Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 277, NWS Philadelphia/Mount Holly

August 19, 20114 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2011, 6:14 PM EDT for 4 states. It was in force for 65 min. 4 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 19, 2011, 6:14 PM EDT (22:14 UTC)
Expired: Aug 19, 2011, 7:19 PM EDT
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 92 km from the middle of the area, began a volume at 22:14 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
Aug 19, 6:15 PM EDT	HAIL 0.88	West Chester, PA
Aug 19, 6:20 PM EDT	TSTM WND DMG	Norristown, PA	BRANCHES DOWN
Aug 19, 6:20 PM EDT	TSTM WND DMG	West Chester, PA	LARGE BRANCHES DOWN
Aug 19, 6:30 PM EDT	TSTM WND DMG	Newark, DE	TREES AND WIRES DOWN AROUND THE NEWARK AREA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 19, 1:04 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.2 hours before the alert went out and 62 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: 146 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 359 m²/s²
0-3 km storm-relative helicity: 370 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

842 
WUUS51 KPHI 192214
SVRPHI
DEC003-MDC015-NJC005-007-015-021-033-PAC017-029-045-091-101-192330-
/O.NEW.KPHI.SV.W.0277.110819T2214Z-110819T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
614 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  EAST CENTRAL CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF ELKTON...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITIES OF...WILMINGTON...NEWARK...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WEST CHESTER...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  NORTHERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 730 PM EDT

* AT 609 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM NORRISTOWN TO KENNETT SQUARE TO
  ELKTON...OR ALONG A LINE EXTENDING FROM 17 MILES NORTHEAST OF WEST
  CHESTER TO 11 MILES SOUTHWEST OF WEST CHESTER TO ELKTON...AND
  MOVING EAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WESTTOWN...HOCKESSIN...GLASGOW AND NORRISTOWN AROUND 620 PM EDT...
  CHEYNEY...MOUNT PLEASANT...BEAR AND ASHLAND AROUND 625 PM EDT...
  AMBLER AND NEWTOWN SQUARE AROUND 630 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS LINE OF STORMS. 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

&&

LAT...LON 3975 7503 3946 7539 3944 7543 3947 7555
      3950 7557 3952 7554 3958 7554 3958 7556
      3954 7555 3948 7559 3953 7585 3987 7572
      4026 7536 4022 7464
TIME...MOT...LOC 2214Z 281DEG 25KT 4015 7537 3986 7573
          3958 7579

$$

TFG

2 follow-up statements

001 
WWUS51 KPHI 192300
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
700 PM EDT FRI AUG 19 2011

MDC015-PAC029-192310-
/O.CAN.KPHI.SV.W.0277.000000T0000Z-110819T2330Z/
CECIL MD-CHESTER PA-
700 PM EDT FRI AUG 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHESTER AND EAST
CENTRAL CECIL COUNTIES IS CANCELLED...

THE LINE OF SEVERE STORMS IS EAST 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

LAT...LON 3976 7503 3946 7539 3944 7543 3948 7555
      3950 7557 3952 7554 3959 7554 3959 7556
      3958 7556 3954 7555 3949 7559 3953 7565
      3984 7553 4025 7511 4022 7464
TIME...MOT...LOC 2300Z 127DEG 27KT 4013 7509 3984 7546
          3957 7551

$$

DEC003-NJC005-007-015-021-033-PAC017-045-091-101-192330-
/O.CON.KPHI.SV.W.0277.000000T0000Z-110819T2330Z/
SALEM NJ-CAMDEN NJ-GLOUCESTER NJ-MERCER NJ-DELAWARE PA-
PHILADELPHIA PA-MONTGOMERY PA-BUCKS PA-NEW CASTLE DE-BURLINGTON NJ-
700 PM EDT FRI AUG 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHWESTERN BURLINGTON...NORTHEASTERN NEW CASTLE...SOUTHEASTERN
BUCKS...SOUTHEASTERN MONTGOMERY...PHILADELPHIA...DELAWARE...SOUTH
CENTRAL MERCER...NORTHERN GLOUCESTER...NORTHWESTERN CAMDEN AND SALEM
COUNTIES...

AT 656 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED.  THESE
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM BRYN ATHYN TO LINWOOD
TO SALEM...OR ALONG A LINE EXTENDING FROM 9 MILES NORTHEAST OF
PHILADELPHIA TO 9 MILES NORTHEAST OF WILMINGTON TO 13 MILES SOUTH OF
WILMINGTON...MOVING NORTHWEST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PORT
PENN...GLENSIDE...PENNSVILLE...MEDIA...ARDENTOWN...ARDENCROFT...
WYNDMOOR...WILLOW GROVE...ARDMORE...CHELSEA...BELLEFONTE...ARDEN...
WARMINSTER HEIGHTS...CHESTNUT HILL...IVYLAND...EDGEMOOR...HATBORO...
BROOMALL...UPPER PROVIDENCE TOWNSHIP...ORELAND...CHESTER HEIGHTS...
LIMA...FLOURTOWN...BRYN MAWR...TROUT LAKE...HORSHAM...DELAWARE
CITY...FORT WASHINGTON...NEW CASTLE AND WILMINGTON MANOR

IF YOU SEE THREATENING WEATHER, MOVE INDOORS QUICKLY.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

LAT...LON 3976 7503 3946 7539 3944 7543 3948 7555
      3950 7557 3952 7554 3959 7554 3959 7556
      3958 7556 3954 7555 3949 7559 3953 7565
      3984 7553 4025 7511 4022 7464
TIME...MOT...LOC 2300Z 127DEG 27KT 4013 7509 3984 7546
          3957 7551

$$

TFG

483 
WWUS51 KPHI 192319 RRA
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
719 PM EDT FRI AUG 19 2011

DEC003-NJC005-007-015-021-033-PAC017-045-091-101-192329-
/O.CAN.KPHI.SV.W.0277.000000T0000Z-110819T2330Z/
SALEM NJ-CAMDEN NJ-GLOUCESTER NJ-MERCER NJ-DELAWARE PA-
PHILADELPHIA PA-MONTGOMERY PA-BUCKS PA-NEW CASTLE DE-BURLINGTON NJ-
719 PM EDT FRI AUG 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BURLINGTON...
NORTHEASTERN NEW CASTLE...SOUTHEASTERN BUCKS...SOUTHEASTERN
MONTGOMERY...PHILADELPHIA...DELAWARE...SOUTH CENTRAL MERCER...
NORTHWESTERN GLOUCESTER...NORTHWESTERN CAMDEN AND SALEM COUNTIES IS
CANCELLED...

