Alert archive / Virginia / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 377
The Storm Prediction Center issued this severe thunderstorm watch at Jun 30, 2015, 2:22 PM EDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2015, 2:22 PM EDT (18:22 UTC)
- Expired
- Jun 30, 2015, 9:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 98 counties
Allegany County, MD, Calvert County, MD, Charles County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Alleghany County, NC, Ashe County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Arlington 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, Charlotte County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Danville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, 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, Franklin County, VA, Frederick County, VA, Giles County, VA, Grayson County, VA, Greene County, VA, Halifax County, VA, Henry County, VA, Highland County, VA, King George 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, Smyth County, VA, Spotsylvania County, VA, Stafford County, VA, Tazewell 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, Mercer County, WV, Mineral County, WV, Monroe County, WV, Morgan County, WV, Pendleton County, WV, Summers County, WV
The radar
The Roanoke radar (KFCX), 158 km from the middle of the area, began a volume at 18:19 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
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 |
|---|---|---|---|---|
| Jun 30, 4:26 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 19 min |
| Jun 30, 5:02 PM EDT | Severe Thunderstorm Warning | RNK | Charlotte | 28 min |
| Jun 30, 6:26 PM EDT | Severe Thunderstorm Warning | RNK | Caswell, Rockingham | 45 min |
| Jun 30, 8:31 PM EDT | Severe Thunderstorm Warning | LWX | Page, Rockingham, Shenandoah | 19 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, 6.4 hours before the alert went out and 117 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
- 24 J/kg
- Mixed-layer CIN
- -229 J/kg
- Mixed-layer LCL
- 983 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 38 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 |
|---|---|---|---|---|
| Jun 30, 12:31 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Carroll, Cecil, Frederick, Harford and 6 more | 2 hr |
| Jun 30, 12:58 PM EDT | Severe Thunderstorm Watch | SPC | Garrett | 8 hr |
| Jun 30, 1:21 PM EDT | Severe Thunderstorm Watch | SPC | Anne Arundel, Baltimore, Caroline, Carroll, Cecil, Frederick and 7 more | 7 hr |
| Jun 30, 1:38 PM EDT | Mesoscale Discussion | SPC | Charles, Saint Mary's | 3 hr |
| Jun 30, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | Dorchester | 6 hr |
| Jun 30, 3:48 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett, Washington | 117 min |
| Jun 30, 4:15 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 11 more | 2 hr |
| Jun 30, 7:38 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett | 67 min |
| Jun 30, 12:55 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 33 more | 3 hr |
| Jun 30, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 24 more | 7 hr |
| Jun 30, 4:33 PM EDT | Mesoscale Discussion | SPC | Alexander, Avery, Buncombe, Burke, Caldwell, Catawba and 26 more | 117 min |
| Jun 30, 5:43 PM EDT | Severe Thunderstorm Watch | SPC | Bladen, Brunswick, Columbus, New Hanover, Pender, Robeson | 3 hr |
| Jun 30, 7:08 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 21 more | 67 min |
| Jun 30, 7:22 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Brunswick, Chowan, Columbus and 27 more | 83 min |
| Jun 30, 12:03 PM EDT | Mesoscale Discussion | SPC | Brooke, Doddridge, Hancock, Harrison, Jackson, Marion and 9 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 2015Severe Thunderstorm Watches in West Virginia, 2015Severe Thunderstorm Watches in North Carolina, 2015Every severe thunderstorm watch in 2015
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.