Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 229, NWS Philadelphia/Mount Holly

August 1, 2011New Castle County, Delaware; Chester County, Delaware County, Pennsylvania; Gloucester County, Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2011, 6:20 PM EDT for New Castle County, Delaware; Chester County, Delaware County, Pennsylvania; Gloucester County, Salem County, New Jersey. It was in force for 46 min. 3 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: Aug 1, 2011, 6:20 PM EDT (22:20 UTC)
Expired: Aug 1, 2011, 7:06 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA

What was reported inside it

Time	Report	Where	Remark
Aug 1, 6:20 PM EDT	TSTM WND DMG	Carneys Point, NJ	WIRES DOWN.
Aug 1, 6:24 PM EDT	HAIL 1	Boothwyn, PA	QUARTER SIZE HAIL REPORTED IN BOOTHWYN.
Aug 1, 6:25 PM EDT	HAIL 1	Garnet Valley, PA	QUARTER SIZE HAIL REPORTED IN BOOTHWYN.

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, 10.3 hours before the alert went out and 54 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 307 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 1512 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -192 m²/s²
0-3 km storm-relative helicity: -166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

482 
WUUS51 KPHI 012220
SVRPHI
DEC003-NJC015-033-PAC029-045-012315-
/O.NEW.KPHI.SV.W.0229.110801T2220Z-110801T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
620 PM EDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF WILMINGTON...
  SOUTH CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHWESTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  WEST CENTRAL GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 715 PM EDT

* AT 617 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
  ASHLAND...OR 9 MILES SOUTH OF WEST CHESTER...AND MOVING SOUTHEAST
  AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TALLEYVILLE...ELSMERE AND ARDEN AROUND 625 PM EDT...
  WILMINGTON...NEWPORT AND WILMINGTON MANOR AROUND 630 PM EDT...
  CARNEYS POINT AND PENNS GROVE AROUND 635 PM EDT...
  PENNSVILLE AROUND 640 PM EDT...
  WOODSTOWN AROUND 650 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.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3980 7573 3994 7549 3954 7517 3953 7520
      3955 7524 3948 7533 3943 7548 3945 7554
      3950 7557 3952 7554 3957 7553 3958 7556
      3953 7557 3952 7558
TIME...MOT...LOC 2220Z 317DEG 32KT 3982 7560

$$

TFG

2 follow-up statements

465 
WWUS51 KPHI 012248
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
648 PM EDT MON AUG 1 2011

DEC003-PAC029-045-012258-
/O.CAN.KPHI.SV.W.0229.000000T0000Z-110801T2315Z/
DELAWARE PA-CHESTER PA-NEW CASTLE DE-
648 PM EDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
SOUTH CENTRAL CHESTER AND SOUTHWESTERN DELAWARE COUNTIES IS
CANCELLED...

THE SEVERE STORM IS IN NEW JERSEY.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

LAT...LON 3953 7520 3955 7524 3947 7537 3943 7549
      3954 7545 3956 7549 3959 7550 3958 7548
      3960 7551 3969 7551 3980 7538 3955 7518
TIME...MOT...LOC 2248Z 317DEG 32KT 3968 7532

$$

NJC015-033-012315-
/O.CON.KPHI.SV.W.0229.000000T0000Z-110801T2315Z/
SALEM NJ-GLOUCESTER NJ-
648 PM EDT MON AUG 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR WEST CENTRAL GLOUCESTER AND CENTRAL SALEM COUNTIES...

AT 646 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR WOODSTOWN...OR 11 MILES EAST OF WILMINGTON...MOVING
SOUTHEAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  7 MILES NORTHEAST OF ALLOWAY BY 655 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3953 7520 3955 7524 3947 7537 3943 7549
      3954 7545 3956 7549 3959 7550 3958 7548
      3960 7551 3969 7551 3980 7538 3955 7518
TIME...MOT...LOC 2248Z 317DEG 32KT 3968 7532

$$

TFG

635 
WWUS51 KPHI 012306
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
706 PM EDT MON AUG 1 2011

NJC015-033-012316-
/O.CAN.KPHI.SV.W.0229.000000T0000Z-110801T2315Z/
SALEM NJ-GLOUCESTER NJ-
706 PM EDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL GLOUCESTER AND
CENTRAL SALEM COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM IS NOW SOUTH OF THE AREA.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

LAT...LON 3953 7520 3955 7524 3947 7537 3943 7549
      3954 7545 3956 7549 3959 7550 3958 7548
      3960 7551 3969 7551 3980 7538 3955 7518
TIME...MOT...LOC 2306Z 317DEG 32KT 3956 7518

$$

TFG

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 1, 3:15 PM EDT	Special Weather Statement	PHI	Sussex	45 min
Aug 1, 3:38 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	37 min
Aug 1, 3:59 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 1, 4:46 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	48 min
Aug 1, 7:31 PM EDT	Special Weather Statement	PHI	Kent, New Castle, Sussex	119 min
Jul 31, 10:00 PM EDT	Special Weather Statement	PHI	Chester	60 min
Aug 1, 1:35 PM EDT	Special Weather Statement	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Aug 1, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	51 min
Aug 1, 3:46 PM EDT	Special Weather Statement	PHI	Berks	89 min
Aug 1, 4:00 PM EDT	Severe Thunderstorm Warning	PHI	Berks	75 min
Aug 1, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	87 min
Aug 1, 4:39 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	42 min
Aug 1, 5:11 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery, Philadelphia	2 hr
Aug 1, 5:37 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Philadelphia	53 min
Aug 1, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	70 min
Aug 1, 6:17 PM EDT	Areal Flood Advisory	PHI	Delaware, Philadelphia	3 hr
Jul 31, 10:13 PM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Somerset	62 min
Jul 31, 10:58 PM EDT	Special Weather Statement	PHI	Morris	62 min
Aug 1, 1:49 AM EDT	Special Marine Warning	PHI		56 min
Aug 1, 1:50 AM EDT	Special Weather Statement	PHI	Monmouth	55 min
Aug 1, 2:11 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	94 min
Aug 1, 2:44 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	29 min
Aug 1, 4:09 PM EDT	Special Weather Statement	PHI	Camden	66 min
Aug 1, 5:06 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	69 min
Aug 1, 6:03 PM EDT	Special Marine Warning	PHI		57 min
Aug 1, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	59 min
Aug 1, 6:47 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester, Salem	73 min
Aug 1, 7:01 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cumberland, Gloucester, Salem	119 min
Aug 1, 7:07 PM EDT	Special Marine Warning	PHI		83 min
Aug 1, 7:12 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	59 min
Aug 1, 7:17 PM EDT	Special Marine Warning	PHI		118 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011 Severe Thunderstorm Warnings in New Jersey, 2011 Severe Thunderstorm Warnings in Delaware, 2011 Every 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.