Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 77, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 20, 2013, 9:59 PM EDT for Montgomery County, Philadelphia County, Pennsylvania; Burlington County, Camden County, New Jersey. It was in force for 61 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
- Jul 20, 2013, 9:59 PM EDT (01:59 UTC)
- Expired
- Jul 20, 2013, 11:00 PM EDT
- In force
- 61 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Burlington County, NJ, Camden County, NJ, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 56 km from the middle of the area, began a volume at 01:59 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
Brookhaven, NY (KOKX), launched 00:00Z, 2.0 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.
513
WUUS51 KPHI 210159
SVRPHI
NJC005-007-PAC091-101-210300-
/O.NEW.KPHI.SV.W.0077.130721T0159Z-130721T0300Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
959 PM EDT SAT JUL 20 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
* UNTIL 1100 PM EDT
* AT 955 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM. THE STORM WAS NEAR BRYN MAWR...MOVING EAST AT
15 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
CHESTNUT HILL AROUND 1005 PM EDT...
GERMANTOWN AND ROXBOROUGH AROUND 1010 PM EDT...
JENKINTOWN AROUND 1020 PM EDT...
PHILADELPHIA AND KENSINGTON AROUND 1025 PM EDT...
CAMDEN AROUND 1030 PM EDT...
WISSINOMING AND TACONY AROUND 1035 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.
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 3989 7499 3999 7529 4002 7532 4014 7524
4008 7496 4007 7498 4005 7497 4007 7494
4006 7487
TIME...MOT...LOC 0158Z 283DEG 15KT 4004 7526
$$
FORECASTER: HEAVENER2 follow-up statements
832
WWUS51 KPHI 210220
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1020 PM EDT SAT JUL 20 2013
PAC091-210230-
/O.CAN.KPHI.SV.W.0077.000000T0000Z-130721T0300Z/
MONTGOMERY PA-
1020 PM EDT SAT JUL 20 2013
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY COUNTY
IS CANCELLED...
THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.
LAT...LON 4003 7489 3989 7499 3992 7509 3997 7517
4005 7511 4006 7509 4007 7510 4008 7509
4008 7508
TIME...MOT...LOC 0220Z 283DEG 15KT 4002 7514
$$
NJC005-007-PAC101-210300-
/O.CON.KPHI.SV.W.0077.000000T0000Z-130721T0300Z/
CAMDEN NJ-PHILADELPHIA PA-BURLINGTON NJ-
1020 PM EDT SAT JUL 20 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR WEST CENTRAL BURLINGTON...CENTRAL PHILADELPHIA AND NORTHWESTERN
CAMDEN COUNTIES...
AT 1016 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 PHILADELPHIA...MOVING
EAST AT 15 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
PHILADELPHIA AND KENSINGTON AROUND 1025 PM EDT...
CAMDEN AROUND 1030 PM EDT...
WISSINOMING AND TACONY AROUND 1035 PM EDT...
PALMYRA AND PENNSAUKEN AROUND 1040 PM EDT...
RIVERTON AROUND 1045 PM EDT...
CINNAMINSON AND MAPLE SHADE AROUND 1050 PM EDT...
LAT...LON 4003 7489 3989 7499 3992 7509 3997 7517
4005 7511 4006 7509 4007 7510 4008 7509
4008 7508
TIME...MOT...LOC 0220Z 283DEG 15KT 4002 7514
$$
FORECASTER: HEAVENER624
WWUS51 KPHI 210236
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1036 PM EDT SAT JUL 20 2013
NJC005-007-PAC101-210246-
/O.CAN.KPHI.SV.W.0077.000000T0000Z-130721T0300Z/
CAMDEN NJ-PHILADELPHIA PA-BURLINGTON NJ-
1036 PM EDT SAT JUL 20 2013
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BURLINGTON...
CENTRAL PHILADELPHIA AND NORTHWESTERN CAMDEN COUNTIES IS CANCELLED...
THE STORM HAS WEAKENED TO BELOW SEVERE LIMITS...THEREFORE THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.
LAT...LON 4003 7489 3989 7499 3992 7509 3997 7517
4005 7511 4006 7509 4007 7510 4008 7509
4008 7508
TIME...MOT...LOC 0236Z 283DEG 15KT 4000 7506
$$
FORECASTER: HEAVENERThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:39 PM EDT | Special Weather Statement | PHI | Delaware | 66 min |
| Jul 20, 8:49 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 56 min |
| Jul 21, 3:44 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 2 hr |
| Jul 21, 5:03 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Jul 20, 8:33 PM EDT | Special Weather Statement | PHI | Camden | 57 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, 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, 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, 5:18 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 Pennsylvania, 2013Severe Thunderstorm Warnings in New Jersey, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.