Alert archive / Virginia / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 107
The Storm Prediction Center issued this severe thunderstorm watch at Mar 24, 2012, 3:02 PM EDT for 19 counties in Virginia; 16 counties in West Virginia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2012, 3:02 PM EDT (19:02 UTC)
- Expired
- Mar 24, 2012, 8:04 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 35 counties
Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Augusta County, VA, Bath County, VA, Buckingham County, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Staunton, VA, City of Waynesboro, VA, Highland County, VA, Nelson County, VA, Rockbridge County, VA, Rockingham County, VA, Braxton County, WV, Clay County, WV, Fayette County, WV, Gilmer County, WV, Greenbrier County, WV, Lewis County, WV, Mercer County, WV, Monroe County, WV, Nicholas County, WV, Pendleton County, WV, Pocahontas County, WV, Raleigh County, WV, Randolph County, WV, Summers County, WV, Upshur County, WV, Webster County, WV
The radar
The Charleston,WV radar (KRLX), 131 km from the middle of the area, began a volume at 19:06 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 3:37 PM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Craig, Giles, Montgomery, Pulaski | 53 min |
| Mar 24, 3:41 PM EDT | Severe Thunderstorm Warning | RLX | Braxton, Clay, Nicholas, Webster | 64 min |
| Mar 24, 6:25 PM EDT | Tornado Warning | RNK | Amherst, Bedford, Campbell, City of Lynchburg | 35 min |
| Mar 24, 6:53 PM EDT | Severe Thunderstorm Warning | RNK | Appomattox, Campbell | 37 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Roanoke, VA (KRNK), launched 12:00Z, 7.0 hours before the alert went out and 141 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
- 250 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 519 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- -13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 12:03 PM EDT | Mesoscale Discussion | SPC | Bland, Carroll, Floyd, Franklin, Giles, Grayson and 13 more | 117 min |
| Mar 24, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | Bedford, Bland, Botetourt, Campbell, Carroll, Charlotte and 21 more | 7 hr |
| Mar 24, 2:31 PM EDT | Mesoscale Discussion | SPC | Alleghany, Bland, Carroll, Craig, Floyd, Giles and 8 more | 59 min |
| Mar 24, 2:54 PM EDT | Mesoscale Discussion | SPC | Appomattox, Bedford, Campbell, Floyd, Franklin, Halifax and 5 more | 66 min |
| Mar 24, 3:38 PM EDT | Tornado Watch | SPC | Bedford, Campbell, Carroll, Charlotte, Floyd, Franklin and 7 more | 7 hr |
| Mar 24, 4:16 PM EDT | Mesoscale Discussion | SPC | Alleghany, Bath, Botetourt, Craig, Floyd, Franklin and 7 more | 59 min |
| Mar 24, 6:03 PM EDT | Mesoscale Discussion | SPC | Amelia, Brunswick, Caroline, Charles City, Chesterfield, Cumberland and 42 more | 2 hr |
| Mar 24, 6:43 PM EDT | Tornado Watch | SPC | Amelia, Amherst, Appomattox, Brunswick, Buckingham, Campbell and 26 more | 4 hr |
| Mar 24, 6:58 PM EDT | Mesoscale Discussion | SPC | Albemarle, Alleghany, Augusta, Bath, Bland, Botetourt and 19 more | 92 min |
| Mar 24, 7:34 PM EDT | Mesoscale Discussion | SPC | Amelia, Appomattox, Brunswick, Buckingham, Campbell, Charles City and 23 more | 116 min |
Nearby
Severe Thunderstorm Watches in Virginia, 2012Severe Thunderstorm Watches in West Virginia, 2012Every severe thunderstorm 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.