Alert archive / Virginia / Winter Storm Watches in 2012

Winter Storm Watch 6, NWS Blacksburg, VA

December 24, 20124 counties in Virginia

NWS Blacksburg, VA issued this winter storm watch at Dec 24, 2012, 3:53 PM EST for 4 counties in Virginia. It took effect at Dec 26, 2012, 1:00 AM EST. It was in force for .

The area

The counties it named.

The facts

Issued
Dec 24, 2012, 3:53 PM EST (20:53 UTC)
In effect from
Dec 26, 2012, 1:00 AM EST
Expired
Dec 25, 2012, 5:32 AM EST
In force
Issued by
NWS Blacksburg, VA

Counties Bath County, VA, City of Buena Vista, VA, City of Lexington, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 114 km from the middle of the area, began a volume at 20:54 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.9 hours before the alert went out and 199 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, Greensboro/Hi Pt, NC at 12:00Z on 2012-12-24Temperature 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, Greensboro/Hi Pt, NC at 12:00Z on 2012-12-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939587897Sfc1 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
1558 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
49 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 winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Blacksburg, VA wrote its last area forecast discussion before this winter storm watch went out at Dec 24, 3:49 PM EST, 4 minutes earlier.

Area forecast discussion, Dec 24, 3:49 PM EST, 4 minutes before
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Hazardous weather outlook, Dec 24, 9:54 AM EST, 5 hours 59 minutes before
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In the hours before

Local storm report, Dec 24, 11:19 AM EST, 4 hours 34 minutes before
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Local storm report, Dec 24, 11:23 AM EST, 4 hours 30 minutes before
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Local storm report, Dec 24, 11:27 AM EST, 4 hours 26 minutes before
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Special weather statement, Dec 24, 12:22 PM EST, 3 hours 31 minutes before
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Nearby

Winter Storm Watches in Virginia, 2012Winter Storm Watches in West Virginia, 2012Every winter storm watch 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.