Alert archive / Pennsylvania / Flash Flood Warnings in 2009
Flash Flood Warning 3, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at May 7, 2009, 1:51 AM EDT for Delaware County, Philadelphia County, Pennsylvania; New Castle County, Delaware. It was in force for 5 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
- May 7, 2009, 1:51 AM EDT (05:51 UTC)
- Expired
- May 7, 2009, 6:45 AM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties New Castle County, DE, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 83 km from the middle of the area, began a volume at 05:55 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 00:00Z, 5.9 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 465 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 257 m²/s²
- 0-3 km storm-relative helicity
- 364 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 070551
FFWPHI
DEC003-PAC045-101-071045-
/O.NEW.KPHI.FF.W.0003.090507T0551Z-090507T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
151 AM EDT THU MAY 7 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NEW CASTLE COUNTY IN NORTHERN DELAWARE...
THIS INCLUDES THE CITIES OF...WILMINGTON...NEWARK...MIDDLETOWN...
DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF PHILADELPHIA...
* UNTIL 645 AM EDT
* AT 149 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM HEAVY RAIN AND SCATTERED THUNDERSTORMS OVER
THE WARNED AREA WITH MORE HEAVY RAIN EXPECTED AS WELL AS MORE
THUNDERSTORMS MOVING IN FROM THE SOUTHWEST. RAINFALL RATES OF
OVER AN INCH IN LESS THAN AN HOUR IS POSSIBLE.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WISSINOMING...TROUT LAKE...TEMPLE UNIVERSITY...TACONY...SOUTH
PHILADELPHIA...ROXBOROUGH...PHILADELPHIA INTERNATIONAL AIRPORT...
NORTHEAST PHILADELPHIA...NEWTOWN SQUARE...MORRIS PARK...
KENSINGTON...HOLMESBURG...GRADYVILLE...ELAM...CONCORDVILLE...
CHEYNEY...CHESTNUT HILL...CHELSEA...CENTER CITY...MOUNT PLEASANT...
SAINT GEORGES...NORTH STAR...HOCKESSIN...GLASGOW...BEAR...
ASHLAND...GERMANTOWN...YEADON...SWARTHMORE...RADNOR TOWNSHIP...
NETHER PROVIDENCE TOWNSHIP...LIMA...FOLCROFT...EAST LANSDOWNE...
DREXEL HILL...CHESTER...BROOMALL...WILMINGTON MANOR...
TALLEYVILLE...STANTON...PIKE CREEK...NEWPORT...NEW CASTLE...ELSMERE
AND DELAWARE CITY
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
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 3979 7573 3984 7560 3987 7562 4006 7538
3998 7528 4001 7522 4005 7527 4009 7523
4005 7512 4012 7505 4011 7496 4004 7498
3995 7514 3988 7518 3984 7537 3962 7560
3957 7555 3938 7577 3971 7579
$$
RNS/IOVINOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 9:01 PM EDT | Flood Watch | PHI | Delaware, Philadelphia | 19 hr |
| May 7, 1:08 AM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 6 hr |
| May 7, 1:43 AM EDT | Flash Flood Warning | PHI | Bucks | 5 hr |
| May 7, 10:15 AM EDT | Areal Flood Warning | PHI | Montgomery | 3 hr |
| May 7, 1:42 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery | 4 hr |
| May 7, 2:34 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| May 7, 2:00 AM EDT | River Flood Warning | PHI | New Castle | 3 hr |
| May 7, 1:22 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| May 7, 1:33 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 66 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2009Flash Flood Warnings in Delaware, 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.