Alert archive / Maryland / Flash Flood Warnings in 2009
Flash Flood Warning 59, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 28, 2009, 2:13 PM EDT for Cecil County, Maryland. It was in force for 2 hr. 1 report 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
- Aug 28, 2009, 2:13 PM EDT (18:13 UTC)
- Expired
- Aug 28, 2009, 4:30 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Cecil County, MD
The radar
The Dover AFB radar (KDOX), 86 km from the middle of the area, began a volume at 18:15 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 |
|---|---|---|---|
| Aug 28, 2:55 PM EDT | FLASH FLOOD | Cayots, MD | OLD TELEGRAPH ROAD CLOSED JUST EAST OF CAYOTS. |
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, 6.2 hours before the alert went out and 138 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
- 787 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 281813
FFWPHI
MDC015-282030-
/O.NEW.KPHI.FF.W.0059.090828T1813Z-090828T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
213 PM EDT FRI AUG 28 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHERN CECIL COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF ELKTON...
* UNTIL 430 PM EDT
* AT 202 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY RAIN ACROSS THE SOUTHERN PORTION OF CECIL COUNTY. AN
ADDITIONAL ONE TO TWO INCHES OF RAIN IS LIKELY OVER THE NEXT
COUPLE HOURS ACROSS PORTIONS OF THE WARNED AREA. THIS IS IN
ADDITION TO THE TWO TO ALMOST FOUR INCHES THAT FELL IN SPOTS
EARLIER THIS MORNING.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOLLYWOOD
BEACH...CAYOTS...BRANTWOOD...NORTH EAST AND CHARLESTOWN
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 3967 7579 3939 7577 3938 7585 3937 7584
3938 7604 3941 7605 3942 7602 3945 7600
3946 7602 3953 7599 3955 7603 3954 7607
3957 7610
$$
KRUZDLOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 1:40 AM EDT | Flash Flood Warning | PHI | Cecil | 5 hr |
| Aug 28, 2:52 PM EDT | Flash Flood Watch | PHI | Cecil | 14 hr |
| Aug 28, 2:53 PM EDT | Flash Flood Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 6 hr |
| Aug 28, 3:21 PM EDT | Flash Flood Warning | PHI | Caroline, Talbot | 6 hr |
| Aug 28, 6:49 PM EDT | Areal Flood Advisory | PHI | Caroline, Talbot | 5 hr |
Nearby
Flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.