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, 6:07 PM EDT for Bucks County, Pennsylvania. It was in force for 38 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, 6:07 PM EDT (22:07 UTC)
Expired
Aug 11, 2012, 6:45 PM EDT
In force
38 min
Issued by
NWS Philadelphia/Mount Holly

County Bucks County, PA

The radar

The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 22:07 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, 10.1 hours before the alert went out and 205 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2012-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1829 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2012-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

074 
WWUS81 KPHI 112207
SPSPHI

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

NJZ009-010-015-PAZ068>071-112245-
BUCKS PA-DELAWARE PA-HUNTERDON NJ-MERCER NJ-MONTGOMERY PA-
PHILADELPHIA PA-SOMERSET NJ-
607 PM EDT SAT AUG 11 2012

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

AT 603 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SCATTERED HEAVY SHOWERS WITH ISOLATED EMBEDDED STRONG THUNDERSTORMS 
ALONG A LINE EXTENDING FROM 8 MILES WEST OF TRENTON TO 11 MILES 
NORTH OF PHILADELPHIA TO 8 MILES NORTHWEST OF PHILADELPHIA TO 9 
MILES EAST OF WEST CHESTER...MOVING NORTHEAST AT 10 TO 15 MPH. THE 
THUNDERSTORMS WILL BE NEAR YARDLEY...EWING AROUND 615 
PM...EWING...RICHBORO AROUND 630 PM...MAPLE GLEN AND AMBLER AROUND 
645 PM.

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

WIND GUSTS TO 30 OR 35 MPH ARE POSSIBLE WITH ONE OR TWO OF THESE 
STORMS.

THERE WILL BE A FEW LIGHTNING STRIKES. 

LAT...LON 4032 7472 4022 7485 4000 7530 3993 7549
      4003 7541 4004 7541 4006 7537 4006 7539
      4009 7542 4016 7540 4031 7510 4042 7496
      4059 7479 4051 7457

$$

FORECASTER:DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 11:51 AM EDTSpecial Weather StatementPHISussex, Warren54 min
Aug 11, 11:57 AM EDTSpecial Weather StatementPHICape May, Cumberland63 min
Aug 11, 1:06 PM EDTSpecial Weather StatementPHICumberland39 min
Aug 11, 1:38 PM EDTSpecial Marine WarningPHI37 min
Aug 11, 1:45 PM EDTSpecial Weather StatementPHICape May45 min
Aug 11, 2:12 PM EDTSpecial Weather StatementPHICape May48 min
Aug 11, 2:35 PM EDTSpecial Weather StatementPHICape May25 min
Aug 11, 3:01 PM EDTSpecial Weather StatementPHICape May44 min
Aug 11, 3:10 PM EDTAreal Flood AdvisoryPHIAtlantic, Cape May, Ocean62 min
Aug 11, 3:25 PM EDTSpecial Marine WarningPHI35 min
Aug 11, 4:04 PM EDTFlash Flood WarningPHIAtlantic, Cape May114 min
Aug 11, 5:20 PM EDTSpecial Weather StatementPHIAtlantic40 min
Aug 11, 6:42 PM EDTSpecial Weather StatementPHISalem33 min
Aug 11, 6:49 PM EDTSpecial Weather StatementPHIMorris26 min
Aug 11, 6:52 PM EDTSpecial Weather StatementPHISomerset23 min
Aug 11, 7:17 PM EDTSpecial Weather StatementPHIGloucester28 min
Aug 11, 7:19 PM EDTSpecial Weather StatementPHISussex26 min
Aug 11, 7:56 PM EDTSpecial Weather StatementPHIMercer34 min
Aug 11, 6:11 PM EDTSpecial Weather StatementPHIChester49 min
Aug 11, 7:33 PM EDTSpecial Weather StatementPHIBucks27 min
Aug 11, 7:52 PM EDTSpecial Weather StatementPHIChester23 min
Aug 11, 11:44 AM EDTSpecial Weather StatementPHIKent61 min
Aug 11, 3:20 PM EDTSpecial Weather StatementPHISussex85 min
Aug 11, 4:21 PM EDTSpecial Weather StatementPHISussex39 min
Aug 11, 5:12 PM EDTSpecial Weather StatementPHICaroline63 min
Aug 11, 7:09 PM EDTSpecial Weather StatementPHIKent36 min

Nearby

Special Weather Statements in Pennsylvania, 2012Every 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.