Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 115, NWS Philadelphia/Mount Holly

July 1, 20095 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2009, 6:55 PM EDT for 5 counties in New Jersey. It was in force for 65 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
Jul 1, 2009, 6:55 PM EDT (22:55 UTC)
Expired
Jul 1, 2009, 8:00 PM EDT
In force
65 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

The radar

The Philadelphia radar (KDIX), 31 km from the middle of the area, began a volume at 22:58 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 1, 7:25 PM EDTHAIL 0.5Cream Ridge, NJDIME SIZE HAIL REPORTED IN CREAM RIDGE.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.9 hours before the alert went out and 155 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 2009-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 303 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 2009-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939587897Sfc1 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
303 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1065 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
131 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.

000 
WUUS51 KPHI 012255
SVRPHI
NJC005-021-023-025-029-020000-
/O.NEW.KPHI.SV.W.0115.090701T2255Z-090702T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
655 PM EDT WED JUL 1 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOUTHWESTERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  SOUTHERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  NORTH CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 800 PM EDT

* AT 655 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 NEAR
  WRIGHTSTOWN...OR 16 MILES SOUTHEAST OF TRENTON...AND MOVING NORTH
  AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GEORGETOWN AROUND 705 PM EDT...
  CREAM RIDGE AND CROSSWICKS AROUND 725 PM EDT...
  ALLENTOWN AROUND 730 PM EDT...
  IMLAYSTOWN AROUND 735 PM EDT...
  WINDSOR AND ROOSEVELT AROUND 745 PM EDT...
  EDINBURG AROUND 750 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4035 7461 4036 7432 3996 7452 4000 7472
TIME...MOT...LOC 2256Z 195DEG 15KT 4003 7461

$$

 
TFG
1 follow-up statement
000 
WWUS51 KPHI 012332
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
732 PM EDT WED JUL 1 2009

NJC005-021-023-025-029-020000-
/O.CON.KPHI.SV.W.0115.000000T0000Z-090702T0000Z/
MERCER NJ-MIDDLESEX NJ-MONMOUTH NJ-OCEAN NJ-BURLINGTON NJ-
732 PM EDT WED JUL 1 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTH CENTRAL BURLINGTON...NORTHWESTERN OCEAN...SOUTHWESTERN
MONMOUTH...SOUTHERN MIDDLESEX AND SOUTHEASTERN MERCER COUNTIES...

AT 730 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR ALLENTOWN...OR 9 MILES SOUTHEAST OF TRENTON...MOVING 
NORTH AT 15 MPH. DIME SIZE HAIL WAS REPORTED WITH THIS STORM IN
CREAM RIDGE. ANOTHER SEVERE STORM WAS OVER MANSFIELD TOWNSHIP IN 
BURLINGTON COUNTY.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  8 MILES WEST OF ROOSEVELT BY 740 PM EDT...
  WINDSOR BY 750 PM EDT...
  EDINBURG...HIGHTSTOWN AND 7 MILES WEST OF TWIN RIVERS BY 755 PM
  EDT...
  9 MILES WEST OF CLEARBROOK PARK AND 9 MILES SOUTHWEST OF ROSSMOOR
  BY 800 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 4035 7461 4036 7432 3996 7452 4000 7472
TIME...MOT...LOC 2331Z 174DEG 14KT 4017 7462

$$
 
TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 10:17 AM EDTSpecial Marine WarningPHI58 min
Jul 1, 10:34 AM EDTSpecial Marine WarningPHI56 min
Jul 1, 1:26 PM EDTSpecial Marine WarningPHI2 hr
Jul 1, 7:05 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer55 min
Jul 1, 7:38 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean67 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.