Alert archive / Pennsylvania / Flash Flood Warnings in 2011
Flash Flood Warning 22, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 14, 2011, 1:12 AM EDT for Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 4 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 14, 2011, 1:12 AM EDT (05:12 UTC)
- Expired
- Aug 14, 2011, 5:15 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cecil County, MD, Chester County, PA
The radar
The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 05:15 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 5.2 hours before the alert went out and 175 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 7399 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
521
WGUS51 KPHI 140512
FFWPHI
MDC015-PAC029-140915-
/O.NEW.KPHI.FF.W.0022.110814T0512Z-110814T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
112 AM EDT SUN AUG 14 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHERN CECIL COUNTY...
CHESTER COUNTY...
* UNTIL 515 AM EDT...
* AT 106 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED
OVER FOUR INCHES OF RAIN HAS FALLEN OVER PORTIONS OF THE WARNED
AREA SINCE SATURDAY AFTERNOON. IN ADDITION...HEAVY RAIN HAS BEEN
TRAINING OVER PORTIONS OF CECIL AND SOUTHERN CHESTER COUNTY FOR
THE PAST FEW HOURS. WITH EVEN MORE RAIN ON THE WAY...FLASH
FLOODING IS EXPECTED IN PARTS OF CECIL COUNTY AND IN CHESTER
COUNTY DURING THE NEXT FEW HOURS. THIS MEANS THAT ROADWAY FLOODING
AND FLOODING ALONG SMALL WATERWAYS CAN BE EXPECTED.
NO FLOODING IS EXPECTED ALONG THE BRANDYWINE RIVER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.
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.
&&
LAT...LON 3975 7612 3987 7601 3992 7601 4003 7595
4011 7595 4026 7566 4020 7556 4013 7551
4009 7545 4010 7543 4007 7541 3996 7548
3987 7562 3984 7560 3982 7570 3972 7579
3953 7578 3950 7580 3954 7607 3964 7616
$$
FORECASTER:JJM1 follow-up statement
817
WGUS71 KPHI 140645
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
245 AM EDT SUN AUG 14 2011
PAC029-140654-
/O.CAN.KPHI.FF.W.0022.000000T0000Z-110814T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESTER PA-
245 AM EDT SUN AUG 14 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CHESTER COUNTY...
THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED FOR CHESTER COUNTY.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEST CHESTER.
LAT...LON 3965 7615 3971 7613 3972 7579 3953 7578
3950 7580 3953 7600 3955 7603 3954 7607
3964 7616
$$
MDC015-140915-
/O.CON.KPHI.FF.W.0022.000000T0000Z-110814T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-
245 AM EDT SUN AUG 14 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 AM EDT FOR
NORTHERN CECIL COUNTY...
WHILE THE HEAVY RAIN HAS MOVED OUT OF CECIL COUNTY...WATER REMAINS
HIGH IN SOME SPOTS. THEREFORE THE FLASH FLOOD WARNING REMAIN IN
EFFECT FOR THE TIME BEING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE BY CALLING YOUR LOCAL
LAW ENFORCEMENT OFFICIALS OR BY CALLING THE NATIONAL WEATHER SERVICE
TOLL FREE AT...1-877-633-6772.
&&
LAT...LON 3965 7615 3971 7613 3972 7579 3953 7578
3950 7580 3953 7600 3955 7603 3954 7607
3964 7616
$$
FORECASTER: JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 9:39 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Aug 13, 9:56 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh, Northampton | 4 hr |
| Aug 13, 11:33 PM EDT | Areal Flood Advisory | PHI | Bucks | 4 hr |
| Aug 14, 12:37 AM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Aug 14, 3:42 AM EDT | Flash Flood Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 25 hr |
| Aug 14, 3:55 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 14, 4:45 AM EDT | Special Weather Statement | PHI | Philadelphia | 60 min |
| Aug 14, 6:24 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 14, 7:43 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 14, 9:21 AM EDT | Areal Flood Warning | PHI | Northampton | 3 hr |
| Aug 14, 12:37 PM EDT | Areal Flood Warning | PHI | Bucks, Lehigh, Northampton | 7 hr |
| Aug 14, 1:00 PM EDT | Areal Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 8 hr |
| Aug 14, 1:51 AM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 6 hr |
| Aug 14, 2:27 AM EDT | Flash Flood Warning | PHI | Caroline, Kent, Queen Anne's | 4 hr |
| Aug 14, 5:03 AM EDT | Flash Flood Warning | PHI | Cecil, Kent, Queen Anne's | 4 hr |
| Aug 14, 8:41 AM EDT | Flash Flood Warning | PHI | Cecil, Kent, Queen Anne's | 4 hr |
| Aug 14, 12:16 PM EDT | Areal Flood Warning | PHI | Cecil, Kent | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2011Flash Flood Warnings in Maryland, 2011Every flash flood warning in 2011
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.