Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 7, 20124 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 7, 2012, 4:49 PM EDT for 4 counties in Pennsylvania. It was in force for 86 min. 7 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
Jul 7, 2012, 4:49 PM EDT (20:49 UTC)
Expired
Jul 7, 2012, 6:15 PM EDT
In force
86 min
Issued by
NWS Philadelphia/Mount Holly

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 150 km from the middle of the area, began a volume at 20:52 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

TimeReportWhereRemark
Jul 7, 5:25 PM EDTTSTM WND DMGBeaver Meadows, PANUMEROUS TREES DOWN IN CARBON COUNTY FROM AROUND BEAVER MEADOWS TO AROUND BOWMANSTOWN.
Jul 7, 5:45 PM EDTTSTM WND DMGSlatington, PADOWNED TREES
Jul 7, 5:45 PM EDTTSTM WND DMGWalnutport, PALARGE LIMBS DOWN.
Jul 7, 5:55 PM EDTTSTM WND DMGAllentown, PASEPARATE REPORT... LARGE TREE LIMBS DOWN.
Jul 7, 5:56 PM EDTTSTM WND GST 50Allentown Airport, PA
Jul 7, 6:00 PM EDTTSTM WND GST 68Allentown, PA
Jul 7, 6:18 PM EDTTSTM WND GST 50Breinigsville, PA

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.8 hours before the alert went out and 230 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, Washington/Dulle, VA at 12:00Z on 2012-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1804 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, Washington/Dulle, VA at 12:00Z on 2012-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 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
1804 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1395 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

480 
WWUS81 KPHI 072049
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
449 PM EDT SAT JUL 7 2012

NJZ007-PAZ054-055-060>062-068-069-072215-
BERKS PA-BUCKS PA-CARBON PA-LEHIGH PA-MONROE PA-MONTGOMERY PA-
NORTHAMPTON PA-WARREN NJ-
449 PM EDT SAT JUL 7 2012

...STRONG THUNDERSTORMS WILL AFFECT BERKS...BUCKS...CARBON...
LEHIGH...MONROE...MONTGOMERY...NORTHAMPTON AND WARREN COUNTIES...

AT 447 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 21 MILES WEST OF 
WILKES-BARRE TO 76 MILES WEST OF WILKES-BARRE...MOVING SOUTHEAST AT 
40 MPH. THE THUNDERSTORMS WILL BE NEAR TRESCKOW AROUND 515 PM...EAST 
SIDE...WEATHERLY AROUND 530 PM...ALBRIGHTSVILLE...WANAMAKERS AROUND 
545 PM...PENN FOREST RESERVOIR...GILBERT AROUND 600 PM...CHAPMAN AND 
ALBURTIS AROUND 615 PM.

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.

LAT...LON 4052 7624 4058 7602 4065 7599 4074 7577
      4091 7600 4101 7575 4108 7578 4113 7571
      4077 7511 4043 7526 4031 7559 4037 7625
      4049 7643 4050 7643

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 12:30 PM EDTSpecial Weather StatementPHIMorris, Sussex90 min
Jul 7, 5:57 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Warren63 min
Jul 7, 6:25 PM EDTSevere Thunderstorm WarningPHIHunterdon, Somerset, Warren37 min
Jul 7, 6:54 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Monmouth, Ocean, Somerset46 min
Jul 7, 7:03 PM EDTSpecial Weather StatementPHIBurlington, Camden, Gloucester57 min
Jul 7, 7:22 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean53 min
Jul 7, 7:24 PM EDTSpecial Marine WarningPHI96 min
Jul 7, 7:42 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean63 min
Jul 7, 7:55 PM EDTSpecial Weather StatementPHIAtlantic65 min
Jul 7, 5:07 PM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Lehigh, Monroe, Northampton53 min
Jul 7, 6:58 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery48 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.