Alert archive / Virginia / Mesoscale Discussions in 2009

Mesoscale Discussion 2297

December 25, 20095 counties in North Carolina; 31 counties in Virginia; 5 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Dec 25, 2009, 6:31 AM EST for 5 counties in North Carolina; 31 counties in Virginia; 5 counties in West Virginia. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Dec 25, 2009, 6:31 AM EST (11:31 UTC)
Expired: Dec 25, 2009, 11:00 AM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 41 counties

Alleghany County, NC, Stokes County, NC, Surry County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Augusta 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 Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Henry County, VA, Highland County, VA, Montgomery County, VA, Patrick County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Wythe County, VA, Greenbrier County, WV, Mercer County, WV, Monroe County, WV, Pocahontas County, WV, Summers County, WV

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 11.5 hours before the alert went out and 61 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: 1749 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 24, 11:11 PM EST	Mesoscale Discussion	SPC	Alleghany, Ashe, Avery, Caldwell, McDowell, Mitchell and 5 more	6 hr

Nearby

Mesoscale Discussions in Virginia, 2009 Mesoscale Discussions in North Carolina, 2009 Mesoscale Discussions in West Virginia, 2009 Every mesoscale discussion in 2009

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.