Alert archive / Pennsylvania / Flash Flood Warnings in 2013
Flash Flood Warning 54, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 13, 2013, 6:36 AM EDT for Chester County, Delaware County, Montgomery County, Pennsylvania. It was in force for 8 hr. 2 reports 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 13, 2013, 6:36 AM EDT (10:36 UTC)
- Expired
- Aug 13, 2013, 2:30 PM EDT
- In force
- 8 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 91 km from the middle of the area, began a volume at 10:37 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 13, 8:08 AM EDT | FLASH FLOOD | Radnor, PA | FLOODING IN STREETS |
| Aug 13, 10:10 AM EDT | FLASH FLOOD | Tredyffrin Twp, PA | ROADS FLOODED IN GLENHARDIE NEIGHBORHOOD. |
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 00:00Z, 10.6 hours before the alert went out and 209 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
- 1 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 1841 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
230
WGUS51 KPHI 131036
FFWPHI
PAC029-045-091-131430-
/O.NEW.KPHI.FF.W.0054.130813T1036Z-130813T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
636 AM EDT TUE AUG 13 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
MONTGOMERY COUNTY...
DELAWARE COUNTY...
EASTERN CHESTER COUNTY...
* UNTIL 1030 AM EDT...
* AT 629 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
ADDITIONAL HEAVY RAIN MOVING INTO DELAWARE COUNTY...EASTERN
CHESTER COUNTY AND MONTGOMERY COUNTY. SOME LOCATIONS HAVE ALREADY
RECEIVED ONE TO THREE INCHES OF RAIN. AN ADDITIONAL ONE TO THREE
INCHES OF RAIN IS EXPECTED.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO AMBLER...
COLLEGEVILLE...CONSHOHOCKEN...HATFIELD...LANSDALE...NORRISTOWN...
POTTSTOWN AND 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 4023 7572 4032 7563 4029 7527 4020 7512
4008 7520 4009 7523 4006 7526 4003 7524
3982 7539 3984 7551 3983 7572 4012 7558
4013 7589
$$
IOVINO2 follow-up statements
844
WGUS71 KPHI 131228
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
828 AM EDT TUE AUG 13 2013
PAC029-045-091-131430-
/O.CON.KPHI.FF.W.0054.000000T0000Z-130813T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONTGOMERY PA-DELAWARE PA-CHESTER PA-
828 AM EDT TUE AUG 13 2013
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM EDT FOR
EASTERN CHESTER...DELAWARE AND MONTGOMERY COUNTIES...
AT 825 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED
THAT TWO TO FOUR INCHES OF RAIN FELL IN MUCH OF THE AREA THIS
MORNING. SOME LOCATIONS FROM AROUND EXTON TO VALLEY FORGE TO BLUE
BELL MAY HAVE RECEIVED UP TO FIVE OR SIX INCHES OF RAIN. AN
ADDITIONAL INCH OR TWO OF RAIN IS POSSIBLE AT SOME LOCATIONS AND IT
MAY CAUSE ADDITIONAL FLASH FLOODING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
&&
LAT...LON 4023 7572 4032 7563 4029 7527 4020 7512
4008 7520 4009 7523 4006 7526 4003 7524
3982 7539 3984 7551 3983 7572 4012 7558
4013 7589
$$
IOVINO225
WGUS51 KPHI 131403
FFWPHI
PAC029-045-091-131830-
/O.EXT.KPHI.FF.W.0054.000000T0000Z-130813T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1003 AM EDT TUE AUG 13 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE
* FLASH FLOOD WARNING FOR...
MONTGOMERY COUNTY...
DELAWARE COUNTY...
EASTERN CHESTER COUNTY...
* UNTIL 230 PM EDT...
* AT 956 AM EDT...FLASH FLOODING WAS REPORTED THROUGHOUT THE AREA
FROM HEAVY RAIN DURING THE OVERNIGHT HOURS. WHILE THE HEAVIEST
RAIN HAS MOVED EAST...LIGHTER RAIN IS EXPECTED FOR THE NEXT FEW
HOURS. THE FLASH FLOOD WARNING FOR MONTGOMERY...DELAWARE AND
EASTERN CHESTER COUNTY HAS THEREFORE BEEN EXTENDED INTO THE
AFTERNOON HOURS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.
&&
LAT...LON 4023 7572 4032 7563 4029 7527 4020 7512
4008 7520 4009 7523 4006 7526 4003 7524
3982 7539 3984 7551 3983 7572 4012 7558
4013 7589
$$
FORECASTER:JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 2:45 AM EDT | Flash Flood Watch | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 9 hr |
| Aug 13, 5:15 AM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 4 hr |
| Aug 13, 5:47 AM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Aug 13, 6:07 AM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Northampton | 7 hr |
| Aug 13, 6:07 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 53 min |
| Aug 13, 6:20 AM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 4 hr |
| Aug 13, 6:23 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 67 min |
| Aug 13, 6:32 AM EDT | Tornado Warning | PHI | Chester | 43 min |
| Aug 13, 7:05 AM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 40 min |
| Aug 13, 7:14 AM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Aug 13, 7:42 AM EDT | Special Weather Statement | PHI | Philadelphia | 48 min |
| Aug 13, 7:54 AM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 8 hr |
| Aug 13, 7:54 AM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 66 min |
| Aug 13, 8:07 AM EDT | River Flood Warning | PHI | Chester | 9 hr |
| Aug 13, 8:20 AM EDT | Flash Flood Warning | PHI | Bucks | 8 hr |
| Aug 13, 9:50 AM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Aug 13, 11:22 AM EDT | River Flood Warning | PHI | Chester, Delaware | 16 hr |
| Aug 13, 2:18 PM EDT | Areal Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 9 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.