Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 3, NWS Philadelphia/Mount Holly

February 25, 20115 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 25, 2011, 1:16 PM EST for 5 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania. It was in force for 59 min. 1 report 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: Feb 25, 2011, 1:16 PM EST (18:16 UTC)
Expired: Feb 25, 2011, 2:15 PM EST
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 18:17 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
Feb 25, 2:00 PM EST	TSTM WND DMG	Lakewood, NJ	SMASHED WINDOWS... SHINGLES OFF ROOFS... GARBAGE CANS TOSSED... MICROBURST SIGNATURE ON RADAR... 1000 FT ESTIMATED WINDS 75 MPH.

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
Feb 25, 12:19 PM EST	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.3 hours before the alert went out and 125 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 446 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 464 m²/s²
0-3 km storm-relative helicity: 723 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.

834 
WUUS51 KPHI 251816
SVRPHI
NJC005-021-023-025-029-PAC017-101-251915-
/O.NEW.KPHI.SV.W.0003.110225T1816Z-110225T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
116 PM EST FRI FEB 25 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF SANDY HOOK...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...PERTH AMBOY...NEW BRUNSWICK...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  EXTREME EAST CENTRAL PHILADELPHIA COUNTY IN SOUTHEAST
  PENNSYLVANIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 215 PM EST

* AT 109 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 7 MILES NORTH OF CARTERET TO DAYTON TO EDINBURG TO BEVERLY...
  OR ALONG A LINE EXTENDING FROM ELIZABETH TO 7 MILES SOUTH OF NEW
  BRUNSWICK TO 7 MILES NORTHEAST OF TRENTON TO 9 MILES EAST OF
  PHILADELPHIA...AND MOVING EAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WINDSOR...CROSSWICKS...OLD BRIDGE AND HIGHTSTOWN AROUND 120 PM
  EST...
  MORGANVILLE...JACKSONVILLE...TWIN RIVERS AND ROBERTSVILLE AROUND
  125 PM EST...
  MIDDLETOWN AND MANALAPAN AROUND 130 PM EST...

AT 110 PM...A TRAINED SPOTTER IN HIGHLAND PARK IN MIDDLESEX COUNTY 
ESTIMATED WIND GUSTS OF 50 TO 60 MPH ALONG WITH PEA SIZE HAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF HEAVY SHOWERS AND THUNDERSTORMS MAY CONTAIN LITTLE OR 
NO LIGHTNING. DO NOT WAIT FOR THUNDER BEFORE TAKING COVER. SEEK 
SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 4008 7402 4004 7500 4030 7473 4038 7454
      4060 7432 4059 7429 4060 7423 4059 7420
      4055 7424 4047 7426 4044 7420 4046 7412
      4042 7399 4047 7401 4047 7399 4046 7398
      4041 7396 4032 7396
TIME...MOT...LOC 1814Z 273DEG 45KT 4068 7411 4038 7440
          4029 7459 4004 7491

$$

GORSE

1 follow-up statement

761 
WWUS51 KPHI 251841
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
141 PM EST FRI FEB 25 2011

PAC017-101-251849-
/O.CAN.KPHI.SV.W.0003.000000T0000Z-110225T1915Z/
PHILADELPHIA PA-BUCKS PA-
141 PM EST FRI FEB 25 2011

...THE SEVERE THUNDERSTORM WARNING FOR BUCKS AND PHILADELPHIA
COUNTIES IS CANCELLED...

THE LINE OF HEAVY SHOWERS AND SEVERE THUNDERSTORMS HAVE SHIFTED EAST 
OF THE AREA, THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

LAT...LON 4008 7402 4005 7472 4017 7460 4047 7426
      4044 7420 4046 7412 4042 7399 4047 7401
      4047 7399 4046 7398 4041 7396 4032 7396
TIME...MOT...LOC 1839Z 273DEG 45KT 4067 7373 4037 7403
          4028 7428 4004 7454

$$

NJC005-021-023-025-029-251915-
/O.CON.KPHI.SV.W.0003.000000T0000Z-110225T1915Z/
MERCER NJ-MIDDLESEX NJ-MONMOUTH NJ-OCEAN NJ-BURLINGTON NJ-
141 PM EST FRI FEB 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EST
FOR NORTH CENTRAL BURLINGTON...NORTHERN OCEAN...MONMOUTH...
SOUTHEASTERN MIDDLESEX AND SOUTHEASTERN MERCER COUNTIES...

AT 138 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 18 MILES NORTHEAST OF SANDY HOOK TO MIDDLETOWN TO
ENGLISHTOWN TO GEORGETOWN...OR ALONG A LINE EXTENDING FROM 7 MILES
EAST OF BROOKLYN TO 8 MILES SOUTHWEST OF SANDY HOOK TO 14 MILES SOUTH
OF NEW BRUNSWICK TO 14 MILES SOUTHEAST OF TRENTON...MOVING EAST AT 50
MPH.

THE DAMAGING WINDS CAN OCCUR ANYWHERE ALONG THIS LINE AS IT RACES 
ACROSS THE AREA.

SEVERE THUNDERSTORMS WILL BE NEAR...
  JACKSONS MILLS...CASSVILLE...ADELPHIA AND SHREWSBURY BY 145 PM
  EST...
  JACKSON...HOWELL...FREEWOOD ACRES AND COLLINGWOOD PARK BY 150 PM
  EST...
  ELBERON AND WANAMASSA BY 155 PM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF HEAVY SHOWERS AND THUNDERSTORMS MAY CONTAIN LITTLE OR 
NO LIGHTNING. DO NOT WAIT FOR THUNDER BEFORE TAKING COVER. SEEK 
SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 4008 7402 4005 7472 4017 7460 4047 7426
      4044 7420 4046 7412 4042 7399 4047 7401
      4047 7399 4046 7398 4041 7396 4032 7396
TIME...MOT...LOC 1839Z 273DEG 45KT 4067 7373 4037 7403
          4028 7428 4004 7454

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 25, 4:56 AM EST	Freezing Rain Advisory	PHI	Sussex	5 hr
Feb 25, 7:53 AM EST	Special Weather Statement	PHI	Atlantic, Cape May, Cumberland	82 min
Feb 25, 9:15 AM EST	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more	90 min
Feb 25, 12:44 PM EST	Special Weather Statement	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Salem and 1 more	61 min
Feb 25, 1:04 PM EST	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Feb 25, 1:11 PM EST	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	64 min
Feb 25, 1:23 PM EST	Special Marine Warning	PHI		67 min
Feb 25, 1:25 PM EST	Special Marine Warning	PHI		65 min
Feb 25, 1:48 PM EST	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more	57 min
Feb 25, 1:57 PM EST	Special Marine Warning	PHI		63 min
Feb 25, 2:09 PM EST	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	51 min
Feb 25, 2:16 PM EST	Special Marine Warning	PHI		89 min
Feb 25, 3:39 PM EST	Special Marine Warning	PHI		41 min
Feb 25, 12:11 PM EST	Special Weather Statement	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	64 min

Nearby

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