Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 222, NWS Philadelphia/Mount Holly

August 28, 2009Atlantic County, Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 28, 2009, 7:55 AM EDT for Atlantic County, Cape May County, New Jersey. It was in force for 70 min. 2 reports 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: Aug 28, 2009, 7:55 AM EDT (11:55 UTC)
Expired: Aug 28, 2009, 9:05 AM EDT
In force: 70 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Atlantic County, NJ, Cape May County, NJ

The radar

The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 11:59 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

Time	Report	Where	Remark
Aug 28, 7:55 AM EDT	HAIL 0.5	2 N Woodbine, NJ	DIME SIZE HAIL IN STEELMANTOWN.
Aug 28, 8:30 AM EDT	HAIL 0.5	2 N Woodbine, NJ	DIME SIZE HAIL IN STEELMANTOWN.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 11.9 hours before the alert went out and 161 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: 1598 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 776 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 281155
SVRPHI
NJC001-009-281315-
/O.NEW.KPHI.SV.W.0222.090828T1155Z-090828T1315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
755 AM EDT FRI AUG 28 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN CAPE MAY COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 915 AM EDT

* AT 754 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED NEAR WOODBINE...OR 18
  MILES SOUTHEAST OF MILLVILLE...AND MOVING EAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SEAVILLE AROUND 825 AM EDT...
  MARMORA AND SEA ISLE CITY AROUND 835 AM EDT...
  OCEAN CITY AROUND 850 AM EDT...

STRONG WINDS AND LIGHTNING CAN BE EXPECTED FROM THIS STORM.

LAT...LON 3929 7452 3930 7454 3928 7455 3925 7459
      3920 7464 3906 7473 3910 7477 3910 7479
      3919 7492 3935 7485 3939 7470 3935 7453
      3934 7452 3934 7446
TIME...MOT...LOC 1155Z 287DEG 8KT 3925 7478

$$
JJM

1 follow-up statement

000 
WWUS51 KPHI 281305
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
905 AM EDT FRI AUG 28 2009

NJC001-009-281315-
/O.CAN.KPHI.SV.W.0222.000000T0000Z-090828T1315Z/
CAPE MAY NJ-ATLANTIC NJ-
905 AM EDT FRI AUG 28 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ATLANTIC AND
NORTHERN CAPE MAY COUNTIES IS CANCELLED...

THE STRONGEST THUNDERSTORMS HAVE NOW MOVED JUST OFF THE COAST. THE 
SEVERE THUNDERSTORM WARNING FOR ATLANTIC AND CAPE MAY COUNTIES HAS 
THEREFORE BEEN CANCELLED.

LAT...LON 3929 7452 3930 7454 3928 7455 3925 7459
      3920 7464 3906 7473 3910 7477 3910 7479
      3919 7492 3935 7485 3939 7470 3935 7453
      3934 7452 3934 7446
TIME...MOT...LOC 1305Z 287DEG 8KT 3920 7459

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 5:56 AM EDT	Areal Flood Advisory	PHI	Cumberland	109 min
Aug 28, 8:25 AM EDT	Special Marine Warning	PHI		95 min
Aug 28, 9:32 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset and 1 more	3 hr
Aug 28, 9:34 AM EDT	Special Marine Warning	PHI		116 min
Aug 28, 9:59 AM EDT	Special Marine Warning	PHI		61 min
Aug 28, 11:34 AM EDT	Special Marine Warning	PHI		56 min
Aug 28, 11:53 AM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	43 min
Aug 28, 12:04 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May	3 hr
Aug 28, 2:52 PM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 6 more	14 hr
Aug 28, 3:13 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	4 hr
Aug 28, 4:52 PM EDT	Special Marine Warning	PHI		53 min
Aug 28, 5:16 PM EDT	Areal Flood Advisory	PHI	Cape May, Cumberland	6 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.