Alert archive / Pennsylvania / Freeze Warnings in 2012

Freeze Warning 11, NWS Pittsburgh, PA

April 24, 201211 counties in Pennsylvania; Carroll County, Columbiana County, Tuscarawas County, Ohio

NWS Pittsburgh, PA issued this freeze warning at Apr 24, 2012, 4:00 PM EDT for 11 counties in Pennsylvania; Carroll County, Columbiana County, Tuscarawas County, Ohio. It took effect at Apr 25, 2012, 4:00 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 24, 2012, 4:00 PM EDT (20:00 UTC)
In effect from: Apr 25, 2012, 4:00 AM EDT
Expired: Apr 25, 2012, 3:58 AM EDT
In force
Issued by: NWS Pittsburgh, PA

Counties Carroll County, OH, Columbiana County, OH, Tuscarawas County, OH, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Fayette County, PA, Forest County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 40 km from the middle of the area, began a volume at 19:58 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

Pittsburgh, PA (KPIT), launched 12:00Z, 8.0 hours before the alert went out and 50 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1552 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this freeze warning went out at Apr 23, 7:42 PM EDT, 20 hours 18 minutes earlier.

Area forecast discussion, Apr 23, 7:42 PM EDT, 20 hours 18 minutes before

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Nearby

Freeze Warnings in Pennsylvania, 2012 Freeze Warnings in Ohio, 2012 Freeze Warnings in West Virginia, 2012 Every 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.