Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 25, NWS Philadelphia/Mount Holly

May 9, 2009Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 9, 2009, 7:46 PM EDT for Cumberland County, New Jersey. It was in force for 33 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: May 9, 2009, 7:46 PM EDT (23:46 UTC)
Expired: May 9, 2009, 8:19 PM EDT
In force: 33 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Cumberland County, NJ

The radar

The Dover AFB radar (KDOX), 54 km from the middle of the area, began a volume at 23:49 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
May 9, 8:05 PM EDT	TSTM WND DMG	5 Ne Port Norris, NJ	TREES DOWN IN MAURICE RIVER TOWNSHIP.

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 12:00Z, 11.8 hours before the alert went out and 148 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: 288 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 650 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 092346
SVRPHI
NJC011-100030-
/O.NEW.KPHI.SV.W.0025.090509T2346Z-090510T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
746 PM EDT SAT MAY 9 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 830 PM EDT

* AT 746 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 6 MILES
  SOUTHWEST OF NEWPORT...OR 14 MILES NORTHEAST OF DOVER...AND MOVING
  EAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CEDARVILLE...PORT NORRIS...LAUREL LAKE...BIVALVE AND CUMBERLAND

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 NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

&&

LAT...LON 3917 7495 3918 7503 3920 7505 3917 7514
      3920 7519 3923 7518 3926 7524 3929 7527
      3928 7530 3929 7532 3933 7535 3938 7488
      3932 7488
TIME...MOT...LOC 2346Z 273DEG 37KT 3925 7527

$$

MPD

1 follow-up statement

000 
WWUS51 KPHI 100019
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
819 PM EDT SAT MAY 9 2009

NJC011-100029-
/O.CAN.KPHI.SV.W.0025.000000T0000Z-090510T0030Z/
CUMBERLAND NJ-
819 PM EDT SAT MAY 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CUMBERLAND COUNTY IS
CANCELLED...

AS OF 819 PM...THE THUNDERSTORM HAD MOVED EAST OF THE COUNTY. 

LAT...LON 3917 7495 3918 7503 3920 7505 3917 7514
      3920 7519 3923 7518 3926 7524 3929 7527
      3928 7530 3929 7532 3933 7535 3938 7488
      3932 7488
TIME...MOT...LOC 0017Z 273DEG 37KT 3923 7485

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 7:00 PM EDT	Special Marine Warning	PHI		60 min
May 9, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	22 min
May 9, 7:23 PM EDT	Special Marine Warning	PHI		67 min
May 9, 7:33 PM EDT	Special Marine Warning	PHI		27 min

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.