Alert archive / Pennsylvania / Flash Flood Warnings in 2015
Flash Flood Warning 46, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 19, 2015, 4:35 PM EDT for Bucks County, Montgomery County, Philadelphia 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
- Aug 19, 2015, 4:35 PM EDT (20:35 UTC)
- Expired
- Aug 19, 2015, 7:30 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bucks 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 20:36 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
Brookhaven, NY (KOKX), launched 12:00Z, 8.6 hours before the alert went out and 205 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
- 605 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 642 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
811
WGUS51 KPHI 192035
FFWPHI
PAC017-091-101-192330-
/O.NEW.KPHI.FF.W.0046.150819T2035Z-150819T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
435 PM EDT WED AUG 19 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
NORTHWESTERN PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 730 PM EDT
* AT 433 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. BETWEEN ONE AND TWO INCHES OF
RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN
SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... NORTHEAST
PHILADELPHIA...DOYLESTOWN...HATBORO...AMBLER...JENKINTOWN...
CHALFONT...ABINGTON...BRYN ATHYN...IVYLAND...GERMANTOWN...
GARDENVILLE...WILLOW GROVE...CHESTNUT HILL...RICHBORO...HORSHAM...
NEW BRITAIN...ORELAND...BRITTANY FARMS-HIGHLANDS...WYNDMOOR AND
GLENSIDE.
ADDITIONAL RAINFALL AMOUNTS OF UP TO TWO INCHES ARE POSSIBLE IN THE
WARNED AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.
&&
LAT...LON 4001 7515 4006 7524 4029 7523 4039 7518
4042 7509 4034 7503 4025 7499
$$
JRK2 follow-up statements
105
WGUS71 KPHI 192135
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
535 PM EDT WED AUG 19 2015
PAC017-091-101-192330-
/O.CON.KPHI.FF.W.0046.000000T0000Z-150819T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-
535 PM EDT WED AUG 19 2015
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM EDT FOR
CENTRAL BUCKS...SOUTHEASTERN MONTGOMERY AND NORTH CENTRAL
PHILADELPHIA COUNTIES...
AT 529 PM EDT...DOPPLER RADAR INDICATED UP TO TWO INCHES OF RAIN HAS
FALLEN ACROSS THE WARNED AREA. THE HEAVY RAIN HAS ENDED BUT
EXCESSIVE RUNOFF FROM EARLIER RAINFALL COULD STILL LEAD TO FLASH
FLOODING...ESPECIALLY IN URBAN AND POOR DRAINAGE AREAS.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...DOYLESTOWN...HATBORO...JENKINTOWN...ABINGTON...BRYN
ATHYN...IVYLAND...WILLOW GROVE...GARDENVILLE...HORSHAM...NEW
BRITAIN...WYNDMOOR...ORELAND...GLENSIDE...WYNCOTE...MAPLE
GLEN...FORT WASHINGTON...WARMINSTER HEIGHTS AND FLOURTOWN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.
&&
LAT...LON 4004 7513 4004 7518 4005 7520 4016 7521
4024 7516 4037 7519 4038 7518 4042 7509
4031 7502 4018 7505 4014 7507
$$
JRK503
WGUS71 KPHI 192218
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
618 PM EDT WED AUG 19 2015
PAC017-091-101-192227-
/O.CAN.KPHI.FF.W.0046.000000T0000Z-150819T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-
618 PM EDT WED AUG 19 2015
...THE FLASH FLOOD WARNING FOR CENTRAL BUCKS...SOUTHEASTERN
MONTGOMERY AND NORTH CENTRAL PHILADELPHIA COUNTIES IS CANCELLED...
A BRIEF DOWNPOUR IS STILL POSSIBLE WITH A SHOWER OVER THE AREA BUT
THE HEAVY RAINFALL HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO
POSE A THREAT.
LAT...LON 4004 7513 4004 7518 4005 7520 4016 7521
4024 7516 4037 7519 4038 7518 4042 7509
4031 7502 4018 7505 4014 7507
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 12:46 PM EDT | Areal Flood Advisory | PHI | Chester | 119 min |
| Aug 19, 4:19 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 116 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.