Alert archive / Pennsylvania / Freeze Warnings in 2012

Freeze Warning 12, NWS Pittsburgh, PA

April 26, 2012Fayette County, Forest County, Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this freeze warning at Apr 26, 2012, 3:24 PM EDT for Fayette County, Forest County, Westmoreland County, Pennsylvania. It took effect at Apr 27, 2012, 2:00 AM EDT. It was in force for . No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 26, 2012, 3:24 PM EDT (19:24 UTC)
In effect from
Apr 27, 2012, 2:00 AM EDT
Expired
Apr 26, 2012, 8:11 PM EDT
In force
Issued by
NWS Pittsburgh, PA

Counties Fayette County, PA, Forest County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 65 km from the middle of the area, began a volume at 19:26 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.4 hours before the alert went out and 252 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 2012-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
672 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
175 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 5:06 PM EDTSpecial Weather StatementPBZWestmoreland24 min
Apr 26, 5:28 PM EDTSpecial Weather StatementPBZIndiana17 min
Apr 26, 5:45 PM EDTSpecial Weather StatementPBZWestmoreland30 min

Nearby

Freeze Warnings in Pennsylvania, 2012Freeze Warnings in West Virginia, 2012Every freeze warning 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.