Alert archive / Pennsylvania / Flash Flood Warnings in 2004
Flash Flood Warning 59, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 1, 2004, 9:08 AM EDT for 4 counties in Pennsylvania. It was in force for 2 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, 9:08 AM EDT (13:08 UTC)
- Expired
- Aug 1, 2004, 11:15 AM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 95 km from the middle of the area, began a volume at 13:04 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 1.1 hours before the alert went out and 209 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 011312 FFWPHI PAC029-045-091-101-011515- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 908 AM EDT SUN AUG 1 2004 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE * FLASH FLOOD WARNING FOR... EASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 1115 AM EDT * AT 905 AM EDT...ONGOING FLOODING WAS OCCURRING ALONG THE MANATAWNY CREEK IN MONTGOMERY COUNTY...WISSAHICKON CREEK IN PHILADELPHIA...VALLEY CREEK IN CHESTER COUNTY AND THE CRUM CREEK IN DELAWARE COUNTY. IN ADDITION OTHER SMALLER CREEKS ARE LIKELY OUT OF THEIR BANKS. THE HEAVIEST RAIN IS OVER AND THE RUNOFF FROM THE HEAVY RAIN HAS TO MOVE THROUGH THE AREA STREAMS. EXCESSIVE RUNOFF FROM HEAVY RAINFALL HAS CAUSED FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. 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. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE TELEVISION OUTLET. LAT...LON 4019 7573 3983 7556 4006 7498 4038 7548 $$ 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, 10:59 AM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 1, 12:52 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 4 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; radar from the NEXRAD Level II archive.