Alert archive / Pennsylvania / Flash Flood Warnings in 2015
Flash Flood Warning 35, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 15, 2015, 4:27 AM EDT for 7 counties in Pennsylvania. It was in force for 4 hr. 4 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
- Jul 15, 2015, 4:27 AM EDT (08:27 UTC)
- Expired
- Jul 15, 2015, 8:30 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 08:27 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 |
|---|---|---|---|
| Jul 15, 4:30 AM EDT | FLASH FLOOD | Pottstown, PA | CARS STALLED IN HIGH WATER IN POTTSTOWN. ALSO... COLLEGE DRIVE WAS CLOSED DUE TO HIGH WATER. |
| Jul 15, 4:40 AM EDT | FLOOD | 1 Ne Broomall, PA | FLOODING REPORTED ON I476 NEAR BROOMALL |
| Jul 15, 6:28 AM EDT | FLOOD | Amity Gardens, PA | ROADS CLOSED IN AMITY GARDENS DUE TO FLOODING. |
| Jul 15, 7:59 AM EDT | HEAVY RAIN 2.13 | 1 W Limerick, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 8.5 hours before the alert went out and 215 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
- 623 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
083
WGUS51 KPHI 150827
FFWPHI
PAC011-017-029-045-077-091-101-151230-
/O.NEW.KPHI.FF.W.0035.150715T0827Z-150715T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
427 AM EDT WED JUL 15 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
NORTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHWESTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 830 AM EDT
* AT 426 AM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. UP TO ONE TO ONE AND HALF
INCHES OF RAIN HAS ALREADY FALLEN WITHIN THE PAST 20 TO 30
MINUTES. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...READING...CAMDEN...BENSALEM...NORRISTOWN...
POTTSTOWN...PHOENIXVILLE...LANSDALE...WEST NORRITON...EAST
NORRITON...YEADON...EMMAUS...QUAKERTOWN...PERKASIE...
CONSHOHOCKEN...HATBORO...SOUDERTON...FOLCROFT...AMBLER AND
PAULSBORO.
ADDITIONAL RAINFALL AMOUNTS OF ONE INCH ARE POSSIBLE IN THE WARNED
AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4056 7553 4009 7488 4007 7491 4005 7497
4002 7501 4002 7504 3998 7508 3996 7513
3995 7514 3992 7513 3986 7522 3985 7526
4034 7591
$$
HEAVENER3 follow-up statements
041
WGUS71 KPHI 151031
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
631 AM EDT WED JUL 15 2015
PAC011-017-029-045-077-091-101-151230-
/O.CON.KPHI.FF.W.0035.000000T0000Z-150715T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE PA-CHESTER PA-BUCKS PA-BERKS PA-LEHIGH PA-PHILADELPHIA PA-
MONTGOMERY PA-
631 AM EDT WED JUL 15 2015
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 AM EDT FOR
NORTHEASTERN DELAWARE...NORTHEASTERN CHESTER...SOUTHWESTERN BUCKS...
SOUTHEASTERN BERKS...SOUTHEASTERN LEHIGH...PHILADELPHIA AND
MONTGOMERY COUNTIES...
AT 625 AM EDT...DOPPLER RADAR INDICATED MODERATE TO HEAVY RAIN
SHOWERS ACROSS THE WARNED AREA. THOUGH THE INTENSITY OF THE CURRENT
STORMS HAS DECREASED THERE ARE MORE SHOWERS AND THUNDERSTORMS JUST
UPWIND OF THE CURRENT ACTIVITY. THESE SHOWERS MAY EXACERBATE ANY
CURRENT FLASH FLOOD THREATS.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...READING...CAMDEN...BENSALEM...NORRISTOWN...
POTTSTOWN...PHOENIXVILLE...LANSDALE...WEST NORRITON...EAST
NORRITON...YEADON...EMMAUS...QUAKERTOWN...PERKASIE...CONSHOHOCKEN...
HATBORO...SOUDERTON...FOLCROFT...AMBLER AND PAULSBORO.
ADDITIONAL RAINFALL AMOUNTS OF ONE-HALF OF AN INCH ARE POSSIBLE IN
THE WARNED AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
&&
LAT...LON 4056 7553 4009 7488 4007 7491 4005 7497
4002 7501 4002 7504 3998 7508 3996 7513
3995 7514 3992 7513 3986 7522 3985 7526
4034 7591
$$
HEAVENER113
WGUS71 KPHI 151140
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
740 AM EDT WED JUL 15 2015
PAC011-077-151146-
/O.CAN.KPHI.FF.W.0035.000000T0000Z-150715T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-LEHIGH PA-
740 AM EDT WED JUL 15 2015
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN BERKS AND SOUTHEASTERN
LEHIGH COUNTIES IS CANCELLED...
THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO
POSE A THREAT. PERIODS OF LIGHT TO MODERATE RAIN WILL CONTINUE
THROUGH THE MORNING. PLEASE CONTINUE TO HEED ALL ROAD CLOSURES.
LAT...LON 4009 7488 4007 7491 4005 7497 4002 7501
4002 7504 3998 7508 3996 7513 3995 7514
3992 7513 3986 7522 3985 7526 4012 7562
4034 7523
$$
PAC017-029-045-091-101-151230-
/O.CON.KPHI.FF.W.0035.000000T0000Z-150715T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE PA-CHESTER PA-BUCKS PA-PHILADELPHIA PA-MONTGOMERY PA-
740 AM EDT WED JUL 15 2015
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 AM EDT FOR
NORTHEASTERN DELAWARE...NORTHEASTERN CHESTER...SOUTH CENTRAL BUCKS...
PHILADELPHIA AND MONTGOMERY COUNTIES...
AT 736 AM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE URBANIZED AREA OF SOUTHEAST PENNSYLVANIA WITH
RAIN RATES OF AN INCH OR MORE PER HOUR. THE FLASH FLOOD THREAT
CONTINUES THIS MORNING.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...CAMDEN...BENSALEM...NORRISTOWN...PHOENIXVILLE...
LANSDALE...WEST NORRITON...EAST NORRITON...YEADON...CONSHOHOCKEN...
HATBORO...FOLCROFT...AMBLER...PAULSBORO...COLLEGEVILLE...
JENKINTOWN...NARBERTH...CHALFONT...TRAPPE AND HATFIELD.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE
INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE
USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING
FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DON'T DROWN.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE PONDING OF WATER IN
URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER
POOR DRAINAGE AREAS AND LOW LYING SPOTS. DO NOT ATTEMPT TO TRAVEL
ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES.
&&
LAT...LON 4009 7488 4007 7491 4005 7497 4002 7501
4002 7504 3998 7508 3996 7513 3995 7514
3992 7513 3986 7522 3985 7526 4012 7562
4034 7523
$$
ROBERTSON556
WGUS71 KPHI 151228
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
828 AM EDT WED JUL 15 2015
PAC017-029-045-091-101-151234-
/O.EXP.KPHI.FF.W.0035.000000T0000Z-150715T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE PA-CHESTER PA-BUCKS PA-PHILADELPHIA PA-MONTGOMERY PA-
828 AM EDT WED JUL 15 2015
...THE FLASH FLOOD WARNING FOR NORTHEASTERN DELAWARE...NORTHEASTERN
CHESTER...SOUTH CENTRAL BUCKS...PHILADELPHIA AND MONTGOMERY COUNTIES
WILL EXPIRE AT 830 AM EDT...
COUNTY EMERGENCY OFFICIALS INDICATED THE FLOODING THAT OCCURRED
EARLIER THIS MORNING HAS RECEDED. THEREFORE, THE WARNING WILL BE
ALLOWED TO EXPIRE.
MORE RAIN IS EXPECTED THIS MORNING. ADDITIONAL FLOODING IS POSSIBLE.
LAT...LON 4009 7488 4007 7491 4005 7497 4002 7501
4002 7504 3998 7508 3996 7513 3995 7514
3992 7513 3986 7522 3985 7526 4012 7562
4034 7523
$$
KRUZDLOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 2:36 AM EDT | Special Weather Statement | PHI | Berks, Chester | 24 min |
| Jul 15, 3:11 AM EDT | Special Weather Statement | PHI | Berks, Chester | 64 min |
| Jul 15, 3:39 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 66 min |
| Jul 15, 3:50 AM EDT | Areal Flood Advisory | PHI | Berks, Chester, Delaware, Montgomery | 4 hr |
| Jul 15, 4:11 AM EDT | Special Weather Statement | PHI | Bucks, Lehigh, Montgomery | 64 min |
| Jul 15, 4:48 AM EDT | Special Weather Statement | PHI | Bucks | 27 min |
| Jul 15, 5:36 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Philadelphia | 4 hr |
| Jul 15, 6:51 AM EDT | Areal Flood Advisory | PHI | Monroe, Northampton | 4 hr |
| Jul 15, 7:22 AM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 4 hr |
| Jul 15, 9:12 AM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2015Every flash flood warning in 2015
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.