Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 106, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 4, 2015, 4:20 AM EDT for 4 states. It was in force for 33 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
- Aug 4, 2015, 4:20 AM EDT (08:20 UTC)
- Expired
- Aug 4, 2015, 4:53 AM EDT
- In force
- 33 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Cecil County, MD, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA
The radar
The Dover AFB radar (KDOX), 105 km from the middle of the area, began a volume at 08:20 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, 8.3 hours before the alert went out and 169 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
- 627 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 1863 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
683
WUUS51 KPHI 040820
SVRPHI
DEC003-MDC015-NJC015-033-PAC029-045-040915-
/O.NEW.KPHI.SV.W.0106.150804T0820Z-150804T0915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
420 AM EDT TUE AUG 4 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
NORTHWESTERN CECIL COUNTY IN NORTHEASTERN MARYLAND...
NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...
NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
SOUTHERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHWESTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 515 AM EDT
* AT 419 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED OVER WAKEFIELD...OR 17 MILES
NORTH OF ABERDEEN...AND MOVING EAST AT 40 MPH.
* LOCATIONS IMPACTED INCLUDE...
WILMINGTON...NEWARK...CALVERT...CHESTER...PENNSVILLE...YEADON...
CARNEYS POINT...FOLCROFT...SWARTHMORE...ELSMERE...PAULSBORO...
KENNETT SQUARE...NEW CASTLE...PENNS GROVE...OXFORD...WOODSTOWN...
WEST GROVE...RISING SUN...SWEDESBORO AND NEWPORT.
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 LARGE HAIL AND 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 3973 7610 3976 7606 3983 7604 3987 7599
3990 7599 3993 7525 3988 7526 3987 7523
3963 7522 3964 7546 3966 7548 3964 7548
3964 7555 3971 7549 3972 7551 3964 7560
3965 7616 3968 7620 3972 7621
TIME...MOT...LOC 0819Z 267DEG 36KT 3976 7613
$$
HEAVENER2 follow-up statements
073
WWUS51 KPHI 040847
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
447 AM EDT TUE AUG 4 2015
MDC015-040856-
/O.CAN.KPHI.SV.W.0106.000000T0000Z-150804T0915Z/
CECIL MD-
447 AM EDT TUE AUG 4 2015
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CECIL COUNTY IS
CANCELLED...
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3993 7525 3988 7526 3987 7523 3974 7522
3976 7549 3980 7580 3991 7581
TIME...MOT...LOC 0846Z 267DEG 36KT 3977 7581
$$
DEC003-NJC015-033-PAC029-045-040915-
/O.CON.KPHI.SV.W.0106.000000T0000Z-150804T0915Z/
NEW CASTLE DE-SALEM NJ-GLOUCESTER NJ-DELAWARE PA-CHESTER PA-
447 AM EDT TUE AUG 4 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 AM EDT
FOR NORTHEASTERN NEW CASTLE...NORTHWESTERN SALEM...NORTHWESTERN
GLOUCESTER...SOUTHERN DELAWARE AND SOUTH CENTRAL CHESTER COUNTIES...
AT 446 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60
MPH. THIS STORM WAS LOCATED OVER KEMBLESVILLE...OR 7 MILES NORTHWEST
OF NEWARK. THIS STORM WAS NEARLY STATIONARY.
LOCATIONS IMPACTED INCLUDE...
WILMINGTON...CHESTER...YEADON...FOLCROFT...SWARTHMORE...PAULSBORO...
KENNETT SQUARE...SWEDESBORO...ARDEN...GIBBSTOWN...PHILADELPHIA
INTERNATIONAL AIRPORT...PHILADELPHIA INTERNATIONAL ARPT...ELAM...
TALLEYVILLE...NETHER PROVIDENCE TOWNSHIP...CHELSEA...GREENVILLE...
LIMA...CHESTER TOWNSHIP AND CONCORDVILLE.
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.
IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 3993 7525 3988 7526 3987 7523 3974 7522
3976 7549 3980 7580 3991 7581
TIME...MOT...LOC 0846Z 267DEG 36KT 3977 7581
$$
HEAVENER331
WWUS51 KPHI 040853
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
453 AM EDT TUE AUG 4 2015
DEC003-NJC015-033-PAC029-045-040902-
/O.CAN.KPHI.SV.W.0106.000000T0000Z-150804T0915Z/
NEW CASTLE DE-SALEM NJ-GLOUCESTER NJ-DELAWARE PA-CHESTER PA-
453 AM EDT TUE AUG 4 2015
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
NORTHWESTERN SALEM...NORTHWESTERN GLOUCESTER...SOUTHERN DELAWARE AND
SOUTH CENTRAL CHESTER COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3993 7525 3988 7526 3987 7523 3974 7522
3976 7549 3980 7580 3991 7581
TIME...MOT...LOC 0852Z 267DEG 36KT 3977 7572
$$
HEAVENERThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 12:06 AM EDT | Special Weather Statement | PHI | Chester | 54 min |
| Aug 4, 12:45 AM EDT | Special Weather Statement | PHI | Bucks, Chester, Montgomery, Philadelphia | 60 min |
| Aug 4, 1:23 AM EDT | Special Weather Statement | PHI | Berks | 37 min |
| Aug 4, 1:31 AM EDT | Severe Thunderstorm Warning | PHI | Berks | 44 min |
| Aug 4, 1:42 AM EDT | Special Weather Statement | PHI | Carbon | 48 min |
| Aug 4, 1:54 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 50 min |
| Aug 4, 2:07 AM EDT | Special Weather Statement | PHI | Bucks | 53 min |
| Aug 4, 2:56 AM EDT | Special Weather Statement | PHI | Bucks | 64 min |
| Aug 4, 4:12 AM EDT | Special Weather Statement | PHI | Chester, Delaware | 63 min |
| Aug 4, 2:30 AM EDT | Special Weather Statement | PHI | Morris, Warren | 60 min |
| Aug 4, 3:33 AM EDT | Special Marine Warning | PHI | 57 min | |
| Aug 4, 3:36 AM EDT | Special Weather Statement | PHI | Morris | 24 min |
| Aug 4, 5:25 AM EDT | Special Weather Statement | PHI | Monmouth | 65 min |
| Aug 4, 10:53 AM EDT | Rip Current Statement | PHI | Cape May | 4 hr |
| Aug 4, 5:37 AM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 34 min |
| Aug 4, 6:11 PM EDT | Special Weather Statement | PHI | Sussex | 64 min |
| Aug 4, 6:20 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 20 min |
| Aug 4, 5:18 AM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 57 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.