Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 66, NWS Philadelphia/Mount Holly

May 23, 2011Northampton County, Pennsylvania; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 23, 2011, 8:31 PM EDT for Northampton County, Pennsylvania; 5 counties in New Jersey. 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: May 23, 2011, 8:31 PM EDT (00:31 UTC)
Expired: May 23, 2011, 9:30 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 94 km from the middle of the area, began a volume at 00:32 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
May 23, 8:55 PM EDT	TSTM WND DMG	Oxford Twp, NJ	TREES DOWN IN SOUTHEASTERN WARREN COUNTY... MAINLY IN WASHINGTON TWP.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.5 hours before the alert went out and 145 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: 115 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 457 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

355 
WUUS51 KPHI 240031
SVRPHI
NJC019-027-035-037-041-PAC095-240130-
/O.NEW.KPHI.SV.W.0066.110524T0031Z-110524T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
831 PM EDT MON MAY 23 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF MORRISTOWN...
  NORTHERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  NORTHERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  SOUTHERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  THIS INCLUDES THE CITY OF NEWTON...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 930 PM EDT

* AT 828 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 7 MILES WEST OF NEWTON TO OXFORD TO GLENDON...OR
  ALONG A LINE EXTENDING FROM 7 MILES WEST OF NEWTON TO 13 MILES
  NORTHEAST OF EASTON TO EASTON...AND MOVING EAST AT 35 MPH. A WIND
  GUST OF 68 MPH WAS JUST RECEIVED IN FORKS TOWNSHIP.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  NEWTON...HACKETTSTOWN...BLOOMSBURY AND ALLAMUCHY AROUND 840 PM
  EDT...
  HAMPTON AND ANDOVER AROUND 845 PM EDT...
  STANHOPE...NETCONG...LONG VALLEY AND LAKE MOHAWK AROUND 850 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.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 4089 7433 4086 7431 4078 7437 4074 7436
      4067 7445 4065 7445 4065 7439 4054 7456
      4060 7520 4062 7520 4061 7531 4078 7509
      4109 7484 4100 7429 4097 7427 4089 7427
TIME...MOT...LOC 0031Z 266DEG 30KT 4103 7485 4079 7496
          4063 7525

$$

TFG

1 follow-up statement

008 
WWUS51 KPHI 240111
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
911 PM EDT MON MAY 23 2011

PAC095-240120-
/O.CAN.KPHI.SV.W.0066.000000T0000Z-110524T0130Z/
NORTHAMPTON PA-
911 PM EDT MON MAY 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NORTHAMPTON
COUNTY IS CANCELLED...

THE SEVERE THUDNERSTORM IS IN NEW JERSEY.

LAT...LON 4089 7428 4089 7433 4086 7431 4078 7437
      4074 7436 4067 7445 4065 7445 4065 7442
      4063 7444 4068 7512 4083 7485 4095 7473
      4107 7471 4100 7429 4097 7427 4091 7427
TIME...MOT...LOC 0110Z 264DEG 30KT 4104 7462 4096 7461
          4084 7473 4073 7493

$$

NJC019-027-035-037-041-240130-
/O.CON.KPHI.SV.W.0066.000000T0000Z-110524T0130Z/
SUSSEX NJ-WARREN NJ-MORRIS NJ-HUNTERDON NJ-SOMERSET NJ-
911 PM EDT MON MAY 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR NORTHERN SOMERSET...NORTHEASTERN HUNTERDON...MORRIS...SOUTH
CENTRAL WARREN AND SOUTH CENTRAL SUSSEX COUNTIES...

AT 906 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS TO 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING 
FROM LAKE MOHAWK TO HOPATCONG TO BUDD LAKE TO HAMPTON...OR ALONG A 
LINE EXTENDING FROM NEWTON TO 8 MILES SOUTHEAST OF NEWTON TO 15 
MILES SOUTH OF NEWTON TO 13 MILES EAST OF EASTON...MOVING EAST AT 35 
MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SUCCASUNNA...LONG VALLEY AND HIGH BRIDGE BY 915 PM EDT...
  DOVER...GREEN POND...WHARTON AND LAKE TELEMARK BY 920 PM EDT...
  WHITE MEADOW LAKE...VICTORY GARDENS AND ROCKAWAY BY 925 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING HIGH WINDS AND HAIL. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4089 7428 4089 7433 4086 7431 4078 7437
      4074 7436 4067 7445 4065 7445 4065 7442
      4063 7444 4068 7512 4083 7485 4095 7473
      4107 7471 4100 7429 4097 7427 4091 7427
TIME...MOT...LOC 0110Z 264DEG 30KT 4104 7462 4096 7461
          4084 7473 4073 7493

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 8:22 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	53 min
May 23, 9:06 PM EDT	Areal Flood Advisory	PHI	Northampton	2 hr
May 23, 9:23 PM EDT	Special Weather Statement	PHI	Northampton	67 min
May 23, 9:25 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	65 min
May 23, 9:32 PM EDT	Special Weather Statement	PHI	Morris	88 min
May 23, 9:47 PM EDT	Special Marine Warning	PHI		88 min
May 23, 9:58 PM EDT	Special Weather Statement	PHI	Cape May	47 min
May 24, 4:02 PM EDT	Special Marine Warning	PHI		43 min
May 24, 4:20 PM EDT	Special Weather Statement	PHI	Camden	85 min
May 24, 4:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	50 min
May 24, 6:19 PM EDT	Special Weather Statement	PHI	Atlantic	86 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.