Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 11, 2012Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 11, 2012, 7:33 PM EDT for Bucks County, Pennsylvania. It was in force for 27 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 11, 2012, 7:33 PM EDT (23:33 UTC)
Expired: Aug 11, 2012, 8:00 PM EDT
In force: 27 min
Issued by: NWS Philadelphia/Mount Holly

County Bucks County, PA

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 23:33 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

Brookhaven, NY (KOKX), launched 12:00Z, 11.6 hours before the alert went out and 206 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: 1829 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

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

094 
WWUS81 KPHI 112333
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
733 PM EDT SAT AUG 11 2012

PAZ068-069-120000-
BUCKS PA-MONTGOMERY PA-
733 PM EDT SAT AUG 11 2012

...A POTENTIALLY STRONG THUNDERSTORM WILL AFFECT BUCKS AND 
MONTGOMERY COUNTIES IN SOUTHEAST PENNSYLVANIA...

AT 729 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
THUNDERSTORM 7 MILES NORTH OF PHILADELPHIA...MOVING NORTHEAST AT 10 
MPH. THE THUNDERSTORM WILL BE NEAR WILLOW GROVE...BRYN ATHYN...MAPLE 
GLEN AROUND 740 PM...HORSHAM AROUND 745 PM...HATBORO AROUND 750 
PM...WARMINSTER HEIGHTS AROUND 755 PM AND IVYLAND AROUND 800 PM.

VERY HEAVY RAIN WILL BRIEFLY FALL FROM THIS STORM...AND WILL CAUSE 
WATER TO POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

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

A WIND GUST TO 35 MPH IS POSSIBLE WITH THIS STORM. 

LAT...LON 4026 7515 4017 7498 4009 7510 4010 7526

$$

FORECASTER:DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 11:51 AM EDT	Special Weather Statement	PHI	Sussex, Warren	54 min
Aug 11, 11:57 AM EDT	Special Weather Statement	PHI	Cape May, Cumberland	63 min
Aug 11, 1:06 PM EDT	Special Weather Statement	PHI	Cumberland	39 min
Aug 11, 1:38 PM EDT	Special Marine Warning	PHI		37 min
Aug 11, 1:45 PM EDT	Special Weather Statement	PHI	Cape May	45 min
Aug 11, 2:12 PM EDT	Special Weather Statement	PHI	Cape May	48 min
Aug 11, 2:35 PM EDT	Special Weather Statement	PHI	Cape May	25 min
Aug 11, 3:01 PM EDT	Special Weather Statement	PHI	Cape May	44 min
Aug 11, 3:10 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Ocean	62 min
Aug 11, 3:25 PM EDT	Special Marine Warning	PHI		35 min
Aug 11, 4:04 PM EDT	Flash Flood Warning	PHI	Atlantic, Cape May	114 min
Aug 11, 5:20 PM EDT	Special Weather Statement	PHI	Atlantic	40 min
Aug 11, 6:42 PM EDT	Special Weather Statement	PHI	Salem	33 min
Aug 11, 6:49 PM EDT	Special Weather Statement	PHI	Morris	26 min
Aug 11, 6:52 PM EDT	Special Weather Statement	PHI	Somerset	23 min
Aug 11, 7:17 PM EDT	Special Weather Statement	PHI	Gloucester	28 min
Aug 11, 7:19 PM EDT	Special Weather Statement	PHI	Sussex	26 min
Aug 11, 7:56 PM EDT	Special Weather Statement	PHI	Mercer	34 min
Aug 11, 6:07 PM EDT	Special Weather Statement	PHI	Bucks	38 min
Aug 11, 6:11 PM EDT	Special Weather Statement	PHI	Chester	49 min
Aug 11, 7:52 PM EDT	Special Weather Statement	PHI	Chester	23 min
Aug 11, 11:44 AM EDT	Special Weather Statement	PHI	Kent	61 min
Aug 11, 3:20 PM EDT	Special Weather Statement	PHI	Sussex	85 min
Aug 11, 4:21 PM EDT	Special Weather Statement	PHI	Sussex	39 min
Aug 11, 5:12 PM EDT	Special Weather Statement	PHI	Caroline	63 min
Aug 11, 7:09 PM EDT	Special Weather Statement	PHI	Kent	36 min

Nearby

Special Weather Statements in Pennsylvania, 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.