Alert archive / West Virginia / Snow Squall Warnings in 2019

Snow Squall Warning 4, NWS Pittsburgh, PA

December 18, 2019Preston County, West Virginia

NWS Pittsburgh, PA issued this snow squall warning at Dec 18, 2019, 6:54 PM EST for Preston County, West Virginia. It was in force for 51 min. 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 18, 2019, 6:54 PM EST (23:54 UTC)
Expired
Dec 18, 2019, 7:45 PM EST
In force
51 min
Issued by
NWS Pittsburgh, PA
Area
Storm-based polygon

County Preston County, WV

The radar

The Pittsburgh radar (KPBZ), 127 km from the middle of the area, began a volume at 23:56 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, 11.9 hours before the alert went out and 111 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 12:00Z on 2019-12-18Temperature 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 12:00Z on 2019-12-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
588 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
105 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 18, 10:51 AM ESTSpecial Weather StatementPBZClarion, Jefferson, Mercer54 min
Dec 18, 10:55 AM ESTSpecial Weather StatementPBZAllegheny, Beaver, Westmoreland65 min
Dec 18, 11:51 AM ESTSpecial Weather StatementPBZArmstrong, Butler, Clarion, Indiana, Jefferson, Lawrence and 1 more84 min
Dec 18, 12:19 PM ESTSpecial Weather StatementPBZArmstrong, Butler, Clarion, Indiana, Jefferson, Lawrence and 1 more86 min
Dec 18, 12:29 PM ESTSpecial Weather StatementPBZAllegheny91 min
Dec 18, 1:02 PM ESTSpecial Weather StatementPBZAllegheny43 min
Dec 18, 1:50 PM ESTSpecial Weather StatementPBZAllegheny, Washington, Westmoreland55 min
Dec 18, 2:12 PM ESTSnow Squall WarningPBZAllegheny, Fayette, Washington, Westmoreland63 min
Dec 18, 3:14 PM ESTSnow Squall WarningPBZAllegheny, Fayette, Washington, Westmoreland61 min
Dec 18, 4:16 PM ESTSpecial Weather StatementPBZFayette59 min
Dec 18, 4:32 PM ESTSpecial Weather StatementPBZGreene43 min
Dec 18, 5:31 PM ESTSpecial Weather StatementPBZFayette44 min
Dec 18, 1:51 PM ESTWind Chill AdvisoryPBZTucker18 hr

Nearby

Snow Squall Warnings in West Virginia, 2019Every snow squall warning in 2019

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.