Alert archive / Pennsylvania / Flash Flood Warnings in 2009
Flash Flood Warning 12, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 30, 2009, 3:13 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 114 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 30, 2009, 3:13 PM EDT (19:13 UTC)
- Expired
- Jun 30, 2009, 5:07 PM EDT
- In force
- 114 min
- 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), 78 km from the middle of the area, began a volume at 19:15 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.2 hours before the alert went out and 118 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
- 161 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1704 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 301913
FFWPHI
PAC017-091-302315-
/O.NEW.KPHI.FF.W.0012.090630T1913Z-090630T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
313 PM EDT TUE JUN 30 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 715 PM EDT
* AT 311 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
TORRENTIAL DOWNPOURS WITH THUNDERSTORMS OVER CENTRAL BUCKS AND
MONTGOMERY COUNTIES. IN ADDITION TO FLOODING, THE HEAVY DOWNPOURS
WILL MAKE IT EASIER FOR TREES TO BE KNOCKED ESPECIALLY BECAUSE
OF ALL THE RAIN THIS PAST MONTH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TINICUM...
REVERE...PIPERSVILLE...OTTSVILLE...GARDENVILLE...FRICKS...
ERWINNA...BEDMINSTER...SOUDERTON...QUAKERTOWN...PERKASIE...NEW
HOPE...DUBLIN AND DOYLESTOWN
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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. MOVE TO HIGHER GROUND.
&&
LAT...LON 4007 7538 4007 7541 4010 7543 4009 7545
4024 7556 4043 7540 4056 7511 4050 7506
4042 7506 4040 7502 4041 7497 4034 7495
4029 7487
$$
TFG1 follow-up statement
000
WGUS71 KPHI 302107
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
507 PM EDT TUE JUN 30 2009
PAC017-091-302117-
/O.CAN.KPHI.FF.W.0012.000000T0000Z-090630T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONTGOMERY PA-BUCKS PA-
507 PM EDT TUE JUN 30 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR BUCKS AND
MONTGOMERY COUNTIES...
THE HEAVY RAIN AND FLOODING HAS ENDED ACROSS BUCKS AND MONTGOMERY
COUNTIES.
LAT...LON 4007 7538 4007 7541 4010 7543 4009 7545
4024 7556 4043 7540 4056 7511 4050 7506
4042 7506 4040 7502 4041 7497 4034 7495
4029 7487
$$
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 1:15 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 75 min |
| Jun 30, 2:31 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 44 min |
| Jun 30, 2:51 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 54 min |
| Jun 30, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 63 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2009Every flash flood warning in 2009
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.