THUNDERSTORMS HAVE WEAKENED BELOW SEVERE LIMITS.

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 3976 7503 3946 7539 3944 7543 3948 7555
      3950 7557 3952 7554 3959 7554 3959 7556
      3958 7556 3954 7555 3949 7559 3953 7565
      3984 7553 4025 7511 4022 7464
TIME...MOT...LOC 2319Z 127DEG 27KT 4022 7524 3993 7561
          3966 7566

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:11 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	64 min
Aug 18, 8:26 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	112 min
Aug 18, 8:31 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	59 min
Aug 18, 8:48 PM EDT	Special Weather Statement	PHI	Warren	57 min
Aug 18, 8:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	57 min
Aug 18, 8:59 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	61 min
Aug 18, 9:48 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	57 min
Aug 18, 9:53 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Salem	67 min
Aug 18, 9:57 PM EDT	Severe Thunderstorm Warning	PHI	Morris	43 min
Aug 19, 12:19 AM EDT	Special Marine Warning	PHI		26 min
Aug 19, 12:19 AM EDT	Special Weather Statement	PHI	Cape May	41 min
Aug 19, 12:50 AM EDT	Special Weather Statement	PHI	Cumberland, Salem	40 min
Aug 19, 1:14 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 1 more	3 hr
Aug 19, 1:31 AM EDT	Special Weather Statement	PHI	Cumberland, Gloucester, Salem	59 min
Aug 19, 2:28 AM EDT	Special Weather Statement	PHI	Camden, Cumberland, Gloucester, Salem	47 min
Aug 19, 2:48 AM EDT	Special Weather Statement	PHI	Monmouth, Ocean	57 min
Aug 19, 3:06 AM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	114 min
Aug 19, 3:21 AM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth, Ocean	114 min
Aug 19, 6:24 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex	36 min
Aug 19, 6:37 AM EDT	Special Weather Statement	PHI	Middlesex	23 min
Aug 19, 1:34 PM EDT	Special Marine Warning	PHI		41 min
Aug 19, 2:39 PM EDT	Special Marine Warning	PHI		96 min
Aug 19, 3:23 PM EDT	Special Marine Warning	PHI		67 min
Aug 19, 4:05 PM EDT	Special Weather Statement	PHI	Camden	55 min
Aug 19, 4:15 PM EDT	Special Marine Warning	PHI		90 min
Aug 19, 4:29 PM EDT	Severe Thunderstorm Warning	PHI	Warren	61 min
Aug 19, 4:32 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	2 hr
Aug 19, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	67 min
Aug 19, 4:42 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	4 hr
Aug 19, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	78 min
Aug 19, 5:27 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	111 min
Aug 19, 5:29 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	50 min
Aug 19, 5:47 PM EDT	Special Marine Warning	PHI		118 min
Aug 19, 5:49 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	104 min
Aug 19, 5:59 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Morris, Somerset	80 min
Aug 19, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Morris	28 min
Aug 19, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	31 min
Aug 19, 1:44 AM EDT	Special Weather Statement	PHI	New Castle	61 min
Aug 19, 4:00 AM EDT	Areal Flood Warning	PHI	New Castle	4 hr
Aug 19, 1:20 PM EDT	Special Weather Statement	PHI	Kent, Sussex	85 min
Aug 19, 1:42 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	63 min
Aug 19, 2:09 PM EDT	Areal Flood Advisory	PHI	Sussex	92 min
Aug 19, 2:33 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	7 hr
Aug 19, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	52 min
Aug 19, 2:59 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	61 min
Aug 19, 3:13 PM EDT	Special Weather Statement	PHI	Sussex	92 min
Aug 19, 3:53 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	5 hr
Aug 19, 4:09 PM EDT	Severe Thunderstorm Warning	PHI	Kent	66 min
Aug 19, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	82 min
Aug 19, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	63 min
Aug 19, 6:34 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Aug 18, 8:08 PM EDT	Special Weather Statement	PHI	Berks	67 min
Aug 19, 12:02 AM EDT	Special Weather Statement	PHI	Chester	58 min
Aug 19, 1:46 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	59 min
Aug 19, 2:35 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	70 min
Aug 19, 2:38 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	3 hr
Aug 19, 2:57 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	3 hr
Aug 19, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	58 min
Aug 19, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	53 min
Aug 19, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Chester	55 min
Aug 19, 5:39 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	3 hr
Aug 19, 5:42 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	48 min
Aug 19, 5:45 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	3 hr
Aug 18, 8:35 PM EDT	Special Weather Statement	PHI	Queen Anne's	55 min
Aug 19, 1:00 AM EDT	Special Weather Statement	PHI	Cecil	45 min
Aug 19, 4:53 PM EDT	Areal Flood Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's	5 hr
Aug 19, 6:18 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr
Aug 19, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	69 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011 Severe Thunderstorm Warnings in Pennsylvania, 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; radar from the NEXRAD Level II archive.