Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 154, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 7, 2011, 5:12 PM EDT for 4 counties in Pennsylvania; Camden County, Gloucester County, New Jersey. It was in force for 63 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 7, 2011, 5:12 PM EDT (21:12 UTC)
- Expired
- Jul 7, 2011, 6:15 PM EDT
- In force
- 63 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Camden County, NJ, Gloucester County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 21:12 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 7, 5:51 PM EDT | TSTM WND GST 47 | Philadelphia Intl Airpo, PA | |
| Jul 7, 6:00 PM EDT | TSTM WND DMG | Paulsboro, NJ | TREES AND WIRES REPORTED DOWN IN PAULSBORO. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.2 hours before the alert went out and 87 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
- 549 J/kg
- Mixed-layer CIN
- -133 J/kg
- Mixed-layer LCL
- 1227 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
340 WUUS51 KPHI 072112 SVRPHI NJC007-015-PAC029-045-091-101-072215- /O.NEW.KPHI.SV.W.0154.110707T2112Z-110707T2215Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 512 PM EDT THU JUL 7 2011 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA... THIS INCLUDES THE CITY OF WEST CHESTER... DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA... SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA... SOUTHWESTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA... NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY... THIS INCLUDES THE CITY OF CAMDEN... NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY... * UNTIL 615 PM EDT * AT 508 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR PAOLI...OR 7 MILES NORTHEAST OF WEST CHESTER...AND MOVING EAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... GRADYVILLE AROUND 520 PM EDT... NEWTOWN SQUARE AND LIMA AROUND 525 PM EDT... RADNOR TOWNSHIP AROUND 530 PM EDT... TROUT LAKE AROUND 535 PM EDT... BROOMALL AND BRYN MAWR AROUND 540 PM EDT... SWARTHMORE AND NETHER PROVIDENCE TOWNSHIP AROUND 545 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING. && LAT...LON 3994 7503 3976 7529 3996 7569 4015 7544 TIME...MOT...LOC 2112Z 291DEG 13KT 3999 7547 $$ NIERENBERG
1 follow-up statement
318 WWUS51 KPHI 072156 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 556 PM EDT THU JUL 7 2011 PAC029-091-072205- /O.CAN.KPHI.SV.W.0154.000000T0000Z-110707T2215Z/ CHESTER PA-MONTGOMERY PA- 556 PM EDT THU JUL 7 2011 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONTGOMERY AND EAST CENTRAL CHESTER COUNTIES IS CANCELLED... THE SEVERE THUNDERSTORM HAS MOVED EAST OF THE COUNTY. LAT...LON 4000 7514 3994 7503 3976 7529 3982 7541 TIME...MOT...LOC 2155Z 242DEG 9KT 3986 7521 $$ NJC007-015-PAC045-101-072215- /O.CON.KPHI.SV.W.0154.000000T0000Z-110707T2215Z/ CAMDEN NJ-GLOUCESTER NJ-DELAWARE PA-PHILADELPHIA PA- 556 PM EDT THU JUL 7 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR SOUTHWESTERN PHILADELPHIA...SOUTHEASTERN DELAWARE...NORTHWESTERN GLOUCESTER AND NORTHWESTERN CAMDEN COUNTIES... AT 550 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR PAULSBORO...OR 8 MILES SOUTHWEST OF CAMDEN...MOVING NORTHEAST AT 10 MPH. THE PHILADELPHIA TERMINAL DOPPLER IS SHOWING A DOWNBURST ALONG THE GLOUCESTER COUNTY AND PHILADELPHIA COUNTY LINE THE SEVERE THUNDERSTORM WILL BE NEAR... NATIONAL PARK AND SOUTH PHILADELPHIA BY 605 PM EDT... GLOUCESTER CITY...WOODLYNNE...CAMDEN AND COLLINGSWOOD BY 615 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 4000 7514 3994 7503 3976 7529 3982 7541 TIME...MOT...LOC 2155Z 242DEG 9KT 3986 7521 $$ TFG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 2:27 PM EDT | Special Weather Statement | PHI | Philadelphia | 93 min |
| Jul 7, 3:05 PM EDT | Special Weather Statement | PHI | Lehigh | 55 min |
| Jul 7, 3:07 PM EDT | Special Weather Statement | PHI | Monroe | 53 min |
| Jul 7, 3:26 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 64 min |
| Jul 7, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 55 min |
| Jul 7, 1:27 PM EDT | Special Weather Statement | PHI | Burlington | 93 min |
| Jul 7, 3:11 PM EDT | Special Weather Statement | PHI | Atlantic | 64 min |
| Jul 7, 3:15 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 45 min |
| Jul 7, 3:16 PM EDT | Special Marine Warning | PHI | 89 min | |
| Jul 7, 3:45 PM EDT | Special Weather Statement | PHI | Mercer, Middlesex | 90 min |
| Jul 7, 3:46 PM EDT | Special Weather Statement | PHI | Burlington | 89 min |
| Jul 7, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 34 min |
| Jul 7, 4:17 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 88 min |
| Jul 7, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 46 min |
| Jul 7, 4:48 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 57 min |
| Jul 7, 5:44 PM EDT | Special Weather Statement | PHI | Burlington, Monmouth, Ocean | 61 min |
| Jul 7, 6:10 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 40 min |
| Jul 7, 6:46 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Somerset | 74 min |
| Jul 7, 6:48 PM EDT | Special Weather Statement | PHI | Camden | 57 min |
| Jul 7, 7:32 PM EDT | Special Weather Statement | PHI | Atlantic, Burlington, Cape May, Cumberland, Salem | 88 min |
| Jul 7, 7:49 PM EDT | Special Weather Statement | PHI | Mercer | 86 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2011Severe Thunderstorm Warnings in New Jersey, 2011Every severe thunderstorm warning in 2011
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.