Alert archive / Delaware / Flash Flood Warnings in 2003

Flash Flood Warning 52, NWS Philadelphia/Mount Holly

September 28, 2003New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 28, 2003, 1:08 AM EDT for New Castle 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: Sep 28, 2003, 1:08 AM EDT (05:08 UTC)
Expired: Sep 28, 2003, 5:15 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County New Castle County, DE

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 5.1 hours before the alert went out and 172 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: 615 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 280511
FFWPHI
DEC003-280915-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
108 AM EDT SUN SEP 28 2003

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 515 AM EDT.

* AT 107 AM EDT...WEATHER SERVICE RADAR INDICATED ONE TO TWO
  INCHES OF RAIN HAS FALLEN IN A STRIPE ACROSS NORTHERN NEW 
  CASTLE COUNTY FROM NEAR WILMINGTON SOUTHWEST TO JUST SOUTH 
  OF NEWARK. THUNDERSTORMS WITH HEAVY RAIN CONTINUE TO REFORM
  OVER NORTHERN CHESAPEAKE BAY AND SHOULD MOVE OVER THE COUNTY
  DURING THE NEXT ONE TO TWO HOURS. THE CHRISTINA RIVER IS 
  EXPECTED TO BEGIN FLOODING AFTER 2 AM THIS MORNING. 

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 3981 7549 3952 7559 3949 7577 3964 7578
          3977 7571

$$

TFG

1 follow-up statement

000 
WGUS71 KPHI 280748
FFSPHI
DEC003-280945-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
346 AM EDT SUN SEP 28 2003

...THE FLASH FLOOD WARNING FOR NORTHERN NEW CASTLE COUNTY HAS BEEN 
CANCELLED...

THE HEAVY RAIN HAS LONG ENDED AND ANY SMALL CREEKS THAT DID FLOOD 
SHOULD BE BACK WITHIN BANKFULL AT THIS TIME. THE CHRISTINA RIVER 
CRESTED BELOW FLOOD STAGE. PLEASE BE WARY FOR THE POSSIBILITY OF 
SOME LEFTOVER PONDING OF WATER IN POOR DRAINAGE LOCATIONS.

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

$$

TFG

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.