Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2012Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2012, 2:51 PM EDT for Northampton County, Pennsylvania. It was in force for 54 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
Aug 4, 2012, 2:51 PM EDT (18:51 UTC)
Expired
Aug 4, 2012, 3:45 PM EDT
In force
54 min
Issued by
NWS Philadelphia/Mount Holly

County Northampton County, PA

The radar

The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 18:53 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
Aug 4, 3:35 PM EDTTSTM WND DMGEaston, PATREES AND WIRES DOWN.

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, 6.9 hours before the alert went out and 200 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 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2028 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 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
2028 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
802 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
22 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.

419 
WWUS81 KPHI 041851
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
251 PM EDT SAT AUG 4 2012

NJZ007-PAZ061-062-068-069-041945-
BUCKS PA-LEHIGH PA-MONTGOMERY PA-NORTHAMPTON PA-WARREN NJ-
251 PM EDT SAT AUG 4 2012

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

AT 249 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
STRONG THUNDERSTORM NEAR RICHLANDTOWN...MOVING NORTH AT 15 MPH. THE 
THUNDERSTORM WILL BE NEAR SPRINGTOWN AND PLEASANT VALLEY AROUND 300 
PM...HELLERTOWN AND FREEMANSBURG AROUND 315 PM...OLD ORCHARD AND 
GLENDON AROUND 330 PM...AND PALMER HEIGHTS AND WILSON AROUND 345 PM.

THERE WERE OTHER STRONG THUNDERSTORMS IN THE AREA...AS WELL.

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

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.

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

LAT...LON 4083 7504 4066 7509 4063 7514 4058 7519
      4057 7518 4058 7514 4057 7511 4022 7521
      4024 7550 4081 7550 4082 7543 4085 7533

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 1:26 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden34 min
Aug 4, 2:13 PM EDTSevere Thunderstorm WarningPHISalem62 min
Aug 4, 2:28 PM EDTSpecial Marine WarningPHI62 min
Aug 4, 2:53 PM EDTSpecial Weather StatementPHIMercer67 min
Aug 4, 3:21 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren54 min
Aug 4, 3:35 PM EDTSpecial Marine WarningPHI38 min
Aug 4, 3:42 PM EDTSpecial Weather StatementPHIMiddlesex, Somerset63 min
Aug 4, 3:47 PM EDTSmall Craft AdvisoryPHI39 hr
Aug 4, 4:01 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Morris, Somerset59 min
Aug 4, 5:30 PM EDTSmall Craft AdvisoryPHI4 hr
Aug 4, 1:12 PM EDTSpecial Weather StatementPHIPhiladelphia63 min
Aug 4, 1:46 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery44 min
Aug 4, 3:55 PM EDTSpecial Weather StatementPHILebanon65 min
Aug 4, 4:08 PM EDTSpecial Weather StatementPHICarbon, Monroe52 min
Aug 4, 4:49 PM EDTSpecial Weather StatementPHICarbon, Monroe56 min
Aug 4, 1:18 PM EDTSpecial Weather StatementPHINew Castle57 min
Aug 4, 2:43 PM EDTAreal Flood AdvisoryPHINew Castle105 min
Aug 4, 3:31 PM EDTFlash Flood WarningPHINew Castle57 min
Aug 4, 3:31 PM EDTSevere Thunderstorm WarningPHIKent, New Castle28 min
Aug 4, 5:07 PM EDTSpecial Weather StatementPHIKent53 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.