Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 17, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2015, 5:25 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey; 5 counties in Pennsylvania; New Castle County, Delaware. It was in force for 44 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
- May 27, 2015, 5:25 PM EDT (21:25 UTC)
- Expired
- May 27, 2015, 6:09 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 57 km from the middle of the area, began a volume at 21:28 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 27, 12:54 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.4 hours before the alert went out and 106 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
- 428 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 589 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
880 WUUS51 KPHI 272125 SVRPHI DEC003-NJC005-007-015-PAC017-029-045-091-101-272230- /O.NEW.KPHI.SV.W.0017.150527T2125Z-150527T2230Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 525 PM EDT WED MAY 27 2015 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE... NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY... NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY... NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY... SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA... DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA... PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA... SOUTHEASTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA... EAST CENTRAL CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA... * UNTIL 630 PM EDT * AT 524 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED OVER GRADYVILLE...PENNSYLVANIA...AND MOVING NORTHEAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... PHILADELPHIA...CAMDEN...GLOUCESTER CITY...BENSALEM...CHESTER... WILLINGBORO...FLORENCE...YEADON...WESTTOWN...BURLINGTON... BRISTOL...MOUNT HOLLY...RIVERSIDE...CONSHOHOCKEN...PALMYRA... HATBORO...FOLCROFT...SWARTHMORE...PAULSBORO AND JENKINTOWN. 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. && LAT...LON 4003 7468 3977 7549 3991 7561 4027 7493 TIME...MOT...LOC 2124Z 239DEG 38KT 3992 7547 $$ IOVINO
2 follow-up statements
339
WWUS51 KPHI 272158
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
558 PM EDT WED MAY 27 2015
DEC003-PAC029-272206-
/O.CAN.KPHI.SV.W.0017.000000T0000Z-150527T2230Z/
NEW CASTLE DE-CHESTER PA-
558 PM EDT WED MAY 27 2015
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE AND
EAST CENTRAL CHESTER COUNTIES IS CANCELLED...
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF
NEW CASTLE COUNTY AND CHESTER COUNTY. THEREFORE THE WARNING HAS BEEN
CANCELLED.
LAT...LON 4003 7468 3981 7538 4004 7536 4027 7493
TIME...MOT...LOC 2156Z 239DEG 38KT 4010 7509
$$
NJC005-007-015-PAC017-045-091-101-272230-
/O.CON.KPHI.SV.W.0017.000000T0000Z-150527T2230Z/
BURLINGTON NJ-GLOUCESTER NJ-CAMDEN NJ-MONTGOMERY PA-DELAWARE PA-
PHILADELPHIA PA-BUCKS PA-
558 PM EDT WED MAY 27 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHWESTERN BURLINGTON...NORTHWESTERN GLOUCESTER...NORTHWESTERN
CAMDEN...SOUTHEASTERN MONTGOMERY...EASTERN DELAWARE...PHILADELPHIA
AND SOUTHEASTERN BUCKS COUNTIES...
AT 556 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED OVER EASTERN DELAWARE COUNTY...MOVING NORTHEAST AT 40 MPH.
LOCATIONS IMPACTED INCLUDE...
PHILADELPHIA...CAMDEN...GLOUCESTER CITY...BENSALEM...CHESTER...
WILLINGBORO...FLORENCE...YEADON...BURLINGTON...BRISTOL...RIVERSIDE...
CONSHOHOCKEN...PALMYRA...HATBORO...FOLCROFT...SWARTHMORE...
PAULSBORO...JENKINTOWN...WESTVILLE AND NARBERTH.
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.
&&
LAT...LON 4003 7468 3981 7538 4004 7536 4027 7493
TIME...MOT...LOC 2156Z 239DEG 38KT 4010 7509
$$
IOVINO876
WWUS51 KPHI 272209
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
609 PM EDT WED MAY 27 2015
NJC005-007-015-PAC017-045-091-101-272218-
/O.CAN.KPHI.SV.W.0017.000000T0000Z-150527T2230Z/
BURLINGTON NJ-GLOUCESTER NJ-CAMDEN NJ-MONTGOMERY PA-DELAWARE PA-
PHILADELPHIA PA-BUCKS PA-
609 PM EDT WED MAY 27 2015
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BURLINGTON...
NORTHWESTERN GLOUCESTER...NORTHWESTERN CAMDEN...SOUTHEASTERN
MONTGOMERY...EASTERN DELAWARE...PHILADELPHIA AND SOUTHEASTERN BUCKS
COUNTIES IS CANCELLED...
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED.
THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 4003 7468 3981 7538 4004 7536 4027 7493
TIME...MOT...LOC 2205Z 239DEG 38KT 4017 7494
$$
IOVINOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 4:11 AM EDT | Small Craft Advisory | PHI | 25 hr | |
| May 27, 5:48 PM EDT | Special Weather Statement | PHI | Mercer, Middlesex | 57 min |
| May 27, 2:23 PM EDT | Special Weather Statement | PHI | Lebanon | 22 min |
| May 27, 2:48 PM EDT | Special Weather Statement | PHI | Carbon | 27 min |
| May 27, 2:53 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 52 min |
| May 27, 3:06 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 54 min |
| May 27, 3:13 PM EDT | Special Weather Statement | PHI | Berks | 62 min |
| May 27, 3:53 PM EDT | Special Weather Statement | PHI | Monroe | 37 min |
| May 27, 4:26 PM EDT | Special Weather Statement | PHI | Chester | 64 min |
| May 27, 4:36 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 39 min |
| May 27, 5:07 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery | 53 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2015Severe Thunderstorm Warnings in New Jersey, 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.