Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 169, NWS Philadelphia/Mount Holly

July 31, 2009Atlantic County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 31, 2009, 5:15 PM EDT for Atlantic County, Ocean County, New Jersey. It was in force for 60 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
Jul 31, 2009, 5:15 PM EDT (21:15 UTC)
Expired
Jul 31, 2009, 6:15 PM EDT
In force
60 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Atlantic County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 21 km from the middle of the area, began a volume at 21:15 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

TimeReportWhereRemark
Jul 31, 5:55 PM EDTTSTM WND GST 51Toms River, NJ51 MPH GUST MEASURED AT THE TOMS RIVER AIRPORT.
Jul 31, 6:00 PM EDTTSTM WND DMGBeachwood, NJNUMEROUS TREES AND WIRES REPORTED DOWN. ALSO, TREES REPORTED DOWN HOMES IN BAYVILLE AND TOMS RIVER..
Jul 31, 6:03 PM EDTTSTM WND GST 50Barnegat Light, NJ50 MPH GUST MEASURED SOUTH OF THE ROUTE 72 BRIDGE IN BARNEGAT BAY.
Jul 31, 6:10 PM EDTTSTM WND GST 59Brick Township, NJ59 MPH GUST MEASURED IN BRICK TOWNSHIP.

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.

IssuedProductOfficeLasted
Jul 31, 1:18 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.3 hours before the alert went out and 168 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2009-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2009-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
48 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1022 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 312115
SVRPHI
NJC001-029-312215-
/O.NEW.KPHI.SV.W.0169.090731T2115Z-090731T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
515 PM EDT FRI JUL 31 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME EAST CENTRAL ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  OCEAN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF TOMS RIVER...

* UNTIL 615 PM EDT

* AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 13 MILES WEST OF WOODRUFF
  TO 17 MILES SOUTHWEST OF OLD HALFWAY TO 28 MILES WEST OF
  BRIGANTINE...OR ALONG A LINE EXTENDING FROM 14 MILES SOUTH OF
  TRENTON TO 23 MILES NORTHEAST OF VINELAND TO VINELAND...AND MOVING
  EAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WOODRUFF AND OLD HALFWAY AROUND 530 PM EDT...
  WHITING...WARREN GROVE AND CEDAR GLEN LAKES AROUND 535 PM EDT...
  JACKSON...BROOKVILLE...BAMBER LAKE AND LAKEHURST AROUND 540 PM
  EDT...
  TUCKERTON AROUND 545 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...


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

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

&&

LAT...LON 3971 7411 3952 7427 3953 7427 3959 7426
      3959 7430 3957 7431 3951 7428 3949 7432
      3953 7433 3953 7442 3977 7438 4007 7456
      4012 7448 4012 7426 4010 7424 4010 7416
      4013 7410 4009 7408 4009 7402
TIME...MOT...LOC 2115Z 271DEG 38KT 4003 7466 3972 7467
          3943 7486

$$

AMC
2 follow-up statements
000 
WWUS51 KPHI 312152
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
552 PM EDT FRI JUL 31 2009

NJC001-029-312215-
/O.CON.KPHI.SV.W.0169.000000T0000Z-090731T2215Z/
OCEAN NJ-ATLANTIC NJ-
552 PM EDT FRI JUL 31 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR EXTREME EAST CENTRAL ATLANTIC AND OCEAN COUNTIES...

AT 550 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS
LOCATED NEAR BAMBER LAKE...OR 7 MILES SOUTHWEST OF TOMS RIVER...
MOVING EAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  FORKED RIVER...OCEAN GATE...SEASIDE PARK AND SEASIDE HEIGHTS BY 600
  PM EDT...
  7 MILES SOUTH OF LAVALLETTE BY 605 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.

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

&&

LAT...LON 3971 7411 3952 7427 3953 7427 3959 7426
      3959 7430 3957 7431 3951 7428 3949 7432
      3953 7433 3953 7442 3977 7438 4007 7456
      4012 7448 4012 7426 4010 7424 4010 7416
      4013 7410 4009 7408 4009 7402
TIME...MOT...LOC 2152Z 271DEG 38KT 3987 7422

$$

AMC
000 
WWUS51 KPHI 312220
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
620 PM EDT FRI JUL 31 2009

NJC001-029-312228-
/O.EXP.KPHI.SV.W.0169.000000T0000Z-090731T2215Z/
OCEAN NJ-ATLANTIC NJ-
620 PM EDT FRI JUL 31 2009

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL ATLANTIC
AND OCEAN COUNTIES HAS EXPIRED...

THE THUNDERSTORMS WHICH PROMPTED THE WARNINGS ARE NOW MOVING OFF 
SHORE AND THE THREAT OF SEVERE WEATHER WILL RAPIDLY DIMINISH.

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

LAT...LON 3971 7411 3952 7427 3953 7427 3959 7426
      3959 7430 3957 7431 3951 7428 3949 7432
      3953 7433 3953 7442 3977 7438 4007 7456
      4012 7448 4012 7426 4010 7424 4010 7416
      4013 7410 4009 7408 4009 7402
TIME...MOT...LOC 2152Z 271DEG 38KT 3987 7422

$$

AMC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 2:13 PM EDTFlash Flood WarningPHISussex4 hr
Jul 31, 2:36 PM EDTFlash Flood WarningPHIHunterdon, Morris, Sussex, Warren4 hr
Jul 31, 4:03 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem57 min
Jul 31, 4:08 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester, Salem3 hr
Jul 31, 4:23 PM EDTSpecial Marine WarningPHI67 min
Jul 31, 4:31 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester, Salem59 min
Jul 31, 4:39 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more96 min
Jul 31, 4:56 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset114 min
Jul 31, 5:07 PM EDTFlash Flood WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem3 hr
Jul 31, 5:10 PM EDTTornado WarningPHIBurlington, Ocean21 min
Jul 31, 5:14 PM EDTSpecial Marine WarningPHI2 hr
Jul 31, 5:16 PM EDTSpecial Marine WarningPHI119 min
Jul 31, 5:31 PM EDTFlash Flood WarningPHIBurlington, Monmouth, Ocean4 hr
Jul 31, 5:48 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Cumberland, Ocean3 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009Every severe thunderstorm warning in 2009

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.