Alert archive / New Jersey / Flash Flood Warnings in 2002

Flash Flood Warning 39, NWS Philadelphia/Mount Holly

March 21, 20026 counties in Pennsylvania; 8 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Mar 21, 2002, 10:30 AM EST for 6 counties in Pennsylvania; 8 counties in New Jersey. It was in force for 15 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, 10:30 AM EST (15:30 UTC)
Expired
Mar 21, 2002, 10:45 AM EST
In force
15 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 3.5 hours before the alert went out and 161 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 211528
FFWPHI
NJC019-021-023-025-027-035-037-041-PAC011-017-025-077-089-095-211545-

FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1030 AM EST THU MAR 21 2002

    *** THIS MESSAGE IS FOR TEST PURPOSES ONLY ***
  * NO SEVERE WEATHER IS OCCURRING IN THE MENTIONED AREA *


THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* DRILL FLASH FLOOD WARNING FOR...
  CARBON COUNTY...TEST
  MONROE COUNTY...TEST
  BERKS COUNTY...TEST
  LEHIGH COUNTY...TEST
  NORTHAMPTON COUNTY...TEST
  SUSSEX COUNTY...TEST
  WARREN COUNTY...TEST
  HUNTERDON COUNTY...TEST
  MORRIS COUNTY...TEST
  MIDDLESEX COUNTY...TEST
  MONMOUTH COUNTY...TEST
  SOMERSET COUNTY...TEST

* UNTIL 1045 AM EST.

* AT 1020 AM EST...WEATHER SERVICE RADAR INDICATED DRILL FLASH
  FLOODING IN EAST-CENTRAL PENNSYLVANIA AND NORTHERN NEW JERSEY.  

IF THIS WERE AN ACTUAL WARNING...WE WOULD PROVIDE DETAILS OF DAMAGE 
AND SUGGEST SAFE LOCATIONS AS SHELTER.

AGAIN...THIS IS A DRILL FLASH FLOOD WRNING.  NO FLOODING IS OCCURRING
AT THIS TIME.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 21, 10:39 AM ESTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia21 min

Nearby

Flash Flood Warnings in New Jersey, 2002Flash Flood Warnings in Pennsylvania, 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.