Alert archive / Virginia / Winter Storm Watches in 2015

Winter Storm Watch 3, NWS Blacksburg, VA

February 24, 201514 counties in Virginia; 9 counties in North Carolina

NWS Blacksburg, VA issued this winter storm watch at Feb 24, 2015, 3:40 PM EST for 14 counties in Virginia; 9 counties in North Carolina. It took effect at Feb 25, 2015, 7:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 24, 2015, 3:40 PM EST (20:40 UTC)
In effect from: Feb 25, 2015, 7:00 PM EST
Expired: Feb 25, 2015, 3:01 AM EST
In force
Issued by: NWS Blacksburg, VA

All 23 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, Carroll County, VA, Charlotte County, VA, City of Danville, VA, City of Galax, VA, City of Martinsville, VA, Floyd County, VA, Franklin County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Patrick County, VA, Pittsylvania County, VA, Smyth County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 46 km from the middle of the area, began a volume at 20:45 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 12:00Z, 8.7 hours before the alert went out and 73 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: 640 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 206 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 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 winter storm watch went out at Feb 24, 12:46 PM EST, 2 hours 54 minutes earlier.

Area forecast discussion, Feb 24, 12:46 PM EST, 2 hours 54 minutes before

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Hazardous weather outlook, Feb 24, 12:07 PM EST, 3 hours 33 minutes before

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In the hours before

Local storm report, Feb 24, 1:00 PM EST, 2 hours 40 minutes before

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Local storm report, Feb 24, 1:42 PM EST, 1 hour 58 minutes before

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Local storm report, Feb 24, 1:49 PM EST, 1 hour 51 minutes before

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Local storm report, Feb 24, 1:57 PM EST, 1 hour 43 minutes before

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Local storm report, Feb 24, 2:12 PM EST, 1 hour 28 minutes before

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Local storm report, Feb 24, 2:24 PM EST, 1 hour 16 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
Feb 24, 3:57 AM EST	Winter Weather Advisory	RNK	Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more	8 hr

Nearby

Winter Storm Watches in Virginia, 2015 Winter Storm Watches in North Carolina, 2015 Every winter storm watch in 2015

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.