Alert archive / Pennsylvania / Flash Flood Warnings in 2015
Flash Flood Warning 16, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 26, 2015, 11:13 PM EDT for Montgomery County, Philadelphia County, Pennsylvania. It was in force for 4 hr. 3 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
- Jun 26, 2015, 11:13 PM EDT (03:13 UTC)
- Expired
- Jun 27, 2015, 3:15 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 03:17 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 |
|---|---|---|---|
| Jun 26, 11:20 PM EDT | FLASH FLOOD | Gulph Mills, PA | INTERSTATE 76 IN THE GULPH MILLS AREA FLOODED WITH TRAFFIC SLOWED OR STOPPED. |
| Jun 26, 11:35 PM EDT | FLASH FLOOD | King Of Prussia, PA | NUMEROUS ROADS FLOODED. |
| Jun 27, 12:15 AM EDT | FLASH FLOOD | West Conshohocken, PA | BALLIGOMOINGO ROAD CLOSED FROM FRONT STREET TO PORTLAND ROAD DUE TO FLOODING AND A MUD SLIDE. |
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, 3.2 hours before the alert went out and 218 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
- 7 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1208 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
813
WGUS51 KPHI 270313
FFWPHI
PAC091-101-270715-
/O.NEW.KPHI.FF.W.0016.150627T0313Z-150627T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1113 PM EDT FRI JUN 26 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHWESTERN PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 315 AM EDT
* AT 1112 PM EDT...DOPPLER RADAR INDICATED VERY HEAVY RAIN ACROSS
THE WARNED AREA ASSOCIATED WITH SLOW MOVING HEAVY SHOWERS. RADAR
ESTIMATES INDICATED RAINFALL OF 3 INCHES HAS FALLEN ALREADY IN
PORTIONS OF THE WARNED AREA AND ADDITIONAL RAIN IS EXPECTED. THIS
AMOUNT OF RAIN IN A SHORT PERIOD OF TIME WILL LEAD TO FLASH
FLOODING.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...NORRISTOWN...WEST NORRITON...EAST NORRITON...
CONSHOHOCKEN...NARBERTH...PLYMOUTH MEETING...CHESTNUT HILL...BRYN
MAWR...KING OF PRUSSIA...GERMANTOWN...BRIDGEPORT...WEST
CONSHOHOCKEN...WYNDMOOR...PENN WYNNE...ARDMORE...FLOURTOWN AND
AUDUBON.
THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...GULPH CREEK...
PLYMOUTH CREEK...COBBS CREEK...MILL CREEK...STONY CREEK...ITHAN
CREEK...CRESHEIM CREEK...TROUT CREEK...AND MILL RUN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4014 7532 4007 7515 3998 7527 4004 7534
4006 7535 4007 7538 4012 7544
$$
GORSE2 follow-up statements
063
WGUS71 KPHI 270421
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1221 AM EDT SAT JUN 27 2015
PAC091-101-270715-
/O.CON.KPHI.FF.W.0016.000000T0000Z-150627T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-MONTGOMERY PA-
1221 AM EDT SAT JUN 27 2015
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT FOR
NORTHWESTERN PHILADELPHIA AND SOUTH CENTRAL MONTGOMERY COUNTIES...
AT 1217 AM EDT...DOPPLER RADAR INDICATED THE NEARLY STATIONARY
SHOWERS PRODUCING TORRENTIAL RAIN IS WEAKENING SOME. THE RADAR
ESTIMATES ARE BETWEEN 2 AND 5 INCHES OF RAIN ESPECIALLY BETWEEN
ABOUT CONSHOHOCKEN TO NARBERTH IN MONTGOMERY COUNTY, WITH LESSER
AMOUNTS INTO PHILADELPHIA COUNTY. MONTGOMERY COUNTY OFFICIALS ARE
REPORTING ROAD CLOSURES IN THE CONSHOHOCKEN AREA.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...NORRISTOWN...WEST NORRITON...EAST NORRITON...
CONSHOHOCKEN...NARBERTH...PLYMOUTH MEETING...CHESTNUT HILL...BRYN
MAWR...KING OF PRUSSIA...GERMANTOWN...BRIDGEPORT...WEST
CONSHOHOCKEN...WYNDMOOR...PENN WYNNE...ARDMORE...FLOURTOWN AND
AUDUBON.
THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...GULPH CREEK...
PLYMOUTH CREEK...COBBS CREEK...MILL CREEK...STONY CREEK...ITHAN
CREEK...CRESHEIM CREEK...TROUT CREEK...MILL RUN AND SCHUYLKILL RIVER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.
&&
LAT...LON 4014 7532 4007 7515 3998 7527 4004 7534
4006 7535 4007 7538 4012 7544
$$
GORSE181
WGUS71 KPHI 270708
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
308 AM EDT SAT JUN 27 2015
PAC091-101-270717-
/O.EXP.KPHI.FF.W.0016.000000T0000Z-150627T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-MONTGOMERY PA-
308 AM EDT SAT JUN 27 2015
...THE FLASH FLOOD WARNING FOR NORTHWESTERN PHILADELPHIA AND SOUTH
CENTRAL MONTGOMERY COUNTIES WILL EXPIRE AT 315 AM EDT...
FLOOD WATERS ARE RECEDING...AND SHOULD NO LONGER POSE A THREAT TO
LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD CLOSURES.
LAT...LON 4014 7532 4007 7515 3998 7527 4004 7534
4006 7535 4007 7538 4012 7544
$$
GORSEThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 9:42 PM EDT | Areal Flood Advisory | PHI | Montgomery | 4 hr |
| Jun 26, 10:38 PM EDT | Areal Flood Advisory | PHI | Montgomery, Philadelphia | 3 hr |
| Jun 26, 10:59 PM EDT | Flash Flood Warning | PHI | Montgomery | 4 hr |
| Jun 26, 11:45 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 4 hr |
| Jun 27, 5:30 PM EDT | Coastal Flood Advisory | PHI | Delaware, Philadelphia | 7 hr |
| Jun 27, 5:35 PM EDT | Areal Flood Advisory | PHI | 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.