Alert archive / New Jersey / Flash Flood Warnings in 2002

Flash Flood Warning 40, NWS Philadelphia/Mount Holly

March 21, 20025 counties in Pennsylvania; New Castle County, Delaware; 9 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Mar 21, 2002, 10:39 AM EST for 5 counties in Pennsylvania; New Castle County, Delaware; 9 counties in New Jersey. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 21, 2002, 10:39 AM EST (15:39 UTC)
Expired
Mar 21, 2002, 11:00 AM EST
In force
21 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties New Castle County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Ocean County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 3.7 hours before the alert went out and 95 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2002-03-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2002-03-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -94 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
1435 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-94 m²/s²
0-3 km storm-relative helicity
8 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 211542
FFWPHI
DEC003-NJC001-005-007-009-011-015-021-029-033-PAC017-029-045-091-101-
211600-

FLASH FLOOD WARNING...TEST...
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1039 AM EST THU MAR 21 2002

...THIS IS JUST A TEST....THIS IS JUST A TEST...TEST....

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* DRILL FLASH FLOOD WARNING FOR...
  MERCER COUNTY ...TEST
  BUCKS COUNTY ...TEST
  MONTGOMERY COUNTY ...TEST
  CHESTER COUNTY ...TEST
  PHILADELPHIA COUNTY ...TEST
  DELAWARE COUNTY ...TEST
  BURLINGTON COUNTY ...TEST
  CAMDEN COUNTY ...TEST
  GLOUCESTER COUNTY ...TEST
  SALEM COUNTY ...TEST
  CUMBERLAND COUNTY ...TEST
  OCEAN COUNTY ...TEST
  ATLANTIC COUNTY ...TEST
  CAPE MAY COUNTY ...TEST

* UNTIL 1100 AM EST. THIS IS JUST A TEST...

* AT 1032 AM EST...TEST FLASH FLOODING WAS REPORTED IN SOUTHEAST 
  PENNSYLVANIA AND SOUTHERN NEW JERSEY.

...THIS IS JUST A TEST...THIS IS JUST A TEST...THIS IS JUST A TEST...


$$



LAT...LON 4032 7482 3973 7432 3918 7476 4003 7580

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 21, 10:30 AM ESTFlash Flood WarningPHIBerks, Bucks, Carbon, Lehigh, Monroe, Northampton15 min

Nearby

Flash Flood Warnings in New Jersey, 2002Flash Flood Warnings in Pennsylvania, 2002Flash Flood Warnings in Delaware, 2002Every flash flood warning in 2002

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.