Alert archive / Delaware / Flash Flood Warnings in 2009
Flash Flood Warning 36, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 12, 2009, 4:39 PM EDT for Kent County, New Castle County, Delaware. It was in force for 3 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
- Aug 12, 2009, 4:39 PM EDT (20:39 UTC)
- Expired
- Aug 12, 2009, 7:25 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Kent County, DE, New Castle County, DE
The radar
The Dover AFB radar (KDOX), 50 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 48 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 122039
FFWPHI
DEC001-003-130045-
/O.NEW.KPHI.FF.W.0036.090812T2039Z-090813T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
439 PM EDT WED AUG 12 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTH CENTRAL KENT COUNTY IN CENTRAL DELAWARE...
SOUTH CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
* UNTIL 845 PM EDT
* AT 436 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 WITH RAINFALL RATES APPROACHING SIX INCHES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GREEN
SPRING...SMYRNA AND CLAYTON
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 3910 7562 3928 7571 3934 7572 3940 7559
3928 7543
$$
KRUZDLO1 follow-up statement
000
WGUS71 KPHI 122325
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
725 PM EDT WED AUG 12 2009
DEC001-003-122335-
/O.CAN.KPHI.FF.W.0036.000000T0000Z-090813T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT DE-NEW CASTLE DE-
725 PM EDT WED AUG 12 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL NEW
CASTLE AND NORTH CENTRAL KENT COUNTIES...
THE HEAVY RAIN HAS MOVED OUT OF THE AREA. THE FLASH FLOOD WARNING
HAS BEEN CANCELLED.
LAT...LON 3910 7562 3928 7571 3934 7572 3940 7559
3928 7543
$$
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, 4:55 PM EDT | Flash Flood Warning | PHI | New Castle | 3 hr |
| Aug 12, 5:55 PM EDT | Flash Flood Warning | PHI | New Castle | 100 min |
Nearby
Flash 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.