Alert archive / Virginia / Winter Weather Advisories in 2021

Winter Weather Advisory 8, NWS Blacksburg, VA

January 27, 202123 counties in Virginia; 9 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this winter weather advisory at Jan 27, 2021, 4:32 AM EST for 23 counties in Virginia; 9 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia. It took effect at Jan 27, 2021, 6:00 PM EST. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Jan 27, 2021, 4:32 AM EST (09:32 UTC)
In effect from: Jan 27, 2021, 6:00 PM EST
Expired: Jan 28, 2021, 12:00 PM EST
In force: 18 hr
Issued by: NWS Blacksburg, VA

All 35 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, Bland County, VA, Carroll County, VA, City of Danville, VA, City of Galax, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles 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, Smyth County, VA, Tazewell County, VA, Wythe County, VA, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 28 km from the middle of the area, began a volume at 09:34 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, 9.5 hours before the alert went out and 102 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: 1846 m above ground
0-6 km bulk shear: 84 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 132 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 Jan 27, 4:17 AM EST, 15 minutes earlier.

Area forecast discussion, Jan 27, 4:17 AM EST, 15 minutes before

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Hazardous weather outlook, Jan 26, 9:14 PM EST, 7 hours 18 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
Jan 26, 7:40 PM EST	Dense Fog Advisory	RNK	Amherst, Appomattox, Bedford, Botetourt, Buckingham, Campbell and 15 more	11 hr
Jan 27, 4:32 AM EST	Winter Storm Warning	RNK	Bland, Grayson, Tazewell	31 hr

Nearby

Winter Weather Advisories in Virginia, 2021 Winter Weather Advisories in North Carolina, 2021 Winter Weather Advisories in West Virginia, 2021 Every winter weather advisory in 2021

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.