Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 74, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 20, 2013, 8:49 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania. It was in force for 56 min. 6 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 20, 2013, 8:49 PM EDT (00:49 UTC)
- Expired
- Jul 20, 2013, 9:45 PM EDT
- In force
- 56 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 47 km from the middle of the area, began a volume at 00:51 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 20, 8:56 PM EDT | TSTM WND GST 53 | Philadelphia Intl Airpo, PA | |
| Jul 20, 9:02 PM EDT | TSTM WND GST 66 | Philadelphia Intl Airpo, PA | |
| Jul 20, 9:05 PM EDT | TSTM WND DMG | National Park, NJ | TREES DOWN |
| Jul 20, 9:05 PM EDT | TSTM WND DMG | West Deptford Twp, NJ | WIRES DOWN ON HESSIAN AVE |
| Jul 20, 9:05 PM EDT | TSTM WND DMG | Woodbury, NJ | TREE AND WIRES DOWN |
| Jul 20, 9:05 PM EDT | TSTM WND GST 52 | Woodbury, NJ |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 0.8 hours before the alert went out and 208 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
- 1732 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 1353 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
731 WUUS51 KPHI 210049 SVRPHI NJC005-007-015-PAC045-101-210145- /O.NEW.KPHI.SV.W.0074.130721T0049Z-130721T0145Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 849 PM EDT SAT JUL 20 2013 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY... SOUTHWESTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA... EAST CENTRAL DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA... NORTH CENTRAL GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY... WEST CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY... * UNTIL 945 PM EDT * AT 847 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM. THE STORM WAS NEAR EDDYSTONE...MOVING EAST AT 30 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... PHILADELPHIA INTERNATIONAL AIRPORT AND PAULSBORO AROUND 855 PM EDT... WEST DEPTFORD AND SOUTH PHILADELPHIA AROUND 900 PM EDT... NATIONAL PARK AND WOODBURY AROUND 905 PM EDT... WESTVILLE AND GLOUCESTER CITY AROUND 910 PM EDT... BELLMAWR AROUND 915 PM EDT... MAGNOLIA AROUND 920 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS SEVERE THUNDERSTORM...WHICH COULD FLOOD LOW LYING AREAS QUICKLY AND COVER ROADS WITH WATER. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS SEVERE THUNDERSTORM. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && LAT...LON 3997 7471 3977 7469 3980 7534 3992 7535 TIME...MOT...LOC 0049Z 270DEG 24KT 3986 7530 $$ FORECASTER: HEAVENER
2 follow-up statements
795 WWUS51 KPHI 210108 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 908 PM EDT SAT JUL 20 2013 PAC045-210116- /O.CAN.KPHI.SV.W.0074.000000T0000Z-130721T0145Z/ DELAWARE PA- 908 PM EDT SAT JUL 20 2013 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL DELAWARE COUNTY IS CANCELLED... THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. LAT...LON 3980 7520 3990 7522 3997 7471 3977 7469 TIME...MOT...LOC 0106Z 270DEG 24KT 3986 7515 $$ NJC005-007-015-PAC101-210145- /O.CON.KPHI.SV.W.0074.000000T0000Z-130721T0145Z/ CAMDEN NJ-PHILADELPHIA PA-GLOUCESTER NJ-BURLINGTON NJ- 908 PM EDT SAT JUL 20 2013 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT FOR CENTRAL BURLINGTON...NORTH CENTRAL GLOUCESTER...SOUTH CENTRAL PHILADELPHIA AND NORTHERN CAMDEN COUNTIES... AT 903 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 NATIONAL PARK...OR NEAR GLOUCESTER CITY...MOVING EAST AT 30 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... BELLMAWR AND RUNNEMEDE AROUND 915 PM EDT... MAGNOLIA AND LAWNSIDE AROUND 920 PM EDT... SPRINGDALE AND GIBBSBORO AROUND 925 PM EDT... VOORHEES AND GREENTREE AROUND 930 PM EDT... EVESHAM AND MARLTON LAKES AROUND 935 PM EDT... MEDFORD LAKES AND MEDFORD AROUND 945 PM EDT... WIND GUSTS TO AT LEAST 53 MPH WERE REPORTED AT PHILADELPHIA INTERNATIONAL AIRPORT AT 856 PM. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE FOR DAMAGING WINDS...DEADLY CLOUD TO GROUND LIGHTNING AND POOR DRAINAGE FLOODING FROM BRIEF TORRENTIAL RAINS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING...AWAY FROM WINDOWS OR EVEN BELOW GROUND LEVEL. && LAT...LON 3980 7520 3990 7522 3997 7471 3977 7469 TIME...MOT...LOC 0106Z 270DEG 24KT 3986 7515 $$ FORECASTER: DRAG
054
WWUS51 KPHI 210118
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
918 PM EDT SAT JUL 20 2013
NJC015-PAC101-210126-
/O.CAN.KPHI.SV.W.0074.000000T0000Z-130721T0145Z/
PHILADELPHIA PA-GLOUCESTER NJ-
918 PM EDT SAT JUL 20 2013
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL GLOUCESTER AND
SOUTH CENTRAL PHILADELPHIA COUNTIES IS CANCELLED...
THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.
LAT...LON 3979 7508 3982 7509 3984 7508 3986 7511
3986 7512 3991 7510 3997 7471 3977 7469
TIME...MOT...LOC 0116Z 269DEG 24KT 3991 7504 3985 7505
3980 7508
$$
NJC005-007-210145-
/O.CON.KPHI.SV.W.0074.000000T0000Z-130721T0145Z/
CAMDEN NJ-BURLINGTON NJ-
918 PM EDT SAT JUL 20 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR CENTRAL BURLINGTON AND NORTHERN CAMDEN COUNTIES...
AT 912 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM COLLINGSWOOD TO RUNNEMEDE TO
BLACKWOOD...MOVING EAST AT 25 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
PINE HILL AND LINDENWOLD AROUND 925 PM EDT...
MOUNT LAUREL AND PINE VALLEY AROUND 930 PM EDT...
BERLIN AND MARLTON LAKES AROUND 935 PM EDT...
MEDFORD AND MEDFORD LAKES AROUND 940 PM EDT...
TABERNACLE AND SHAMONG AROUND 945 PM EDT...
WINDS GUSTS TO 66 MPH OCCURRED AT PHILADELPHIA INTERNATIONAL AIRPORT
AT 902 PM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM HAS A HISTORY OF PRODUCING WINDS IN EXCESS OF 60 MPH.
IF YOU ARE IN THE PATH OF THIS STORM...PREPARE FOR DAMAGING
WINDS...DEADLY CLOUD TO GROUND LIGHTNING...BRIEF TORRENTIAL RAINS
AND ASSOCIATED POOR DRAINAGE FLOODING. PEOPLE OUTSIDE SHOULD MOVE
TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING...AWAY FROM
WINDOWS OR EVEN BELOW GROUND LEVEL.
&&
LAT...LON 3979 7508 3982 7509 3984 7508 3986 7511
3986 7512 3991 7510 3997 7471 3977 7469
TIME...MOT...LOC 0116Z 269DEG 24KT 3991 7504 3985 7505
3980 7508
$$
FORECASTER: DRAGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:33 PM EDT | Special Weather Statement | PHI | Camden | 57 min |
| Jul 20, 8:39 PM EDT | Special Weather Statement | PHI | Camden | 66 min |
| Jul 20, 9:13 PM EDT | Special Weather Statement | PHI | Ocean | 32 min |
| Jul 20, 9:38 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 67 min |
| Jul 20, 9:51 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 54 min |
| Jul 20, 9:59 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 61 min |
| Jul 20, 10:07 PM EDT | Special Marine Warning | PHI | 83 min | |
| Jul 20, 10:46 PM EDT | Special Weather Statement | PHI | Burlington | 59 min |
| Jul 20, 10:52 PM EDT | Special Weather Statement | PHI | Atlantic | 53 min |
| Jul 20, 11:10 PM EDT | Special Marine Warning | PHI | 95 min | |
| Jul 21, 3:10 PM EDT | Special Weather Statement | PHI | Ocean | 65 min |
| Jul 21, 3:17 PM EDT | Coastal Flood Advisory | PHI | Middlesex, Monmouth, Ocean | 6 hr |
| Jul 21, 3:44 PM EDT | Special Weather Statement | PHI | Camden, Gloucester, Salem | 2 hr |
| Jul 21, 4:16 PM EDT | Special Weather Statement | PHI | Burlington | 89 min |
| Jul 21, 4:20 PM EDT | Areal Flood Advisory | PHI | Burlington | 3 hr |
| Jul 21, 4:44 PM EDT | Special Weather Statement | PHI | Burlington | 61 min |
| Jul 21, 5:03 PM EDT | Areal Flood Advisory | PHI | Burlington | 3 hr |
| Jul 21, 5:18 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 57 min |
| Jul 21, 5:28 PM EDT | Areal Flood Advisory | PHI | Burlington | 3 hr |
| Jul 21, 5:52 PM EDT | Special Weather Statement | PHI | Ocean | 53 min |
| Jul 21, 6:20 PM EDT | Special Weather Statement | PHI | Atlantic | 55 min |
| Jul 21, 6:33 PM EDT | Areal Flood Advisory | PHI | Burlington, Ocean | 3 hr |
| Jul 21, 7:02 PM EDT | Special Weather Statement | PHI | Atlantic | 88 min |
| Jul 21, 7:04 PM EDT | Special Marine Warning | PHI | 56 min | |
| Jul 21, 7:25 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington | 3 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2013Severe Thunderstorm Warnings in Pennsylvania, 2013Every severe thunderstorm warning in 2013
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.