Alert archive / Pennsylvania / Flash Flood Warnings in 2013
Flash Flood Warning 11, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 18, 2013, 12:51 PM EDT for Chester County, Montgomery County, Pennsylvania. 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
- Jun 18, 2013, 12:51 PM EDT (16:51 UTC)
- Expired
- Jun 18, 2013, 3:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 16:53 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, 4.9 hours before the alert went out and 77 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
- 811 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 833 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
463
WGUS51 KPHI 181651
FFWPHI
PAC029-091-181945-
/O.NEW.KPHI.FF.W.0011.130618T1651Z-130618T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1251 PM EDT TUE JUN 18 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
MONTGOMERY COUNTY...
CHESTER COUNTY...
* UNTIL 345 PM EDT...
* AT 1249 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM THUNDERSTORMS OVER CENTRAL AND NORTHERN
CHESTER COUNTY...AND WESTERN MONTGOMERY COUNTY. RAINFALL RATES OF
TWO TO THREE INCHES PER HOUR ARE POSSIBLE IN SOME LOCATIONS.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEST
CHESTER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!
&&
LAT...LON 4003 7594 4013 7591 4023 7572 4038 7558
4017 7517 4003 7533 4006 7536 4004 7541
4002 7541 3999 7545 3998 7544 3995 7552
3989 7559 3985 7560 3984 7558 3996 7600
$$
FORECASTER:JJM1 follow-up statement
951
WGUS71 KPHI 181855
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
255 PM EDT TUE JUN 18 2013
PAC029-091-181905-
/O.CAN.KPHI.FF.W.0011.000000T0000Z-130618T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONTGOMERY PA-CHESTER PA-
255 PM EDT TUE JUN 18 2013
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CHESTER AND
MONTGOMERY COUNTIES...
THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.
LAT...LON 4003 7594 4013 7591 4023 7572 4038 7558
4017 7517 4003 7533 4006 7536 4004 7541
4002 7541 3999 7545 3998 7544 3995 7552
3989 7559 3985 7560 3984 7558 3996 7600
$$
FORECASTER:POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 10:30 AM EDT | Special Weather Statement | PHI | Montgomery, Philadelphia | 60 min |
| Jun 18, 12:14 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jun 18, 1:32 PM EDT | Areal Flood Advisory | PHI | Philadelphia | 3 hr |
| Jun 18, 2:53 PM EDT | Areal Flood Warning | PHI | Chester | 3 hr |
| Jun 18, 4:52 PM EDT | Special Weather Statement | PHI | Northampton | 53 min |
| Jun 18, 5:18 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh, Northampton | 4 hr |
| Jun 18, 5:56 PM EDT | Areal Flood Advisory | PHI | Bucks | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2013Every flash flood warning in 2013
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.