Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 225, NWS Philadelphia/Mount Holly

September 11, 2009Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 11, 2009, 2:48 AM EDT for Cape May County, New Jersey. It was in force for 72 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: Sep 11, 2009, 2:48 AM EDT (06:48 UTC)
Expired: Sep 11, 2009, 4:00 AM EDT
In force: 72 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Cape May County, NJ

The radar

The Dover AFB radar (KDOX), 59 km from the middle of the area, began a volume at 06:51 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 6.8 hours before the alert went out and 136 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 187 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 110648
SVRPHI
NJC009-110800-
/O.NEW.KPHI.SV.W.0225.090911T0648Z-090911T0800Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
248 AM EDT FRI SEP 11 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAPE MAY COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAPE MAY...

* UNTIL 400 AM EDT

* AT 244 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 18 MILES SOUTHEAST OF
  STONE HARBOR...OR 22 MILES EAST OF CAPE MAY...AND MOVING WEST AT 25
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  STONE HARBOR AROUND 325 AM EDT...
  WILDWOOD...WILDWOOD CREST AND NORTH WILDWOOD AROUND 330 AM EDT...
  WILDWOOD CREST AROUND 335 AM EDT...
  RIO GRANDE AND CAPE MAY AROUND 340 AM EDT...
  GREEN CREEK AND NORTH CAPE MAY AROUND 345 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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 3899 7498 3911 7490 3915 7490 3917 7492
      3924 7485 3916 7467 3915 7467 3912 7470
      3907 7471 3902 7479 3900 7478 3898 7480
      3893 7488 3892 7497
TIME...MOT...LOC 0648Z 111DEG 21KT 3889 7452

$$

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 2:20 AM EDT	Special Marine Warning	PHI		85 min
Sep 11, 3:06 AM EDT	Flash Flood Warning	PHI	Cape May	4 hr
Sep 11, 3:07 AM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 2 more	12 hr
Sep 11, 3:25 AM EDT	Special Marine Warning	PHI		95 min
Sep 11, 3:44 AM EDT	Special Marine Warning	PHI		95 min
Sep 11, 3:55 AM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	65 min
Sep 11, 4:55 AM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	65 min
Sep 11, 5:05 AM EDT	Special Marine Warning	PHI		115 min
Sep 11, 5:17 AM EDT	Special Marine Warning	PHI		88 min
Sep 11, 5:36 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	69 min
Sep 11, 5:52 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	53 min
Sep 11, 6:12 AM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	2 hr
Sep 11, 6:39 AM EDT	Special Marine Warning	PHI		96 min
Sep 11, 6:49 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	86 min
Sep 11, 6:59 AM EDT	Flash Flood Warning	PHI	Cape May	3 hr
Sep 11, 8:18 AM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	117 min
Sep 11, 8:31 AM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	119 min
Sep 11, 8:46 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth	39 min
Sep 11, 8:58 AM EDT	Coastal Flood Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	35 hr
Sep 11, 9:02 AM EDT	Wind Advisory	PHI	Monmouth, Ocean	3 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.