Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Philadelphia/Mount Holly

May 7, 20095 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 7, 2009, 2:05 PM EDT for 5 counties in New Jersey. It was in force for 40 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
May 7, 2009, 2:05 PM EDT (18:05 UTC)
Expired
May 7, 2009, 2:45 PM EDT
In force
40 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Atlantic County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 71 km from the middle of the area, began a volume at 18:04 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.1 hours before the alert went out and 68 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, Phillips Aaf/Abe, MD at 12:00Z on 2009-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 38 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2009-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.19395878Sfc1 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
38 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
642 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
106 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.

000 
WUUS51 KPHI 071805
SVRPHI
NJC001-007-011-015-033-071915-
/O.NEW.KPHI.SV.W.0021.090507T1805Z-090507T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
205 PM EDT THU MAY 7 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  SOUTH CENTRAL CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...VINELAND...MILLVILLE...
  SOUTHEASTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHERN SALEM COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SALEM...

* UNTIL 315 PM EDT

* AT 205 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 10
  MILES SOUTHWEST OF SALEM...OR 9 MILES EAST OF MIDDLETOWN...AND
  MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SHILOH BY 235 PM EDT...
  SEABROOK FARMS AND BRIDGETON BY 240 PM EDT...
  OLIVET BY 245 PM EDT...
  ROSENHAYN AND OLIVET BY 250 PM EDT...
  SOUTH VINELAND BY 300 PM EDT...
  NEWFIELD AND VINELAND BY 305 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.

&&

LAT...LON 3935 7474 3936 7540 3937 7541 3939 7545
      3943 7548 3946 7555 3950 7557 3952 7554
      3955 7553 3973 7493
TIME...MOT...LOC 1805Z 261DEG 26KT 3945 7556

$$

 
TFG
1 follow-up statement
000 
WWUS51 KPHI 071845
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
245 PM EDT THU MAY 7 2009

NJC001-007-011-015-033-071854-
/O.CAN.KPHI.SV.W.0021.000000T0000Z-090507T1915Z/
SALEM NJ-CUMBERLAND NJ-CAMDEN NJ-GLOUCESTER NJ-ATLANTIC NJ-
245 PM EDT THU MAY 7 2009

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL ATLANTIC...
SOUTHEASTERN GLOUCESTER...SOUTH CENTRAL CAMDEN...NORTHERN CUMBERLAND
AND SOUTHERN SALEM COUNTIES IS CANCELLED...

THE THUNDERSTORM HAS WEAKENED AND NO LONGER APPEARS SEVERE.


LAT...LON 3935 7474 3936 7540 3937 7541 3939 7545
      3943 7548 3946 7555 3950 7557 3952 7554
      3955 7553 3973 7493
TIME...MOT...LOC 1844Z 261DEG 26KT 3949 7520

$$

TFG

The office that day

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

IssuedProductOfficeCountiesLasted
May 6, 9:01 PM EDTFlood WatchPHIHunterdon, Mercer, Middlesex, Monmouth, Somerset19 hr
May 7, 3:09 AM EDTAreal Flood AdvisoryPHIHunterdon, Morris2 hr
May 7, 1:22 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Salem4 hr
May 7, 1:42 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Somerset4 hr
May 7, 1:43 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Somerset62 min
May 7, 2:01 PM EDTSpecial Marine WarningPHI89 min
May 7, 2:34 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Mercer, Middlesex, Monmouth3 hr
May 7, 2:53 PM EDTSpecial Marine WarningPHI97 min
May 7, 4:05 PM EDTSpecial Marine WarningPHI67 min

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