Alert archive / Virginia / Winter Weather Advisories in 2012

Winter Weather Advisory 13, NWS Blacksburg, VA

October 31, 2012Bland County, Tazewell County, Virginia; Mercer County, Summers County, West Virginia

NWS Blacksburg, VA issued this winter weather advisory at Oct 31, 2012, 3:17 PM EDT for Bland County, Tazewell County, Virginia; Mercer County, Summers County, West Virginia. It was in force for 19 hr.

The area

The counties it named.

The facts

Issued: Oct 31, 2012, 3:17 PM EDT (19:17 UTC)
Expired: Nov 1, 2012, 10:31 AM EDT
In force: 19 hr
Issued by: NWS Blacksburg, VA

Counties Bland County, VA, Tazewell County, VA, Mercer County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 86 km from the middle of the area, began a volume at 19:14 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.3 hours before the alert went out and 327 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: 495 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 103 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 weather advisory 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 weather advisory went out at Oct 31, 3:07 PM EDT, 10 minutes earlier.

Area forecast discussion, Oct 31, 3:07 PM EDT, 10 minutes before

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Hazardous weather outlook, Oct 31, 2:29 PM EDT, 48 minutes before

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In the hours before

Local storm report, Oct 31, 9:55 AM EDT, 5 hours 22 minutes before

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Local storm report, Oct 31, 10:36 AM EDT, 4 hours 41 minutes before

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Local storm report, Oct 31, 11:06 AM EDT, 4 hours 11 minutes before

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Local storm report, Oct 31, 11:31 AM EDT, 3 hours 46 minutes before

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Local storm report, Oct 31, 12:09 PM EDT, 3 hours 8 minutes before

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Local storm report, Oct 31, 12:24 PM EDT, 2 hours 53 minutes before

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The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 31, 4:16 AM EDT	Winter Weather Advisory	RNK	Alleghany, Bath, Grayson, Smyth, Tazewell, City of Covington	11 hr
Oct 31, 4:16 AM EDT	Winter Storm Warning	RNK		11 hr

Nearby

Winter Weather Advisories in Virginia, 2012 Winter Weather Advisories in West Virginia, 2012 Every winter weather advisory 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.