Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 106, NWS Philadelphia/Mount Holly

June 26, 2009Bucks County, Montgomery County, Philadelphia County, Pennsylvania; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 26, 2009, 7:28 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania; 4 counties in New Jersey. It was in force for 92 min. 3 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: Jun 26, 2009, 7:28 PM EDT (23:28 UTC)
Expired: Jun 26, 2009, 9:00 PM EDT
In force: 92 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Burlington County, NJ, Mercer County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 12 km from the middle of the area, began a volume at 23:30 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, 7:58 PM EDT	HAIL 0.75	4 N Mount Laurel, NJ	PENNY SIZE HAIL IN MOORESTOWN.
Jun 26, 7:58 PM EDT	HAIL 0.88	5 Sse Andalusia, NJ	NICKEL SIZE HAIL IN DELRAN TWP.
Jun 26, 8:18 PM EDT	HAIL 0.75	Toms River, NJ	3/4 INCH HAIL IN TOMS RIVER.

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, 11.5 hours before the alert went out and 151 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 262328
SVRPHI
NJC005-021-025-029-PAC017-091-101-270100-
/O.NEW.KPHI.SV.W.0106.090626T2328Z-090627T0100Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  SOUTHWESTERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  EXTREME SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  OCEAN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF TOMS RIVER...

* UNTIL 900 PM EDT

* AT 727 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM MERCERVILLE-HAMILTON SQUARE TO
  BEVERLY...OR ALONG A LINE EXTENDING FROM TRENTON TO 13 MILES EAST
  OF PHILADELPHIA...AND MOVING SOUTHEAST AT 35 MPH.

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 3992 7406 3981 7407 3974 7409 3958 7421
      3960 7425 3962 7421 3963 7423 3963 7424
      3961 7426 3992 7500 3998 7503 3997 7511
      4001 7520 4035 7475 4000 7404 3996 7404
TIME...MOT...LOC 2327Z 303DEG 31KT 4023 7471 4005 7490

$$

MPD

1 follow-up statement

000 
WWUS51 KPHI 270017
SVSPHI

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

NJC021-PAC017-091-101-270026-
/O.CAN.KPHI.SV.W.0106.000000T0000Z-090627T0100Z/
MERCER NJ-PHILADELPHIA PA-MONTGOMERY PA-BUCKS PA-
817 PM EDT FRI JUN 26 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUCKS...EXTREME
SOUTHEASTERN MONTGOMERY...NORTHEASTERN PHILADELPHIA AND MERCER
COUNTIES IS CANCELLED...

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

LAT...LON 3992 7406 3981 7407 3974 7409 3958 7421
      3960 7425 3962 7421 3963 7423 3961 7426
      3972 7453 3992 7498 3998 7503 4007 7470
      4015 7434 4000 7404 3996 7404
TIME...MOT...LOC 0016Z 301DEG 22KT 4004 7414 3990 7476

$$

NJC005-025-029-270100-
/O.CON.KPHI.SV.W.0106.000000T0000Z-090627T0100Z/
MONMOUTH NJ-OCEAN NJ-BURLINGTON NJ-
817 PM EDT FRI JUN 26 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHERN BURLINGTON...OCEAN AND EXTREME SOUTHWESTERN MONMOUTH
COUNTIES...

AT 814 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY
SIZE HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
AROUND LEISURE VILLAGE EAST TO AROUND MARLTON...MOVING
SOUTHEAST AT 25 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. 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 SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3992 7406 3981 7407 3974 7409 3958 7421
      3960 7425 3962 7421 3963 7423 3961 7426
      3972 7453 3992 7498 3998 7503 4007 7470
      4015 7434 4000 7404 3996 7404
TIME...MOT...LOC 0016Z 301DEG 22KT 4004 7414 3990 7476

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 4:51 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	69 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, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	41 min
Jun 26, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	48 min
Jun 26, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	50 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
Jun 26, 7:45 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	65 min
Jun 26, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	86 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, 6:45 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	30 min
Jun 26, 7:18 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean	72 min
Jun 26, 7:56 PM EDT	Special Marine Warning	PHI		64 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.