Alert archive / Pennsylvania / Flash Flood Warnings in 2004
Flash Flood Warning 63, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 1, 2004, 12:52 PM EDT for Delaware County, Philadelphia County, Pennsylvania. 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
- Aug 1, 2004, 12:52 PM EDT (16:52 UTC)
- Expired
- Aug 1, 2004, 5:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Delaware County, PA, Philadelphia County, PA
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 4.9 hours before the alert went out and 211 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
- 1100 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 506 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KPHI 011658 FFWPHI PAC045-101-012100- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1252 PM EDT SUN AUG 1 2004 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE * FLASH FLOOD WARNING FOR... DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 500 PM EDT * AT 1246 PM EDT...ONGOING FLOODING WAS REPORTED ALONG THE DARBY AND CRUM CREEKS IN DELAWARE COUNTY AND THE WISSAHICKON CREEK IN PHILADELPHIA. ALL THE CREEKS HAVE CRESTED...BUT THE DOPPLER RADAR STORM TOTAL ESTIMATES OF 3 TO 6 INCHES HAVE TO RUN THROUGH THE STREAMS. FOLLOW THE DIRECTION OF EMERGENCY MANAGEMENT PERSONNEL IN YOUR AREA. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY OR HAVE BEEN BARRICADED. 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. FLOODING IS OCCURRING. MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES... DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM... EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. LAT...LON 3993 7548 3985 7540 4002 7503 4006 7518 $$ TFG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 7:12 AM EDT | Flash Flood Warning | PHI | Montgomery | 2 hr |
| Aug 1, 7:30 AM EDT | Flash Flood Warning | PHI | Philadelphia | 2 hr |
| Aug 1, 7:43 AM EDT | Flash Flood Warning | PHI | Bucks | 2 hr |
| Aug 1, 7:50 AM EDT | Flash Flood Warning | PHI | Chester, Delaware | 115 min |
| Aug 1, 8:01 AM EDT | Flash Flood Warning | PHI | Montgomery | 89 min |
| Aug 1, 9:08 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 1, 10:59 AM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 2 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2004Every flash flood warning in 2004
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.