Alert archive / Pennsylvania / Special Weather Statements in 2013

Special Weather Statement, NWS Philadelphia/Mount Holly

October 7, 2013Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Oct 7, 2013, 1:33 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 42 min. 2 reports 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: Oct 7, 2013, 1:33 PM EDT (17:33 UTC)
Expired: Oct 7, 2013, 2:15 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly

Counties Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 92 km from the middle of the area, began a volume at 17:33 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.

What was reported inside it

Time	Report	Where	Remark
Oct 7, 2:15 PM EDT	TSTM WND DMG	Solebury Twp, PA	TREES DOWN
Oct 7, 2:15 PM EDT	TSTM WND DMG	Solebury Twp, PA	TREES UPROOTED AND SOME TREES DOWN ON HOMES.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.6 hours before the alert went out and 106 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: 114 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

371 
WWUS81 KPHI 071733
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
133 PM EDT MON OCT 7 2013

NJZ009-PAZ061-070-071-102>106-071815-
DELAWARE PA-EASTERN CHESTER PA-EASTERN MONTGOMERY PA-HUNTERDON NJ-
LEHIGH PA-LOWER BUCKS PA-PHILADELPHIA PA-UPPER BUCKS PA-
WESTERN MONTGOMERY PA-
133 PM EDT MON OCT 7 2013

...SHOWERS WITH STRONG WIND GUSTS WILL AFFECT BUCKS...EAST CENTRAL
CHESTER...MONTGOMERY...NORTH CENTRAL DELAWARE...NORTHERN
PHILADELPHIA...SOUTHEASTERN LEHIGH AND WESTERN HUNTERDON COUNTIES...

AT 129 PM EDT...SHOWERS WITH STRONG WIND GUSTS WERE LOCATED FROM EAST
GREENVILLE TO TRAPPE TO WEST GOSHEN...MOVING NORTHEAST AT 30 MPH.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE SHOWERS. 

THERE MAY BE AN ISOLATED EMBEDDED THUNDERSTORM. 

BRIEF BUT VERY HEAVY RAIN WILL FALL FROM THESE SHOWERS...AND WILL 
CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN 
CAN CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS. 

THESE SHOWERS WILL BE NEAR ZIONSVILLE AROUND 140 PM...COOPERSBURG
AROUND 150 PM...PLEASANT VALLEY AROUND 200 PM...ABINGTON AROUND 210
PM AND WILLOW GROVE AROUND 220 PM.

LAT...LON 4007 7555 4010 7546 4013 7547 4014 7551
      4016 7550 4015 7552 4018 7551 4038 7559
      4045 7553 4047 7556 4055 7535 4054 7534
      4068 7499 4045 7491 4012 7500 3990 7562

$$

FORECASTER:  DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 1:30 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Sussex, Warren	60 min
Oct 7, 1:37 PM EDT	Special Weather Statement	PHI	Salem	53 min
Oct 7, 1:59 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	46 min
Oct 7, 2:24 PM EDT	Special Weather Statement	PHI	Morris, Somerset	51 min
Oct 7, 2:33 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	42 min
Oct 7, 3:02 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	43 min
Oct 7, 3:49 PM EDT	Special Marine Warning	PHI		56 min
Oct 7, 4:05 PM EDT	Special Weather Statement	PHI	Monmouth, Ocean	40 min
Oct 7, 11:31 AM EDT	Special Weather Statement	PHI	Berks, Chester	59 min
Oct 7, 11:50 AM EDT	Severe Thunderstorm Warning	PHI	Berks	40 min
Oct 7, 12:12 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	63 min
Oct 7, 12:41 PM EDT	Special Weather Statement	PHI	Chester	64 min
Oct 7, 12:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	41 min
Oct 7, 1:05 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	25 min
Oct 7, 2:18 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	57 min
Oct 7, 3:21 PM EDT	Special Weather Statement	PHI	Sussex	39 min

Nearby

Special Weather Statements in Pennsylvania, 2013 Every special weather statement in 2013

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.