Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 69, NWS Philadelphia/Mount Holly

June 12, 2007Bucks County, Pennsylvania; Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 12, 2007, 4:08 PM EDT for Bucks County, Pennsylvania; Mercer County, New Jersey. It was in force for 37 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: Jun 12, 2007, 4:08 PM EDT (20:08 UTC)
Expired: Jun 12, 2007, 4:45 PM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Mercer County, NJ, Bucks County, PA

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 12, 12:55 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.1 hours before the alert went out and 143 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: 186 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1120 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 34 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 122008
SVRPHI
NJC021-PAC017-122045-
/O.NEW.KPHI.SV.W.0069.070612T2008Z-070612T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
408 PM EDT TUE JUN 12 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  EAST CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 445 PM EDT

* AT 407 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS NEAR 60 MPH.  THIS STORM WAS LOCATED OVER
  EXTREME NORTHWESTERN MERCER COUNTY...OR ABOUT 10 MILES NORTHWEST OF
  TRENTON...AND MOVING SOUTHWEST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL EASTERN BUCKS COUNTY AT 420 PM EDT

LAT...LON 4037 7477 4038 7483 4031 7501 4025 7490

$$

JRP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 12:56 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	64 min
Jun 12, 1:12 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh	26 min
Jun 12, 1:18 PM EDT	Severe Thunderstorm Warning	PHI	Berks	42 min
Jun 12, 2:00 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Northampton	30 min
Jun 12, 2:15 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	30 min
Jun 12, 2:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	35 min
Jun 12, 2:48 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	42 min
Jun 12, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	40 min
Jun 12, 4:00 PM EDT	Flash Flood Warning	PHI	Montgomery	3 hr
Jun 12, 5:46 PM EDT	Flash Flood Warning	PHI	Bucks	119 min
Jun 12, 1:08 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	67 min
Jun 12, 2:04 PM EDT	Special Marine Warning	PHI		41 min
Jun 12, 2:44 PM EDT	Special Marine Warning	PHI		46 min
Jun 12, 3:09 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester	25 min
Jun 12, 3:55 PM EDT	Special Marine Warning	PHI		35 min
Jun 12, 4:33 PM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Middlesex, Monmouth, Ocean	7 hr
Jun 12, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	54 min
Jun 12, 7:48 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	57 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2007 Severe Thunderstorm Warnings in New Jersey, 2007 Every severe thunderstorm warning in 2007

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.