Alert archive / Virginia / Freeze Watches in 2012

Freeze Watch 2, NWS Blacksburg, VA

April 9, 201223 counties in Virginia; Alleghany County, Ashe County, Watauga County, North Carolina; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this freeze watch at Apr 9, 2012, 3:35 PM EDT for 23 counties in Virginia; Alleghany County, Ashe County, Watauga County, North Carolina; Mercer County, Monroe County, Summers County, West Virginia. It took effect at Apr 11, 2012, 2:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued: Apr 9, 2012, 3:35 PM EDT (19:35 UTC)
In effect from: Apr 11, 2012, 2:00 AM EDT
Expired: Apr 10, 2012, 3:03 AM EDT
In force
Issued by: NWS Blacksburg, VA

All 29 counties

Alleghany County, NC, Ashe County, NC, Watauga County, NC, Alleghany County, VA, Bath 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 Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Giles County, VA, Grayson County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge 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), 32 km from the middle of the area, began a volume at 19:37 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, 7.6 hours before the alert went out and 139 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: 2628 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -202 m²/s²
0-3 km storm-relative helicity: -18 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 freeze 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 freeze watch went out at Apr 9, 2:09 PM EDT, 1 hour 26 minutes earlier.

Area forecast discussion, Apr 9, 2:09 PM EDT, 1 hour 26 minutes before

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Hazardous weather outlook, Apr 9, 11:42 AM EDT, 3 hours 53 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
Apr 9, 10:51 AM EDT	Fire Weather Watch	RNK	Alleghany, Amherst, Appomattox, Bath, Bedford, Botetourt and 23 more	16 hr

Nearby

Freeze Watches in Virginia, 2012 Freeze Watches in North Carolina, 2012 Freeze Watches in West Virginia, 2012 Every freeze watch in 2012

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.