Alert archive / Virginia / Winter Storm Warnings in 2009

Winter Storm Warning 6, NWS Blacksburg, VA

March 1, 200928 counties in Virginia; 9 counties in North Carolina

NWS Blacksburg, VA issued this winter storm warning at Mar 1, 2009, 4:39 AM EST for 28 counties in Virginia; 9 counties in North Carolina. It took effect at Mar 1, 2009, 1:09 PM EST. It was in force for 20 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: Mar 1, 2009, 4:39 AM EST (09:39 UTC)
In effect from: Mar 1, 2009, 1:09 PM EST
Expired: Mar 2, 2009, 8:53 AM EST
In force: 20 hr
Issued by: NWS Blacksburg, VA

All 37 counties

Alleghany County, NC, Ashe County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Danville, VA, City of Galax, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Floyd County, VA, Franklin County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 26 km from the middle of the area, began a volume at 09:42 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 00:00Z, 9.7 hours before the alert went out and 96 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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 442 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 450 m²/s²
0-3 km storm-relative helicity: 934 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 warning 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 warning went out at Mar 1, 4:37 AM EST, 2 minutes earlier.

Area forecast discussion, Mar 1, 4:37 AM EST, 2 minutes before

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Hazardous weather outlook, Mar 1, 4:18 AM EST, 21 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
Mar 1, 4:39 AM EST	Winter Weather Advisory	RNK	Alleghany, Bath, Bland, Botetourt, Craig, Giles and 13 more	28 hr

Nearby

Winter Storm Warnings in Virginia, 2009 Winter Storm Warnings in North Carolina, 2009 Every winter storm warning in 2009

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.