Alert archive / Pennsylvania / Winter Storm Warnings in 2008

Winter Storm Warning 1, NWS Pittsburgh, PA

December 31, 2007Forest County, Mercer County, Venango County, Pennsylvania

NWS Pittsburgh, PA issued this winter storm warning at Dec 31, 2007, 9:44 PM EST for Forest County, Mercer County, Venango County, Pennsylvania. It took effect at Jan 1, 2008, 6:00 AM EST. It was in force for 31 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 31, 2007, 9:44 PM EST (02:44 UTC)
In effect from
Jan 1, 2008, 6:00 AM EST
Expired
Jan 2, 2008, 1:00 PM EST
In force
31 hr
Issued by
NWS Pittsburgh, PA

Counties Forest County, PA, Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 105 km from the middle of the area, began a volume at 02:44 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 00:00Z, 2.7 hours before the alert went out and 115 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, Pittsburgh, PA at 00:00Z on 2008-01-01Temperature 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, Pittsburgh, PA at 00:00Z on 2008-01-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 162 square meters per square second.1939587897117Sfc1 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
1363 m above ground
0-6 km bulk shear
81 kt
0-1 km storm-relative helicity
162 m²/s²
0-3 km storm-relative helicity
224 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
Dec 31, 9:44 PM ESTSnow and Blowing Snow AdvisoryPBZAllegheny, Armstrong, Beaver, Butler, Clarion, Greene and 3 more29 hr

Nearby

Winter Storm Warnings in Pennsylvania, 2008Winter Storm Warnings in West Virginia, 2008Every winter storm warning in 2008

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.