Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 227, NWS Philadelphia/Mount Holly

September 11, 2009Cape May County, Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 11, 2009, 4:55 AM EDT for Cape May County, Cumberland County, New Jersey. It was in force for 65 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, 4:55 AM EDT (08:55 UTC)
Expired: Sep 11, 2009, 6:00 AM EDT
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Cape May County, NJ, Cumberland County, NJ

The radar

The Dover AFB radar (KDOX), 52 km from the middle of the area, began a volume at 08:55 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 11, 4:12 AM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 8.9 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 110855
SVRPHI
NJC009-011-111000-
/O.NEW.KPHI.SV.W.0227.090911T0855Z-090911T1000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
455 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...
  SOUTHEASTERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 600 AM EDT

* AT 453 AM 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 GREEN CREEK...OR 9 MILES
  NORTH OF CAPE MAY...AND MOVING WEST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GREEN CREEK AND 7 MILES NORTH OF NORTH CAPE MAY AROUND 500 AM
  EDT...
  9 MILES SOUTH OF ELDORA AROUND 510 AM EDT...
  8 MILES SOUTH OF BIVALVE AROUND 535 AM EDT...
  9 MILES SOUTH OF PORT NORRIS AROUND 540 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON EDT FRIDAY FOR DELAWARE
AND NEW JERSEY.

&&

LAT...LON 3899 7498 3909 7491 3915 7490 3918 7497
      3918 7503 3920 7505 3920 7510 3917 7513
      3920 7519 3924 7518 3939 7500 3919 7465
      3907 7471 3902 7479 3899 7479 3894 7486
      3892 7495 3892 7497
TIME...MOT...LOC 0855Z 110DEG 15KT 3906 7488

$$

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, 2:48 AM EDT	Severe Thunderstorm Warning	PHI	Cape May	72 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, 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.