Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 199, NWS Philadelphia/Mount Holly

August 12, 2009Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2009, 1:26 PM EDT for Ocean County, New Jersey. It was in force for 22 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 12, 2009, 1:26 PM EDT (17:26 UTC)
Expired: Aug 12, 2009, 1:48 PM EDT
In force: 22 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 8 km from the middle of the area, began a volume at 17:27 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 12:00Z, 5.4 hours before the alert went out and 158 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: 286 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 974 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 121726
SVRPHI
NJC029-121815-
/O.NEW.KPHI.SV.W.0199.090812T1726Z-090812T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
126 PM EDT WED AUG 12 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 215 PM EDT

* AT 123 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR WOODRUFF...OR 15 MILES WEST
  OF TOMS RIVER...AND MOVING NORTH AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WOODRUFF AROUND 135 PM EDT...
  7 MILES WEST OF JACKSON AROUND 150 PM EDT...
  CASSVILLE AROUND 155 PM EDT...
  6 MILES WEST OF JACKSONS MILLS AROUND 210 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

&&

LAT...LON 3992 7419 3988 7445 4008 7455 4011 7449
      4015 7430
TIME...MOT...LOC 1726Z 184DEG 10KT 4003 7444

$$

JJM

1 follow-up statement

000 
WWUS51 KPHI 121748
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
148 PM EDT WED AUG 12 2009

NJC029-121756-
/O.CAN.KPHI.SV.W.0199.000000T0000Z-090812T1815Z/
OCEAN NJ-
148 PM EDT WED AUG 12 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OCEAN COUNTY IS
CANCELLED...

STORMS CONTINUE OVER PORTIONS OF OCEAN COUNTY EARLY THIS AFTERNOON. 
HOWEVER, DOPPLER RADAR INDICATES NONE OF THEM ARE CURRENTLY SEVERE. 
THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3992 7419 3988 7445 4008 7455 4011 7449
      4015 7430
TIME...MOT...LOC 1746Z 184DEG 10KT 4009 7443

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 12:04 PM EDT	Areal Flood Advisory	PHI	Mercer	60 min
Aug 12, 12:47 PM EDT	Flash Flood Warning	PHI	Mercer	3 hr
Aug 12, 2:55 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	50 min
Aug 12, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland	59 min
Aug 12, 3:17 PM EDT	Flash Flood Warning	PHI	Atlantic, Cumberland	4 hr
Aug 12, 3:29 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	60 min
Aug 12, 3:32 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	118 min
Aug 12, 4:01 PM EDT	Flash Flood Warning	PHI	Atlantic, Cape May	3 hr
Aug 12, 4:16 PM EDT	Flash Flood Warning	PHI	Cumberland, Salem	6 hr
Aug 12, 4:55 PM EDT	Flash Flood Warning	PHI	Salem	3 hr
Aug 12, 5:13 PM EDT	Areal Flood Advisory	PHI	Cape May, Cumberland	2 hr
Aug 12, 6:03 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009 Every 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.