Alert archive / Virginia / Winter Weather Advisories in 2021

Winter Weather Advisory 9, NWS Blacksburg, VA

January 30, 2021Smyth County, Tazewell County, Virginia

NWS Blacksburg, VA issued this winter weather advisory at Jan 30, 2021, 5:19 AM EST for Smyth County, Tazewell County, Virginia. It took effect at Jan 30, 2021, 10:00 PM EST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jan 30, 2021, 5:19 AM EST (10:19 UTC)
In effect from: Jan 30, 2021, 10:00 PM EST
Expired: Jan 31, 2021, 10:23 AM EST
In force: 12 hr
Issued by: NWS Blacksburg, VA

Counties Smyth County, VA, Tazewell County, VA

The radar

The Roanoke radar (KFCX), 113 km from the middle of the area, began a volume at 10:19 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, 10.3 hours before the alert went out and 178 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: 2267 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: 59 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 30, 12:58 AM EST, 4 hours 21 minutes earlier.

Area forecast discussion, Jan 30, 12:58 AM EST, 4 hours 21 minutes before

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Hazardous weather outlook, Jan 29, 3:08 PM EST, 14 hours 11 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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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 30, 5:19 AM EST	Winter Storm Warning	RNK	Alleghany, Amherst, Appomattox, Bath, Bedford, Bland and 29 more	33 hr

Nearby

Winter Weather Advisories in 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.