Alert archive / Pennsylvania / Flash Flood Warnings in 2008
Flash Flood Warning 6, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 4, 2008, 6:50 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 4, 2008, 6:50 PM EDT (22:50 UTC)
- Expired
- Jun 4, 2008, 9:37 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 22:50 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 4, 7:30 PM EDT | FLASH FLOOD | Horsham, PA | FIRE DEPT RESCUING PEOPLE FORM A CAR ON HORSHAM RD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.8 hours before the alert went out and 115 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
- 27 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 622 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 157 m²/s²
- 0-3 km storm-relative helicity
- 221 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KPHI 042255 FFWPHI PAC017-091-050245- /O.NEW.KPHI.FF.W.0006.080604T2250Z-080605T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 650 PM EDT WED JUN 4 2008 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * FLASH FLOOD WARNING FOR... WESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 1045 PM EDT * AT 645 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED BETWEEN 1.50 AND 2.00 INCHES OF RAIN HAD FALLEN OVER PORTIONS OF WESTERN BUCKS COUNTY AND CENTRAL MONTGOMERY COUNTY. ADDITIONAL RAIN IS ON THE WAY. FLOODING OF POOR DRAINAGE AREAS CAN BE EXPECTED...ESPECIALLY NEAR HORSHAM...IVYLAND...RICHBORO... WARRINGTON AND WILLOW GROVE. LAT...LON 4034 7544 4037 7497 4013 7493 4019 7547 TIME...MOT...LOC 2250Z 296DEG 14KT 4022 7532 $$ JJM
1 follow-up statement
000 WGUS71 KPHI 050137 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 935 PM EDT WED JUN 4 2008 PAC017-091-050145- /O.CAN.KPHI.FF.W.0006.000000T0000Z-080605T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MONTGOMERY PA-BUCKS PA- 935 PM EDT WED JUN 4 2008 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN BUCKS AND CENTRAL MONTGOMERY COUNTIES... DOPPLER RADAR INDICATES THE HEAVY RAIN HAS MOVED OUT OF THE AREA FOR THE TIME BEING. THE IMMEDIATE THREAT FOR FLOODING HAS ABATED, AND SO THE FLASH FLOOD WARNING HAS BEEN CANCELLED. LAT...LON 4034 7544 4037 7497 4013 7493 4019 7547 TIME...MOT...LOC 0135Z 296DEG 14KT 3994 7457 $$ JJM
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 2:00 AM EDT | Areal Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2008Every flash flood warning in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.