Alert archive / Virginia / Mesoscale Discussions in 2010

Mesoscale Discussion 2012

October 26, 20107 states

The Storm Prediction Center issued this mesoscale discussion at Oct 26, 2010, 11:05 PM EDT for 7 states. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Oct 26, 2010, 11:05 PM EDT (03:05 UTC)
Expired: Oct 27, 2010, 12:00 AM EDT
In force: 55 min
Issued by: the Storm Prediction Center

All 122 counties

Franklin County, GA, Habersham County, GA, Rabun County, GA, Stephens County, GA, Allegany County, MD, Baltimore County, MD, Carroll County, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Washington County, MD, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Henderson County, NC, Iredell County, NC, Lincoln County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rockingham County, NC, Rowan County, NC, Rutherford County, NC, Stokes County, NC, Surry County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Johnson County, TN, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Fairfax, VA, City of Falls Church, VA, City of Galax, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Craig County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Giles County, VA, Grayson County, VA, Greene County, VA, Henry County, VA, Highland County, VA, Loudoun County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Patrick County, VA, Pittsylvania County, VA, Prince William County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Wythe County, VA, Berkeley County, WV, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Monroe County, WV, Morgan County, WV, Pendleton County, WV, Pocahontas County, WV

The radar

The Roanoke radar (KFCX), 83 km from the middle of the area, began a volume at 03:07 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 731Oct 27, 2:45 AM EDT

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.1 hours before the alert went out and 103 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: 945 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 439 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 11.4

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
Oct 26, 9:03 PM EDT	Tornado Watch	SPC	Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 26 more	8 hr
Oct 26, 11:51 PM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Carroll, Chattooga, Cherokee and 30 more	54 min
Oct 27, 12:24 AM EDT	Mesoscale Discussion	SPC	Franklin, Habersham, Rabun, Stephens	66 min
Oct 27, 2:44 AM EDT	Tornado Watch	SPC	Franklin, Habersham, Hart, Rabun, Stephens	7 hr
Oct 27, 5:28 AM EDT	Mesoscale Discussion	SPC	Franklin, Habersham, Hart, Rabun, Stephens, Towns and 2 more	2 hr
Oct 27, 6:29 AM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Carroll, Chattooga, Cherokee and 26 more	61 min
Oct 27, 6:48 AM EDT	Tornado Watch	SPC	Banks, Barrow, Bartow, Carroll, Chattooga, Cherokee and 34 more	6 hr
Oct 27, 8:54 AM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Carroll, Chattooga, Cherokee and 33 more	96 min
Oct 27, 10:40 AM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Butts, Carroll, Clarke, Clayton and 33 more	95 min
Oct 27, 12:49 PM EDT	Tornado Watch	SPC	Banks, Barrow, Butts, Carroll, Clarke, Clayton and 36 more	7 hr
Oct 27, 2:06 PM EDT	Tornado Watch	SPC	Columbia, Elbert, Franklin, Hart, Lincoln, McDuffie	6 hr
Oct 27, 3:41 PM EDT	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Bartow, Butts, Carroll and 48 more	64 min
Oct 27, 4:03 PM EDT	Mesoscale Discussion	SPC	Lincoln	87 min
Oct 27, 7:40 PM EDT	Mesoscale Discussion	SPC	Crawford, Harris, Lamar, Meriwether, Muscogee, Pike and 4 more	65 min
Oct 27, 7:53 PM EDT	Mesoscale Discussion	SPC	Columbia, Lincoln	67 min
Oct 27, 11:54 AM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Caroline, Cecil, Charles and 9 more	66 min
Oct 27, 12:13 PM EDT	Tornado Watch	SPC	Anne Arundel, Baltimore, Calvert, Caroline, Cecil, Charles and 13 more	8 hr
Oct 27, 3:21 PM EDT	Mesoscale Discussion	SPC	Calvert, Caroline, Charles, Dorchester, Queen Anne's, Saint Mary's and 3 more	54 min
Oct 27, 4:48 PM EDT	Mesoscale Discussion	SPC	Calvert, Caroline, Charles, Dorchester, Queen Anne's, Saint Mary's and 3 more	57 min
Oct 27, 7:16 PM EDT	Mesoscale Discussion	SPC	Calvert, Charles, Dorchester, Saint Mary's, Somerset, Wicomico and 1 more	59 min
Oct 27, 7:46 PM EDT	Tornado Watch	SPC	Calvert, Charles, Dorchester, Saint Mary's, Somerset, Wicomico and 1 more	8 hr
Oct 27, 1:46 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Cabarrus, Chatham, Davidson, Durham and 15 more	89 min

Nearby

Mesoscale Discussions in Virginia, 2010 Mesoscale Discussions in North Carolina, 2010 Mesoscale Discussions in West Virginia, 2010 Every mesoscale discussion in 2010

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.