTS OF THE SLAUGHTER
  CREEK BASIN. OTHER SLOW MOVING THUNDERSTORMS ARE YET TO MOVE 
  THROUGH EASTERN SUSSEX COUNTY AND ADDITIONAL HEAVY RAIN COULD
  CAUSE MORE FLASH FLOODING FARTHER SOUTHEAST INTO THE COUNTY.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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

LAT...LON 3847 7553 3846 7507 3906 7504 3889 7548

$$

TFG

1 follow-up statement

000 
WGUS71 KPHI 220114
FFSPHI
DEC005-220145-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
913 PM EDT SAT JUN 21 2003

...FLASH FLOOD WARNING FOR SUSSEX COUNTY 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 IS BEING CANCELLED.

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

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Kent	57 min
Jun 21, 6:48 PM EDT	Flash Flood Warning	PHI	Kent	2 hr
Jun 21, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	54 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.