Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 94, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2015, 7:39 PM EDT for 4 counties in New Jersey; 5 counties in Pennsylvania. It was in force for 66 min. 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
- Jul 9, 2015, 7:39 PM EDT (23:39 UTC)
- Expired
- Jul 9, 2015, 8:45 PM EDT
- In force
- 66 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 23:38 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 9, 8:00 PM EDT | TSTM WND DMG | Aston Arms, PA | TREES DOWN SEVERAL LOCATIONS AROUND THE COUNTY. |
| Jul 9, 8:18 PM EDT | TSTM WND DMG | Philadelphia, PA | LARGE TREE DOWN ON A BUILDING IN WASHINGTON SQUARE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 9, 4:57 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 11.7 hours before the alert went out and 189 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 757 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
926
WUUS51 KPHI 092339
SVRPHI
NJC005-007-015-021-PAC017-029-045-091-101-100045-
/O.NEW.KPHI.SV.W.0094.150709T2339Z-150710T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
739 PM EDT THU JUL 9 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MERCER COUNTY IN CENTRAL NEW JERSEY...
NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
NORTHERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
EAST CENTRAL CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHEASTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 845 PM EDT
* AT 738 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM REVERE
TO DOYLESTOWN TO NEAR AMBLER TO NEAR PAOLI...AND MOVING EAST AT 45
MPH.
* LOCATIONS IMPACTED INCLUDE...
PHILADELPHIA...TRENTON...CAMDEN...GLOUCESTER CITY...CHERRY HILL...
BENSALEM...MOUNT LAUREL...EWING...CHESTER...WILLINGBORO...
LANSDALE...EAST NORRITON...LUMBERTON...PRINCETON...FLORENCE...
BELLMAWR...YEADON...BURLINGTON...BRISTOL AND MOUNT HOLLY.
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.
&&
LAT...LON 3980 7541 3994 7553 4011 7531 4033 7528
4036 7494 4034 7494 4035 7485 4037 7486
4039 7467 4038 7462 4034 7463 4030 7457
4020 7455 4018 7461 4002 7452
TIME...MOT...LOC 2338Z 268DEG 38KT 4050 7515 4029 7514 4012 7518 4000
7550
$$
GORSE2 follow-up statements
958
WWUS51 KPHI 100008
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
808 PM EDT THU JUL 9 2015
NJC005-007-015-021-PAC017-029-045-091-101-100045-
/O.CON.KPHI.SV.W.0094.000000T0000Z-150710T0045Z/
MERCER NJ-CAMDEN NJ-GLOUCESTER NJ-BURLINGTON NJ-DELAWARE PA-
CHESTER PA-BUCKS PA-PHILADELPHIA PA-MONTGOMERY PA-
808 PM EDT THU JUL 9 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR MERCER...NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...NORTHERN
BURLINGTON...DELAWARE...EAST CENTRAL CHESTER...SOUTHEASTERN BUCKS...
PHILADELPHIA AND SOUTHEASTERN MONTGOMERY COUNTIES...
AT 805 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
CLOVERHILL TO YARDLEY TO BURLINGTON TO FOLCROFT...MOVING EAST AT 45
MPH.
AN AREA OF STRONG WIND INDICATED BY DOPPLER RADAR IS MOVING ACROSS
LOWER BUCKS COUNTY AND INTO BURLINGTON COUNTY, WITH ANOTHER AREA OF
STRONG WINDS MOVING ACROSS DELAWARE COUNTY TOWARD PHILADELPHIA.
LOCATIONS IMPACTED INCLUDE...
PHILADELPHIA...TRENTON...CAMDEN...GLOUCESTER CITY...CHERRY HILL...
BENSALEM...MOUNT LAUREL...EWING...CHESTER...WILLINGBORO...LANSDALE...
EAST NORRITON...LUMBERTON...PRINCETON...FLORENCE...BELLMAWR...
YEADON...BURLINGTON...BRISTOL AND MOUNT HOLLY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...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 THESE STORMS. MOVE INDOORS IMMEDIATELY.
REMEMBER... IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 3980 7541 3994 7553 4011 7531 4033 7528
4036 7494 4034 7494 4035 7485 4037 7486
4039 7467 4038 7462 4034 7463 4030 7457
4020 7455 4018 7461 4002 7452
TIME...MOT...LOC 0005Z 280DEG 36KT 4045 7482 4024 7481 4007 7485 3989
7528
$$
GORSE962
WWUS51 KPHI 100036
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
836 PM EDT THU JUL 9 2015
PAC029-045-100045-
/O.CAN.KPHI.SV.W.0094.000000T0000Z-150710T0045Z/
DELAWARE PA-CHESTER PA-
836 PM EDT THU JUL 9 2015
...THE SEVERE THUNDERSTORM WARNING FOR DELAWARE AND EAST CENTRAL
CHESTER COUNTIES IS CANCELLED...
THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3987 7514 4036 7494 4034 7494 4035 7485
4037 7486 4039 7467 4038 7462 4034 7463
4030 7457 4020 7455 4018 7461 4002 7452
TIME...MOT...LOC 0035Z 277DEG 27KT 4042 7454 4021 7453 4004 7457 3986
7500
$$
NJC005-007-015-021-PAC017-091-101-100045-
/O.CON.KPHI.SV.W.0094.000000T0000Z-150710T0045Z/
MERCER NJ-CAMDEN NJ-GLOUCESTER NJ-BURLINGTON NJ-BUCKS PA-
PHILADELPHIA PA-MONTGOMERY PA-
836 PM EDT THU JUL 9 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR MERCER...NORTHWESTERN CAMDEN...NORTHERN GLOUCESTER...NORTHERN
BURLINGTON...SOUTHEASTERN BUCKS...NORTHEASTERN PHILADELPHIA AND
SOUTHEASTERN MONTGOMERY COUNTIES...
AT 835 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM KENDALL
PARK TO NEAR ROOSEVELT TO NEAR WRIGHTSTOWN TO ECHELON...MOVING EAST
AT 35 MPH.
LOCATIONS IMPACTED INCLUDE...
TRENTON...CAMDEN...GLOUCESTER CITY...BENSALEM...MOUNT
LAUREL...EWING...WILLINGBORO...LUMBERTON...PRINCETON...FLORENCE...
BURLINGTON...BRISTOL...MOUNT HOLLY...RIVERSIDE...PALMYRA...
WESTVILLE...BORDENTOWN...PENNINGTON AND BEVERLY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DEADLY LIGHTNING AND
VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS
QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
IN ADDITION TO DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING
IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY.
REMEMBER... IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 3987 7514 4036 7494 4034 7494 4035 7485
4037 7486 4039 7467 4038 7462 4034 7463
4030 7457 4020 7455 4018 7461 4002 7452
TIME...MOT...LOC 0035Z 277DEG 27KT 4042 7454 4021 7453 4004 7457 3986
7500
$$
GORSEThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 48 min |
| Jul 9, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 46 min |
| Jul 9, 7:44 PM EDT | Special Marine Warning | PHI | 31 min | |
| Jul 9, 7:55 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Cumberland, Gloucester, Salem | 40 min |
| Jul 9, 7:56 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Hunterdon, Mercer, Ocean | 4 hr |
| Jul 9, 6:15 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 45 min |
| Jul 9, 6:35 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 40 min |
| Jul 9, 6:46 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Jul 9, 6:50 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 40 min |
| Jul 9, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 48 min |
| Jul 9, 7:21 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 4 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2015Severe Thunderstorm Warnings in New Jersey, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.