Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 14, 2012Hunterdon County, Mercer County, New Jersey; Bucks County, Delaware County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 14, 2012, 9:44 AM EDT for Hunterdon County, Mercer County, New Jersey; Bucks County, Delaware County, Montgomery County, Pennsylvania. It was in force for 91 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: Aug 14, 2012, 9:44 AM EDT (13:44 UTC)
Expired: Aug 14, 2012, 11:15 AM EDT
In force: 91 min
Issued by: NWS Philadelphia/Mount Holly

Counties Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 68 km from the middle of the area, began a volume at 13:45 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.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 1.7 hours before the alert went out and 127 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: 1166 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 256 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

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

109 
WWUS81 KPHI 141344
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
944 AM EDT TUE AUG 14 2012

NJZ008>010-015-PAZ067>071-141515-
BUCKS PA-CHESTER PA-DELAWARE PA-HUNTERDON NJ-MERCER NJ-MONTGOMERY PA-
MORRIS NJ-PHILADELPHIA PA-SOMERSET NJ-
944 AM EDT TUE AUG 14 2012

...STRONG THUNDERSTORMS WILL AFFECT BUCKS...CHESTER...DELAWARE...
HUNTERDON...MERCER...MONTGOMERY...MORRIS...PHILADELPHIA AND SOMERSET
COUNTIES...

AT 941 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 17 MILES SOUTH OF
EASTON TO 16 MILES NORTHWEST OF PHILADELPHIA TO 10 MILES EAST OF WEST
CHESTER...MOVING NORTHEAST AT 35 MPH. THE THUNDERSTORMS WILL BE NEAR
FRENCHTOWN...MILFORD AROUND 1000 AM...LEBANON...ANNANDALE AROUND 1015
AM...CALIFON...BENSALEM AROUND 1030 AM...CHESTER...SKILLMAN AROUND
1045 AM AND LAWRENCEVILLE AROUND 1100 AM.

VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. DO
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 4021 7471 3984 7557 4014 7544 4049 7536
      4085 7461

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 9:22 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	38 min
Aug 14, 10:07 AM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	83 min
Aug 14, 11:42 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester	3 hr
Aug 14, 2:35 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	78 min
Aug 14, 3:46 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Ocean	2 hr
Aug 14, 6:02 AM EDT	Special Weather Statement	PHI	Carbon	88 min
Aug 14, 7:25 AM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh	95 min
Aug 14, 8:06 AM EDT	Special Weather Statement	PHI	Chester, Lehigh	84 min
Aug 14, 8:39 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	2 hr
Aug 14, 9:56 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	108 min
Aug 14, 4:12 PM EDT	Special Weather Statement	PHI	Delaware	63 min
Aug 14, 4:15 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	60 min
Aug 14, 12:49 PM EDT	Special Weather Statement	PHI	Sussex	56 min
Aug 14, 2:13 PM EDT	Areal Flood Advisory	PHI	Kent	79 min
Aug 14, 2:28 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	2 hr
Aug 14, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	38 min
Aug 14, 3:22 PM EDT	Special Weather Statement	PHI	New Castle	53 min
Aug 14, 4:54 PM EDT	Special Weather Statement	PHI	Kent	66 min
Aug 14, 6:44 PM EDT	Special Weather Statement	PHI	Sussex	61 min
Aug 14, 7:42 AM EDT	Special Weather Statement	PHI	Kent	63 min
Aug 14, 2:02 PM EDT	Special Weather Statement	PHI	Queen Anne's	58 min

Nearby

Special Weather Statements in Pennsylvania, 2012 Special Weather Statements in New Jersey, 2012 Every special weather statement in 2012

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; radar from the NEXRAD Level II archive.