Alert archive / Pennsylvania / Flash Flood Warnings in 2009
Flash Flood Warning 10, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 13, 2009, 4:07 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 6 hr. 2 reports 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 13, 2009, 4:07 PM EDT (20:07 UTC)
- Expired
- Jun 13, 2009, 10:00 PM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 51 km from the middle of the area, began a volume at 20:09 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 13, 5:55 PM EDT | FLASH FLOOD | Ambler, PA | BASEMENTS AND ROADS FLOODED IN ALBER. |
| Jun 13, 9:20 PM EDT | HEAVY RAIN 0 | Willow Grove, PA | 3.78 INCHES STORM TOTAL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.1 hours before the alert went out and 249 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
- 18 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 989 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 38 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 132007
FFWPHI
PAC017-091-101-140200-
/O.NEW.KPHI.FF.W.0010.090613T2007Z-090614T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
407 PM EDT SAT JUN 13 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF WILLOW GROVE...
NORTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF PHILADELPHIA...
* UNTIL 1000 PM EDT
* AT 401 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH TORRENTIAL RAINFALL CONTINUING OVER BUCKS
AND MONTGOMERY COUNTIES. FLOODING IS OCCURRING ALONG THE
LITTLE NESHAMINY CREEK. DOPPLER RADAR STORM TOTAL ESTIMATES
REACHED 5.31 INCHES IN WARMINSTER TOWNSHIP IN BUCKS COUNTY.
NUMEROUS ROADWAYS ARE CLOSED IN WARMINSTER, WARRINGTON AND
HORSHAM COUNTIES. A SPOTTER JUST REPORTED OVER AN INCH OF RAIN
IN 10 MINUTES IN AMBLER IN MONTGOMERY COUNTY.
RUNOFF FROM THE HEAVY RAIN IN MONTGOMERY COUNTY
MIGHT CAUSE FLOODING ALONG THE WISSAHICKON AND PENNYPACK CREEKS
ALL THE WAY INTO PHILADELPHIA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
GARDENVILLE...FRICKS...WOODSIDE...SPRING MOUNT...SOUDERTON...
RICHBORO...NEWTOWN...LEVITTOWN...LANSDALE...LANGHORNE...IVYLAND...
FEASTERVILLE...DUBLIN...DOYLESTOWN...COLLEGEVILLE...CHALFONT AND
AMBLER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.
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 4012 7477 4012 7483 4007 7488 4006 7495
3997 7509 3998 7511 3995 7515 4025 7563
4042 7505 4031 7491 4030 7487 4024 7484
4017 7473 4015 7472
$$
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 2:27 PM EDT | Areal Flood Advisory | PHI | Chester | 4 hr |
| Jun 13, 2:32 PM EDT | Flash Flood Warning | PHI | Bucks | 2 hr |
| Jun 13, 2:33 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 112 min |
| Jun 13, 2:57 PM EDT | Flash Flood Warning | PHI | Montgomery | 2 hr |
| Jun 13, 3:17 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Jun 13, 4:59 PM EDT | Areal Flood Advisory | PHI | Chester | 4 hr |
| Jun 13, 5:16 PM EDT | River Flood Warning | PHI | Bucks | 13 hr |
| Jun 13, 6:06 PM EDT | Flash Flood Warning | PHI | Chester | 2 hr |
| Jun 13, 6:39 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 66 min |
| Jun 13, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 61 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.