Alert archive / Delaware / Flash Flood Warnings in 2009
Flash Flood Warning 39, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 12, 2009, 5:55 PM EDT for New Castle County, Delaware; Cecil County, Maryland. It was in force for 100 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
- Aug 12, 2009, 5:55 PM EDT (21:55 UTC)
- Expired
- Aug 12, 2009, 7:35 PM EDT
- In force
- 100 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties New Castle County, DE, Cecil County, MD
The radar
The Dover AFB radar (KDOX), 83 km from the middle of the area, began a volume at 21:55 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.9 hours before the alert went out and 23 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
- 402 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 122155
FFWPHI
DEC003-MDC015-130200-
/O.NEW.KPHI.FF.W.0039.090812T2155Z-090813T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
555 PM EDT WED AUG 12 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CECIL COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF ELKTON...
SOUTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
THIS INCLUDES THE CITY OF MIDDLETOWN...
* UNTIL 1000 PM EDT
* AT 553 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH TORRENTIAL RAIN ACROSS PORTIONS OF
THE WARNED AREA. RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE
POSSIBLE.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOLLYWOOD
BEACH...ZION...WEST NOTTINGHAM...ROCK SPRINGS...RICHARDSMERE...
PLEASANT HILL...LOMBARD...FARMINGTON...FAIR HILL...CHERRY HILL...
CALVERT...BRANTWOOD...BLAKE...BAY VIEW...BARKSDALE...ANDORA...SAINT
GEORGES...PORT PENN...MOUNT PLEASANT...GLASGOW...BEAR...WOODLAWN...
RISING SUN...NORTH EAST...CHARLESTOWN AND DELAWARE CITY
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 3972 7617 3972 7587 3961 7561 3952 7556
3946 7558 3941 7553 3933 7575 3934 7577
3938 7577 3938 7585 3948 7601 3953 7599
3954 7606
$$
KRUZDLO1 follow-up statement
000
WGUS71 KPHI 122335
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
735 PM EDT WED AUG 12 2009
DEC003-MDC015-122345-
/O.CAN.KPHI.FF.W.0039.000000T0000Z-090813T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-NEW CASTLE DE-
735 PM EDT WED AUG 12 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHERN NEW CASTLE
AND CECIL COUNTIES...
THE HEAVY RAIN HAS MOVED OUT OF THE AREA. THE FLASH FLOOD WARNING
HAS BEEN CANCELLED.
LAT...LON 3972 7617 3972 7587 3961 7561 3952 7556
3946 7558 3941 7553 3933 7575 3934 7577
3938 7577 3938 7585 3948 7601 3953 7599
3954 7606
$$
KRUZDLOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 4:16 PM EDT | Areal Flood Advisory | PHI | Kent | 3 hr |
| Aug 12, 4:39 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| Aug 12, 4:55 PM EDT | Flash Flood Warning | PHI | New Castle | 3 hr |
| Aug 11, 8:09 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 66 min |
| Aug 11, 9:04 PM EDT | Severe Thunderstorm Warning | PHI | Talbot | 26 min |
Nearby
Flash Flood Warnings in Delaware, 2009Flash Flood Warnings in Maryland, 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.