Alert archive / Virginia / High Wind Watches in 2018

High Wind Watch 1, NWS Blacksburg, VA

February 28, 201829 counties in Virginia; 6 counties in North Carolina

NWS Blacksburg, VA issued this high wind watch at Feb 28, 2018, 10:55 AM EST for 29 counties in Virginia; 6 counties in North Carolina. It took effect at Mar 1, 2018, 6:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 28, 2018, 10:55 AM EST (15:55 UTC)
In effect from: Mar 1, 2018, 6:00 PM EST
Expired: Mar 1, 2018, 3:52 AM EST
In force
Issued by: NWS Blacksburg, VA

All 35 counties

Alleghany County, NC, Ashe County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Carroll County, VA, City of Buena Vista, VA, City of Covington, VA, City of Galax, VA, City of Lexington, 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, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 13 km from the middle of the area, began a volume at 15:58 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

Roanoke, VA (KRNK), launched 12:00Z, 3.9 hours before the alert went out and 82 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: 1880 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 38 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 high wind watch 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 high wind watch went out at Feb 28, 10:49 AM EST, 6 minutes earlier.

Area forecast discussion, Feb 28, 10:49 AM EST, 6 minutes before

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Hazardous weather outlook, Feb 28, 4:24 AM EST, 6 hours 31 minutes before

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Nearby

High Wind Watches in Virginia, 2018 High Wind Watches in North Carolina, 2018 Every high wind watch in 2018

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.