Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 102, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 15, 2015, 3:39 AM EDT for 4 counties in Pennsylvania; New Castle County, Delaware. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 15, 2015, 3:39 AM EDT (07:39 UTC)
- Expired
- Jul 15, 2015, 4:45 AM EDT
- In force
- 66 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 92 km from the middle of the area, began a volume at 07:39 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 7.7 hours before the alert went out and 195 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
- 858 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
531
WUUS51 KPHI 150739
SVRPHI
DEC003-PAC029-045-091-101-150845-
/O.NEW.KPHI.SV.W.0102.150715T0739Z-150715T0845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
339 AM EDT WED JUL 15 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHWESTERN PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 445 AM EDT
* AT 338 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
WAS LOCATED NEAR ELAM...OR NEAR WEST CHESTER...AND MOVING NORTHEAST
AT 25 MPH.
* LOCATIONS IMPACTED INCLUDE...
PHILADELPHIA...WEST CHESTER...NORRISTOWN...CHESTER...WEST
NORRITON...EAST NORRITON...YEADON...WESTTOWN...CONSHOHOCKEN...
FOLCROFT...SWARTHMORE...KENNETT SQUARE...NARBERTH...EAST
LANSDOWNE...MORRIS PARK...SOUTH PHILADELPHIA...MARSHALLTON...
ROXBOROUGH...ELAM AND RADNOR TOWNSHIP.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
IN ADDITION TO DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING
IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 3980 7569 3991 7575 4015 7533 3993 7514
3984 7536
TIME...MOT...LOC 0738Z 243DEG 23KT 3986 7562
$$
HEAVENER2 follow-up statements
412
WWUS51 KPHI 150804
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
404 AM EDT WED JUL 15 2015
DEC003-150813-
/O.CAN.KPHI.SV.W.0102.000000T0000Z-150715T0845Z/
NEW CASTLE DE-
404 AM EDT WED JUL 15 2015
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL NEW CASTLE
COUNTY IS CANCELLED...
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3983 7547 3999 7561 4015 7533 3993 7514
3984 7536
TIME...MOT...LOC 0803Z 243DEG 23KT 3994 7543
$$
PAC029-045-091-101-150845-
/O.CON.KPHI.SV.W.0102.000000T0000Z-150715T0845Z/
DELAWARE PA-CHESTER PA-PHILADELPHIA PA-MONTGOMERY PA-
404 AM EDT WED JUL 15 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 AM EDT
FOR DELAWARE...EAST CENTRAL CHESTER...SOUTHWESTERN PHILADELPHIA AND
SOUTH CENTRAL MONTGOMERY COUNTIES...
AT 403 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED OVER LIMA...OR 9 MILES EAST OF WEST CHESTER...MOVING
NORTHEAST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE...
PHILADELPHIA...NORRISTOWN...CHESTER...WEST NORRITON...EAST
NORRITON...YEADON...WESTTOWN...CONSHOHOCKEN...FOLCROFT...
SWARTHMORE...NARBERTH...EAST LANSDOWNE...MORRIS PARK...SOUTH
PHILADELPHIA...ROXBOROUGH...RADNOR TOWNSHIP...TROUT LAKE...
BROOMALL...PAOLI AND NETHER PROVIDENCE TOWNSHIP.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 3983 7547 3999 7561 4015 7533 3993 7514
3984 7536
TIME...MOT...LOC 0803Z 243DEG 23KT 3994 7543
$$
HEAVENER151
WWUS51 KPHI 150840
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
440 AM EDT WED JUL 15 2015
PAC029-045-091-101-150849-
/O.EXP.KPHI.SV.W.0102.000000T0000Z-150715T0845Z/
DELAWARE PA-CHESTER PA-PHILADELPHIA PA-MONTGOMERY PA-
440 AM EDT WED JUL 15 2015
...THE SEVERE THUNDERSTORM WARNING FOR DELAWARE...EAST CENTRAL
CHESTER...SOUTHWESTERN PHILADELPHIA AND SOUTH CENTRAL MONTGOMERY
COUNTIES WILL EXPIRE AT 445 AM EDT...
LAT...LON 3983 7547 3999 7561 4015 7533 3993 7514
3984 7536
TIME...MOT...LOC 0836Z 243DEG 23KT 3994 7543
$$
HEAVENERThe 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, 3:50 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, 4:27 AM EDT | Flash Flood Warning | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 4 hr |
| 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 |
| Jul 15, 6:04 AM EDT | Special Weather Statement | PHI | New Castle | 56 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2015Severe Thunderstorm Warnings in Delaware, 2015Every severe thunderstorm 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.