Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 108, NWS Philadelphia/Mount Holly

June 26, 20095 counties in New Jersey; Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 26, 2009, 7:45 PM EDT for 5 counties in New Jersey; Philadelphia County, Pennsylvania. It was in force for 65 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: Jun 26, 2009, 7:45 PM EDT (23:45 UTC)
Expired: Jun 26, 2009, 8:50 PM EDT
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Ocean County, NJ, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 36 km from the middle of the area, began a volume at 23:44 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
Jun 26, 7:46 PM EDT	HAIL 0.88	4 W Philadelphia, PA	NICKEL SIZE HAIL

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 26, 2:42 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.8 hours before the alert went out and 126 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: 1259 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 262345
SVRPHI
NJC001-005-007-015-029-PAC101-270115-
/O.NEW.KPHI.SV.W.0108.090626T2345Z-090627T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
745 PM EDT FRI JUN 26 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  NORTHEASTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF ATLANTIC CITY...
  SOUTHERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  NORTHEASTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SOUTH CENTRAL OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 915 PM EDT

* AT 741 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  ROXBOROUGH...OR 6 MILES WEST OF PHILADELPHIA...AND MOVING SOUTHEAST
  AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TEMPLE UNIVERSITY...CENTER CITY...KENSINGTON AND PHILADELPHIA
  AROUND 750 PM EDT...
  SOUTH PHILADELPHIA AROUND 755 PM EDT...
  CAMDEN AND GLOUCESTER CITY AROUND 800 PM EDT...
  BELLMAWR AND WOODBURY AROUND 805 PM EDT...
  MAGNOLIA AROUND 810 PM EDT...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3950 7428 3950 7433 3953 7434 3953 7440
      3949 7438 3949 7432 3945 7429 3935 7441
      3986 7525 3990 7527 3994 7525 3998 7528
      4001 7522 4005 7527 4008 7524 3964 7424
      3961 7425 3961 7418
TIME...MOT...LOC 2344Z 311DEG 27KT 3999 7523

$$

SZATKOWSKI

1 follow-up statement

000 
WWUS51 KPHI 270050
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
850 PM EDT FRI JUN 26 2009

NJC001-005-007-015-029-PAC101-270059-
/O.CAN.KPHI.SV.W.0108.000000T0000Z-090627T0115Z/
CAMDEN NJ-GLOUCESTER NJ-PHILADELPHIA PA-OCEAN NJ-ATLANTIC NJ-
BURLINGTON NJ-
850 PM EDT FRI JUN 26 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN BURLINGTON...
NORTHEASTERN ATLANTIC...SOUTH CENTRAL OCEAN...PHILADELPHIA...
NORTHEASTERN GLOUCESTER AND CAMDEN COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT 
FRIDAY EVENING FOR NEW JERSEY AND SOUTHEASTERN PENNSYLVANIA.

LAT...LON 3950 7428 3950 7433 3953 7434 3953 7440
      3949 7438 3949 7432 3945 7429 3935 7441
      3986 7525 3990 7527 3994 7525 3998 7528
      4001 7522 4005 7527 4008 7524 3964 7424
      3961 7425 3961 7418
TIME...MOT...LOC 0049Z 311DEG 27KT 3967 7476

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	86 min
Jun 26, 4:51 PM EDT	Severe Thunderstorm Warning	PHI	Warren	69 min
Jun 26, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	78 min
Jun 26, 6:39 PM EDT	Special Marine Warning	PHI		51 min
Jun 26, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	41 min
Jun 26, 6:45 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	30 min
Jun 26, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	50 min
Jun 26, 7:18 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean	72 min
Jun 26, 7:28 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	92 min
Jun 26, 7:56 PM EDT	Special Marine Warning	PHI		64 min
Jun 26, 3:31 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	59 min
Jun 26, 3:53 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	82 min
Jun 26, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Berks	55 min
Jun 26, 6:01 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	59 min
Jun 26, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh	59 min
Jun 26, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	52 min
Jun 26, 6:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks	45 min
Jun 26, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	48 min
Jun 26, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	60 min
Jun 26, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks	45 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009 Severe Thunderstorm Warnings in Pennsylvania, 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.