Alert archive / Virginia / Winter Weather Advisories in 2021

Winter Weather Advisory 16, NWS Blacksburg, VA

February 14, 20219 counties in Virginia; Greenbrier County, Monroe County, West Virginia

NWS Blacksburg, VA issued this winter weather advisory at Feb 14, 2021, 1:24 PM EST for 9 counties in Virginia; Greenbrier County, Monroe County, West Virginia. It took effect at Feb 15, 2021, 12:00 AM EST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Feb 14, 2021, 1:24 PM EST (18:24 UTC)
In effect from
Feb 15, 2021, 12:00 AM EST
Expired
Feb 15, 2021, 10:00 AM EST
In force
10 hr
Issued by
NWS Blacksburg, VA

Counties Alleghany County, VA, Amherst County, VA, Bath County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Covington, VA, City of Lexington, VA, Craig County, VA, Rockbridge County, VA, Greenbrier County, WV, Monroe County, WV

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.4 hours before the alert went out and 251 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, Washington/Dulle, VA at 12:00Z on 2021-02-14Temperature 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, Washington/Dulle, VA at 12:00Z on 2021-02-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 square meters per square second.1939587897117Sfc1 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
532 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
122 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 Feb 13, 2:22 PM EST, 23 hours 2 minutes earlier.

Area forecast discussion, Feb 13, 2:22 PM EST, 23 hours 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Feb 14, 3:07 PM ESTFreezing Fog AdvisoryRNKBland, Giles, Montgomery, Pulaski, Smyth, Tazewell and 2 more19 hr

Nearby

Winter Weather Advisories in Virginia, 2021Winter Weather Advisories in West Virginia, 2021Every 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.