Alert archive / Pennsylvania / Areal Flood Advisories in 2009
Areal Flood Advisory 21, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jun 13, 2009, 4:59 PM EDT for Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 13, 2009, 4:59 PM EDT (20:59 UTC)
- Expired
- Jun 13, 2009, 9:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 113 km from the middle of the area, began a volume at 21:02 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 12:00Z, 9.0 hours before the alert went out and 161 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
- 18 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 989 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS81 KPHI 132059
FLSPHI
FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
459 PM EDT SAT JUN 13 2009
MDC015-PAC029-140100-
/O.NEW.KPHI.FA.Y.0021.090613T2059Z-090614T0100Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-CHESTER PA-
459 PM EDT SAT JUN 13 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED AN
* URBAN AND SMALL STREAM FLOOD ADVISORY FOR...
CECIL COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF ELKTON...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF WEST CHESTER...
* UNTIL 900 PM EDT
* AT 457 PM EDT DOPPLER RADAR WAS INDICATING WIDELY SCATTERED
THUNDERSTORMS WITH HEAVY RAIN OVER CHESTER AND CECIL COUNTIES.
THUNDERSTORMS HAVE HAD A HISTORY OF PRODUCING HEAVY RAIN AND
WILL CAUSE SOME POOR DRAINAGE AND URBAN FLOODING. IF THE FLOOD
THREAT INCREASES A FLASH FLOOD WARNING MIGHT BECOME NECESSARY.
PLEASE LISTEN FOR FURTHER UPDATES AND STATEMENTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE ELEVATED LEVELS ON
SMALL CREEKS AND STREAMS...AND PONDING OF WATER IN URBAN AREAS...
HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE
AREAS AND LOW LYING SPOTS.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE ELEVATED LEVELS ON
SMALL CREEKS AND STREAMS...AND PONDING OF WATER ON COUNTRY ROADS AND
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.
&&
LAT...LON 3973 7617 3976 7609 3987 7601 4011 7595
4025 7569 4020 7555 4009 7545 4007 7537
3987 7562 3984 7560 3982 7570 3972 7579
3939 7577 3938 7603 3956 7598 3953 7600
3954 7607 3962 7616 3966 7619
$$
GIGIThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 2:27 PM EDT | Areal Flood Advisory | PHI | Chester | 4 hr |
| Jun 13, 2:32 PM EDT | Flash Flood Warning | PHI | Bucks | 2 hr |
| Jun 13, 2:33 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 112 min |
| Jun 13, 2:57 PM EDT | Flash Flood Warning | PHI | Montgomery | 2 hr |
| Jun 13, 3:17 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Jun 13, 4:07 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 6 hr |
| Jun 13, 5:16 PM EDT | River Flood Warning | PHI | Bucks | 13 hr |
| Jun 13, 6:06 PM EDT | Flash Flood Warning | PHI | Chester | 2 hr |
| Jun 13, 6:39 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 66 min |
| Jun 13, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 61 min |
| Jun 13, 3:02 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 58 min |
| Jun 13, 4:50 PM EDT | Areal Flood Advisory | PHI | Caroline | 3 hr |
| Jun 13, 4:52 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 53 min |
Nearby
Areal Flood Advisories in Pennsylvania, 2009Areal Flood Advisories in Maryland, 2009Every areal flood advisory 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.