Alert archive / Pennsylvania / Flash Flood Warnings in 2008
Flash Flood Warning 10, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 14, 2008, 6:28 PM EDT for Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 14, 2008, 6:28 PM EDT (22:28 UTC)
- Expired
- Jun 14, 2008, 7:28 PM EDT
- In force
- 60 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 103 km from the middle of the area, began a volume at 22:29 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, 10.5 hours before the alert went out and 136 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
- 92 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1369 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 142230
FFWPHI
MDC015-PAC029-150230-
/O.NEW.KPHI.FF.W.0010.080614T2228Z-080615T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
628 PM EDT SAT JUN 14 2008
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WESTERN CECIL COUNTY IN NORTHEAST MARYLAND...
SOUTHWESTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 1030 PM EDT
* AT 625 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH TORRENTIAL DOWNPOURS HEADING FOR LOCATIONS
THAT HAVE ALREADY RECEIVED IN EXCESS OF TWO INCHES OF RAIN
IN EXTREME SOUTHWEST CHESTER COUNTY AND NORTHWEST CECIL COUNTY.
THE HEAVIEST RAIN HAS FALLEN OVER PARTS OF THE OCTORARO CREEK
BASIN.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MOUNT
VERNON AND GLEN ROY
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.
FLOODING IS OCCURRING OR IS IMMINENT. 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.
LAT...LON 3973 7615 3975 7610 3988 7600 3944 7594
3944 7600 3946 7602 3954 7598 3956 7599
3954 7599 3953 7600 3955 7609 3965 7617
3968 7622 3972 7623
TIME...MOT...LOC 2228Z 180DEG 0KT 3974 7604
$$
TFG1 follow-up statement
000
WGUS71 KPHI 142328
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
727 PM EDT SAT JUN 14 2008
MDC015-PAC029-142337-
/O.CAN.KPHI.FF.W.0010.000000T0000Z-080615T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-CHESTER PA-
727 PM EDT SAT JUN 14 2008
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN
CHESTER AND WESTERN CECIL COUNTIES...
THE SECOND CLUSTER OF THUNDERSTORMS WITH HEAVY RAIN MISSED THE WARNING
AREA AND FLASH FLOODING IS NO LONGER EXPECTED IN THOSE PARTS OF CECIL
AND CHESTER COUNTIES.
LAT...LON 3973 7615 3975 7610 3988 7600 3944 7594
3944 7600 3946 7602 3954 7598 3956 7599
3954 7599 3953 7600 3955 7609 3965 7617
3968 7622 3972 7623
TIME...MOT...LOC 2327Z 180DEG 0KT 3974 7604
$$
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 14, 2:23 PM EDT | Flash Flood Warning | PHI | Monroe | 3 hr |
| Jun 14, 3:02 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 58 min |
| Jun 14, 4:26 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 64 min |
| Jun 14, 4:49 PM EDT | Flash Flood Warning | PHI | Carbon | 5 hr |
| Jun 14, 5:07 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 53 min |
| Jun 14, 5:18 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 57 min |
| Jun 14, 6:15 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 75 min |
| Jun 14, 6:48 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 3 hr |
| Jun 14, 7:05 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 70 min |
| Jun 14, 7:42 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery | 63 min |
| Jun 14, 7:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Philadelphia | 79 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2008Flash Flood Warnings in Maryland, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.