Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 15, 2012Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 15, 2012, 3:29 PM EDT for Bucks County, Pennsylvania. It was in force for 61 min. 1 report 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: Jul 15, 2012, 3:29 PM EDT (19:29 UTC)
Expired: Jul 15, 2012, 4:30 PM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly

County Bucks County, PA

The radar

The Philadelphia radar (KDIX), 59 km from the middle of the area, began a volume at 19:29 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
Jul 15, 3:50 PM EDT	TSTM WND DMG	Buckingham, PA	COUPLE OF TREES DOWN BLOCKING ROADS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.5 hours before the alert went out and 195 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: 88 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 97 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.

847 
WWUS81 KPHI 151929
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
329 PM EDT SUN JUL 15 2012

PAZ069-152030-
BUCKS PA-
329 PM EDT SUN JUL 15 2012

...A STRONG THUNDERSTORM WILL AFFECT BUCKS COUNTY...

AT 325 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 21 MILES SOUTHEAST OF ALLENTOWN...MOVING
SOUTHEAST AT 20 MPH. THE THUNDERSTORM WILL BE NEAR NEW BRITAIN...
CHALFONT AROUND 345 PM...IVYLAND...WARMINSTER HEIGHTS AROUND 400
PM...NEWTOWN...RICHBORO AROUND 415 PM...LANGHORNE AND LANGHORN AROUND
430 PM.

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

EXPECT SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING
FROM THIS STORM.

LAT...LON 4009 7495 4011 7497 4012 7496 4013 7501
      4032 7532 4040 7527 4032 7492 4029 7486
      4027 7485

$$

FORECASTER: AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 3:44 PM EDT	Excessive Heat Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Morris and 1 more	4 days
Jul 15, 4:01 PM EDT	Special Weather Statement	PHI	Mercer	59 min
Jul 15, 4:59 PM EDT	Special Weather Statement	PHI	Ocean	61 min
Jul 15, 6:10 PM EDT	Special Marine Warning	PHI		65 min
Jul 15, 6:54 PM EDT	Special Marine Warning	PHI		24 min
Jul 15, 7:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	56 min
Jul 15, 7:44 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	61 min
Jul 15, 12:51 PM EDT	Special Weather Statement	PHI	Lehigh	39 min
Jul 15, 1:31 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	59 min
Jul 15, 2:34 PM EDT	Special Weather Statement	PHI	Bucks	56 min
Jul 15, 2:41 PM EDT	Special Weather Statement	PHI	Carbon	64 min
Jul 15, 2:50 PM EDT	Special Weather Statement	PHI	Carbon	55 min
Jul 15, 5:07 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	53 min
Jul 15, 5:58 PM EDT	Special Weather Statement	PHI	Monroe	62 min
Jul 15, 6:13 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	62 min
Jul 15, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	65 min
Jul 15, 7:58 PM EDT	Special Weather Statement	PHI	Berks, Bucks	62 min
Jul 15, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	58 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.