Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 65, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 7, 2013, 7:27 PM EDT for Chester County, Delaware County, Pennsylvania; New Castle County, Delaware; Salem County, New Jersey. It was in force for 48 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 7, 2013, 7:27 PM EDT (23:27 UTC)
- Expired
- Jul 7, 2013, 8:15 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Salem County, NJ, Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 23:28 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 |
|---|---|---|---|
| Jul 7, 4:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.5 hours before the alert went out and 183 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
- 285 J/kg
- Mixed-layer CIN
- -180 J/kg
- Mixed-layer LCL
- 1178 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
443
WUUS51 KPHI 072327
SVRPHI
DEC003-NJC033-PAC029-045-080015-
/O.NEW.KPHI.SV.W.0065.130707T2327Z-130708T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
727 PM EDT SUN JUL 7 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...
* UNTIL 815 PM EDT
* AT 725 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
KENNETT SQUARE TO GLEN WESTOVER...MOVING EAST AT 20 MPH. THESE
STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
PIKE CREEK AND HOCKESSIN AROUND 735 PM EDT...
ASHLAND AROUND 740 PM EDT...
STANTON AROUND 745 PM EDT...
WESTTOWN AND WILMINGTON MANOR AROUND 750 PM EDT...
CONCORDVILLE AND CHEYNEY AROUND 755 PM EDT...
WILMINGTON AROUND 800 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.
THIS LINE OF SEVERE THUNDERSTORMS HAS A HISTORY OF PRODUCING WIND
DAMAGE IN WESTERN CHESTER COUNTY. DO NOT STAY OUTDOORS.
VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE OF SEVERE
THUNDERSTORMS...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 LINE OF
SEVERE THUNDERSTORMS. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SUNDAY EVENING FOR NORTHEAST MARYLAND AND NEW JERSEY AND EASTERN
PENNSYLVANIA.
&&
LAT...LON 3992 7575 3996 7535 3981 7540 3979 7542
3978 7541 3966 7545 3967 7553 3969 7552
3968 7554 3967 7554 3971 7579 3973 7580
TIME...MOT...LOC 2326Z 269DEG 18KT 3987 7571 3972 7576
$$
FORECASTER: DRAG2 follow-up statements
577
WWUS51 KPHI 072348
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
748 PM EDT SUN JUL 7 2013
PAC029-072356-
/O.CAN.KPHI.SV.W.0065.000000T0000Z-130708T0015Z/
CHESTER PA-
748 PM EDT SUN JUL 7 2013
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHESTER COUNTY IS
CANCELLED...
THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SUNDAY EVENING FOR NORTHEAST MARYLAND AND NEW JERSEY AND EASTERN
PENNSYLVANIA.
LAT...LON 3975 7565 3985 7557 3995 7545 3996 7535
3981 7540 3979 7542 3978 7541 3966 7545
3967 7553 3969 7552 3968 7554 3967 7554
3969 7567
TIME...MOT...LOC 2346Z 286DEG 18KT 3982 7552 3970 7563
$$
DEC003-NJC033-PAC045-080015-
/O.CON.KPHI.SV.W.0065.000000T0000Z-130708T0015Z/
DELAWARE PA-NEW CASTLE DE-SALEM NJ-
748 PM EDT SUN JUL 7 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR NORTHWESTERN SALEM...NORTHEASTERN NEW CASTLE AND SOUTHWESTERN
DELAWARE COUNTIES...
AT 743 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS OF NEAR 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM TALLEYVILLE TO STANTON...MOVING EAST AT 20 MPH AND
WEAKENING A BIT.
SEVERE THUNDERSTORMS WILL BE NEAR...
BOOTHWYN AND LIMA AROUND 755 PM EDT...
MARCUS HOOK AND LINWOOD AROUND 800 PM EDT...
TRAINER AND PENNS GROVE AROUND 805 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THIS STORM...PREPARE FOR POTENTIALLY
DAMAGING WINDS...BRIEF HEAVY RAIN AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING.
&&
LAT...LON 3975 7565 3985 7557 3995 7545 3996 7535
3981 7540 3979 7542 3978 7541 3966 7545
3967 7553 3969 7552 3968 7554 3967 7554
3969 7567
TIME...MOT...LOC 2346Z 286DEG 18KT 3982 7552 3970 7563
$$
FORECASTER: DRAG473
WWUS51 KPHI 072356
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
756 PM EDT SUN JUL 7 2013
DEC003-NJC033-PAC045-080005-
/O.CAN.KPHI.SV.W.0065.000000T0000Z-130708T0015Z/
DELAWARE PA-NEW CASTLE DE-SALEM NJ-
756 PM EDT SUN JUL 7 2013
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SALEM...
NORTHEASTERN NEW CASTLE AND SOUTHWESTERN DELAWARE COUNTIES IS
CANCELLED...
THE LINE OF STORMS HAVE WEAKENED TO BELOW SEVERE LIMITS...THEREFORE
THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.
WEST TO NORTHWEST WIND GUSTS OF 45 MPH ARE STILL POSSIBLE BUT NOT 60
MPH.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SUNDAY EVENING FOR NORTHEAST MARYLAND AND NEW JERSEY AND EASTERN
PENNSYLVANIA.
LAT...LON 3975 7565 3985 7557 3995 7545 3996 7535
3981 7540 3979 7542 3978 7541 3966 7545
3967 7553 3969 7552 3968 7554 3967 7554
3969 7567
TIME...MOT...LOC 2355Z 286DEG 18KT 3981 7546 3969 7557
$$
FORECASTER: DRAGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 3:57 PM EDT | Special Weather Statement | PHI | Berks, Carbon, Lehigh, Monroe | 3 hr |
| Jul 7, 4:41 PM EDT | Special Weather Statement | PHI | Berks, Carbon, Chester, Lehigh, Northampton | 2 hr |
| Jul 7, 5:11 PM EDT | Special Weather Statement | PHI | Berks, Carbon | 64 min |
| Jul 7, 5:31 PM EDT | Special Weather Statement | PHI | Berks, Carbon | 59 min |
| Jul 7, 5:56 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 49 min |
| Jul 7, 6:12 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 48 min |
| Jul 7, 6:20 PM EDT | Special Weather Statement | PHI | Berks, Chester | 40 min |
| Jul 7, 6:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 61 min |
| Jul 7, 6:51 PM EDT | Special Weather Statement | PHI | Montgomery | 39 min |
| Jul 7, 7:08 PM EDT | Special Weather Statement | PHI | Montgomery | 37 min |
| Jul 7, 7:22 PM EDT | Special Weather Statement | PHI | Delaware | 38 min |
| Jul 7, 7:34 PM EDT | Special Weather Statement | PHI | Bucks | 41 min |
| Jul 7, 7:53 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 52 min |
| Jul 7, 2:01 PM EDT | Areal Flood Advisory | PHI | Sussex | 119 min |
| Jul 7, 2:32 PM EDT | Special Weather Statement | PHI | Sussex | 13 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2013Severe Thunderstorm Warnings in Delaware, 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.