Alert archive / Pennsylvania / Flash Flood Warnings in 2001
Flash Flood Warning 28, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 22, 2001, 6:48 PM EDT for Chester County, Pennsylvania. It was in force for 117 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
- Jun 22, 2001, 6:48 PM EDT (22:48 UTC)
- Expired
- Jun 22, 2001, 8:45 PM EDT
- In force
- 117 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Chester County, PA
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.8 hours before the alert went out and 64 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.
- Mixed-layer CAPE
- 578 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 563 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KPHI 222251 FFWPHI PAC029-230045- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 648 PM EDT FRI JUN 22 2001 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 845 PM EDT. * AT 645 PM EDT...WEATHER SERVICE RADAR INDICATED A STRONG AND SLOW-MOVING THUNDERSTORM OVER NORTHWESTERN CHESTER COUNTY. THIS STORM IS PRODUCING RAINFALL RATES OF UP TO THREE INCHES AN HOUR...AND WILL PRODUCE LOCALIZED FLASH FLOODING. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE TELEVISION OUTLET. $$ LAT...LON 4020 7567 4004 7561 3996 7599 4013 7599 GSS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 12:59 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Jun 22, 1:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 30 min |
| Jun 22, 1:53 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 37 min |
| Jun 22, 2:07 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 23 min |
| Jun 22, 2:12 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 33 min |
| Jun 22, 2:43 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 47 min |
| Jun 22, 3:00 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 45 min |
| Jun 22, 3:21 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Jun 22, 3:54 PM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 3 hr |
| Jun 22, 6:08 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Jun 22, 6:58 PM EDT | Flash Flood Warning | PHI | Lehigh | 2 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2001Every flash flood warning in 2001
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.