Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 255, NWS Philadelphia/Mount Holly

August 18, 20115 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 2011, 8:48 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 57 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: Aug 18, 2011, 8:48 PM EDT (00:48 UTC)
Expired: Aug 18, 2011, 9:45 PM EDT
In force: 57 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

The radar

The Philadelphia radar (KDIX), 25 km from the middle of the area, began a volume at 00:48 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, 0.8 hours before the alert went out and 172 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: 1443 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 871 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 155 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.

638 
WUUS51 KPHI 190048
SVRPHI
NJC005-021-023-025-029-PAC017-190145-
/O.NEW.KPHI.SV.W.0255.110819T0048Z-110819T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
848 PM EDT THU AUG 18 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...
  SOUTHWESTERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  SOUTHWESTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 945 PM EDT

* AT 844 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 LEVITTOWN TO LUMBERTON TO 12
  MILES SOUTHWEST OF LUMBERTON...OR ALONG A LINE EXTENDING FROM 7
  MILES SOUTHWEST OF TRENTON TO 15 MILES EAST OF CAMDEN TO 12 MILES
  SOUTHEAST OF CAMDEN...AND MOVING NORTHEAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LUMBERTON...JACKSONVILLE AND MOUNT HOLLY AROUND 855 PM EDT...
  TRENTON AND COLUMBUS AROUND 900 PM EDT...
  COLUMBUS...WHITE HORSE AND BORDENTOWN AROUND 905 PM EDT...
  JOBSTOWN AND MERCERVILLE-HAMILTON SQUARE AROUND 910 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 4027 7472 4047 7448 4016 7431 3995 7422
      3983 7464 3990 7468 3997 7473 3995 7481
      4020 7494
TIME...MOT...LOC 0048Z 233DEG 21KT 4015 7482 3998 7481
          3984 7491

$$

HEAVENER

2 follow-up statements

701 
WWUS51 KPHI 190125
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
925 PM EDT THU AUG 18 2011

NJC021-023-PAC017-190135-
/O.CAN.KPHI.SV.W.0255.000000T0000Z-110819T0145Z/
MERCER NJ-MIDDLESEX NJ-BUCKS PA-
925 PM EDT THU AUG 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUCKS...
SOUTHWESTERN MIDDLESEX AND MERCER COUNTIES IS CANCELLED...

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 3999 7449 3994 7463 4006 7477 4015 7463
      4013 7460 4016 7461 4028 7438 4026 7436
      4005 7426
TIME...MOT...LOC 0125Z 233DEG 21KT 4028 7459 4011 7458
          3997 7469

$$

NJC005-025-029-190145-
/O.CON.KPHI.SV.W.0255.000000T0000Z-110819T0145Z/
MONMOUTH NJ-OCEAN NJ-BURLINGTON NJ-
925 PM EDT THU AUG 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR NORTH CENTRAL BURLINGTON...NORTHWESTERN OCEAN AND SOUTHWESTERN
MONMOUTH COUNTIES...

AT 923 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE 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 8 MILES NORTHWEST OF
ROOSEVELT TO GEORGETOWN TO JOBSTOWN...OR ALONG A LINE EXTENDING FROM
9 MILES NORTHEAST OF TRENTON TO 12 MILES SOUTHEAST OF TRENTON TO 18
MILES SOUTH OF TRENTON...MOVING NORTHEAST AT 25 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WRIGHTSTOWN BY 930 PM EDT...
  IMLAYSTOWN...CREAM RIDGE...FORT DIX AND BROWNS MILLS BY 935 PM
  EDT...
  MCGUIRE AFB BY 940 PM EDT...
  NEW EGYPT...CLARKSBURG...SIX FLAGS THEME PARK AND MANALAPAN BY 945
  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 3999 7449 3994 7463 4006 7477 4015 7463
      4013 7460 4016 7461 4028 7438 4026 7436
      4005 7426
TIME...MOT...LOC 0125Z 233DEG 21KT 4028 7459 4011 7458
          3997 7469

$$

HEAVENER

480 
WWUS51 KPHI 190142
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
942 PM EDT THU AUG 18 2011

NJC005-025-029-190152-
/O.EXP.KPHI.SV.W.0255.000000T0000Z-110819T0145Z/
MONMOUTH NJ-OCEAN NJ-BURLINGTON NJ-
942 PM EDT THU AUG 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BURLINGTON...
NORTHWESTERN OCEAN AND SOUTHWESTERN MONMOUTH COUNTIES WILL EXPIRE AT
945 PM EDT...

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 3999 7449 3994 7463 4006 7477 4015 7463
      4013 7460 4016 7461 4028 7438 4026 7436
      4005 7426
TIME...MOT...LOC 0142Z 233DEG 21KT 4034 7448 4017 7448
          4003 7459

$$

HEAVENER

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, 8:59 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, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Salem	65 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 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, 4:00 AM EDT	Areal Flood Warning	PHI	Delaware	4 hr
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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.