Alert archive / Pennsylvania / Flash Flood Warnings in 2009
Flash Flood Warning 67, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Oct 24, 2009, 8:01 PM EDT for Bucks County, Philadelphia County, Pennsylvania. It was in force for 4 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
- Oct 24, 2009, 8:01 PM EDT (00:01 UTC)
- Expired
- Oct 25, 2009, 12:00 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bucks County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 58 km from the middle of the area, began a volume at 00:04 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
Brookhaven, NY (KOKX), launched 00:00Z, 0.0 hours before the alert went out and 203 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
- 534 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 447 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 462 m²/s²
- 0-3 km storm-relative helicity
- 486 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 11.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 250001
FFWPHI
PAC017-101-250400-
/O.NEW.KPHI.FF.W.0067.091025T0001Z-091025T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
801 PM EDT SAT OCT 24 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF PHILADELPHIA...
* UNTIL MIDNIGHT EDT
* AT 758 PM EDT...POOR DRAINAGE FLOODING WAS REPORTED IN BUCKS
COUNTY AND THE FRANKFORD CREEK WAS FLOODING IN PHILADELPHIA.
THE HEAVIEST RAIN HAS MOVED OUT OF THE AREA, BUT POOR DRAINAGE
WILL PERSIST. SIGNIFICANT BUT WITHIN BANKFULL RISES ARE EXPECTED
ALONG THE MAIN STEM OF THE NESHAMINY CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4007 7492 4006 7495 4003 7498 3996 7513
4003 7519 4008 7519 4005 7512 4013 7502
4022 7517 4024 7520 4026 7520 4040 7503
4016 7477
$$
TFG3 follow-up statements
215
WGUS51 KPHI 250005 CCA
FFWPHI
PAC017-101-250400-
/O.COR.KPHI.FF.W.0067.091025T0001Z-091025T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
801 PM EDT SAT OCT 24 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF PHILADELPHIA...
* UNTIL MIDNIGHT EDT
* AT 758 PM EDT...POOR DRAINAGE FLOODING WAS REPORTED IN BUCKS
COUNTY AND THE FRANKFORD CREEK WAS FLOODING IN PHILADELPHIA.
THE HEAVIEST RAIN HAS MOVED OUT OF THE AREA, BUT POOR DRAINAGE
FLOODING WILL PERSIST AS WELL AS FLOODING ALONG SOME OF THE SMALLER
STREAMS. SIGNIFICANT BUT WITHIN BANKFULL RISES ARE EXPECTED
ALONG THE MAIN STEM OF THE NESHAMINY CREEK. IF THIS PROJECTION
CHANGES, AN UPDATED STATEMENT WILL BE ISSUED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4007 7492 4006 7495 4003 7498 3996 7513
4003 7519 4008 7519 4005 7512 4013 7502
4022 7517 4024 7520 4026 7520 4040 7503
4016 7477
$$
TFG000
WGUS71 KPHI 250104
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
904 PM EDT SAT OCT 24 2009
PAC101-250111-
/O.CAN.KPHI.FF.W.0067.000000T0000Z-091025T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
904 PM EDT SAT OCT 24 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
PHILADELPHIA COUNTY...
THE FRANKFORD CREEK WAS NO LONGER FLOODING. PLEASE REFER TO THE
FLOOD WARNING STATEMENT CONCERNING FLOODING ALONG THE WISSAHICKON
CREEK.
LAT...LON 4006 7495 4003 7498 4004 7499 4008 7497
4011 7497 4013 7499 4014 7504 4024 7520
4026 7520 4040 7503 4016 7477
$$
PAC017-250400-
/O.CON.KPHI.FF.W.0067.000000T0000Z-091025T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKS PA-
904 PM EDT SAT OCT 24 2009
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
SOUTHEASTERN BUCKS COUNTY...
AT 900 PM EDT...THUNDERSTORMS THAT PRODUCED FLASH FLOODING WERE ALL
IN NEW JERSEY. ANY SMALL CREAK AND POOR DRAINAGE FLOODING SHOULD
CONTINUE TO DECREASE ACROSS THE COUNTY. FLOODING IS NOT EXPECTED
ALONG THE MAIN STEM OF THE NESHAMINY CREEK.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WOODSIDE...TULLYTOWN...RICHBORO...NEWTOWN...LEVITTOWN...LANGHORNE...
IVYLAND...FEASTERVILLE AND DOYLESTOWN
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4006 7495 4003 7498 4004 7499 4008 7497
4011 7497 4013 7499 4014 7504 4024 7520
4026 7520 4040 7503 4016 7477
$$
TFG000
WGUS71 KPHI 250116
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
916 PM EDT SAT OCT 24 2009
PAC017-250400-
/O.CON.KPHI.FF.W.0067.000000T0000Z-091025T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKS PA-
916 PM EDT SAT OCT 24 2009
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
SOUTHEASTERN BUCKS COUNTY...
AT 908 PM EDT...THE HEAVY RAIN IS OVER, BUT RISES ARE CONTINUING ON
SOME AREA STREAMS. THE NESHAMINY CREEK AT PENNS PARK IS CONTINUING
TO RISE AND THIS INCREASES THE CHANCES FOR SOME MAIN STEM FLOODING
FARTHER DOWNSTREAM ON THE NESHAMINY CREEK AT LANGHORNE. PLEASE LOOK
FOR A POSSIBLE FLOOD WARNING FOR THE NESHAMINY CREEK.
ELSEWHERE POOR DRAINAGE FLOODING WILL CONTINUE TO RECEDE AS THE
HEAVY RAIN IS OVER.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WOODSIDE...TULLYTOWN...RICHBORO...NEWTOWN...LEVITTOWN...LANGHORNE...
IVYLAND...FEASTERVILLE AND DOYLESTOWN
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4006 7495 4003 7498 4004 7499 4008 7497
4011 7497 4013 7499 4014 7504 4024 7520
4026 7520 4040 7503 4016 7477
$$
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 9:01 PM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 9 hr |
| Oct 24, 9:25 PM EDT | River Flood Warning | PHI | Bucks | 5 hr |
| Oct 24, 9:26 PM EDT | Areal Flood Warning | PHI | Delaware | 5 hr |
| Oct 24, 9:58 PM EDT | Areal Flood Warning | PHI | Montgomery | 4 hr |
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.