Alert archive / Virginia / Mesoscale Discussions in 2003
Mesoscale Discussion 1940
The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 2:41 PM EDT for 5 states. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2003, 2:41 PM EDT (18:41 UTC)
- Expired
- Jul 21, 2003, 3:45 PM EDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
All 119 counties
Bell County, KY, Floyd County, KY, Harlan County, KY, Knott County, KY, Leslie County, KY, Letcher County, KY, Martin County, KY, Perry County, KY, Pike County, KY, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Stokes County, NC, Surry County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Anderson County, TN, Blount County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Monroe County, TN, Roane County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, Alleghany County, VA, Amherst County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, Carroll County, VA, City of Bristol, 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 Norton, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, Craig County, VA, Dickenson County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Henry County, VA, Highland County, VA, Lee County, VA, Montgomery County, VA, Nelson County, VA, Patrick County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, Boone County, WV, Braxton County, WV, Clay County, WV, Fayette County, WV, Greenbrier County, WV, Kanawha County, WV, Logan County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Pendleton County, WV, Pocahontas County, WV, Raleigh County, WV, Randolph County, WV, Summers County, WV, Webster County, WV, Wyoming County, WV
The radar
The Roanoke radar (KFCX), 139 km from the middle of the area, began a volume at 18:41 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.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.7 hours before the alert went out and 204 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.
- Mixed-layer CAPE
- 2475 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 548 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- -9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 6:03 AM EDT | Mesoscale Discussion | SPC | Boone, Campbell, Carroll, Gallatin, Grant, Henry and 5 more | 117 min |
| Jul 21, 6:10 AM EDT | Severe Thunderstorm Watch | SPC | Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 2 more | 6 hr |
| Jul 21, 7:39 AM EDT | Mesoscale Discussion | SPC | Boyd, Bracken, Carter, Fleming, Greenup, Harrison and 5 more | 96 min |
| Jul 21, 8:03 AM EDT | Mesoscale Discussion | SPC | Allen, Anderson, Barren, Breckinridge, Bullitt, Butler and 31 more | 117 min |
| Jul 21, 8:40 AM EDT | Severe Thunderstorm Watch | SPC | Bath, Boyd, Carter, Elliott, Greenup, Lawrence and 3 more | 5 hr |
| Jul 21, 11:27 AM EDT | Mesoscale Discussion | SPC | Boone, Breckinridge, Bullitt, Butler, Caldwell, Carroll and 33 more | 2 hr |
| Jul 21, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Barren, Boyle, Butler, Caldwell and 34 more | 6 hr |
| Jul 21, 4:14 PM EDT | Mesoscale Discussion | SPC | Allen, Christian, Cumberland, Logan, Monroe, Muhlenberg and 3 more | 2 hr |
| Jul 21, 4:50 PM EDT | Severe Thunderstorm Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 21 more | 4 hr |
Nearby
Mesoscale Discussions in Virginia, 2003Mesoscale Discussions in North Carolina, 2003Mesoscale Discussions in Tennessee, 2003Every mesoscale discussion in 2003
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.