Alert archive / Virginia / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 739
The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 2008, 3:25 PM EDT for 4 states. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2008, 3:25 PM EDT (19:25 UTC)
- Expired
- Jul 23, 2008, 11:00 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 132 counties
Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Washington County, MD, Alamance County, NC, Alexander County, NC, Alleghany County, NC, Anson County, NC, Ashe County, NC, Avery County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Caswell County, NC, Catawba County, NC, Chatham County, NC, Davidson County, NC, Davie County, NC, Durham County, NC, Forsyth County, NC, Franklin County, NC, Gaston County, NC, Granville County, NC, Guilford County, NC, Iredell County, NC, Lee County, NC, Lincoln County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Rockingham County, NC, Rowan County, NC, Stanly County, NC, Stokes County, NC, Surry County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren 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, 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, 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, Warren County, VA, Wythe County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV
The radar
The Roanoke radar (KFCX), 155 km from the middle of the area, began a volume at 19:28 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
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
49 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 3:32 PM EDT | Severe Thunderstorm Warning | RNK | Botetourt, Craig | 58 min |
| Jul 23, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 46 min |
| Jul 23, 3:55 PM EDT | Severe Thunderstorm Warning | RNK | Floyd, Franklin, Montgomery, Pulaski, Roanoke, City of Radford and 2 more | 65 min |
| Jul 23, 4:03 PM EDT | Severe Thunderstorm Warning | RNK | Botetourt, Craig, Montgomery, Roanoke | 47 min |
| Jul 23, 4:07 PM EDT | Severe Thunderstorm Warning | RAH | Franklin, Granville, Wake | 38 min |
| Jul 23, 4:11 PM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Surry | 48 min |
| Jul 23, 4:32 PM EDT | Severe Thunderstorm Warning | RAH | Franklin, Vance, Warren | 58 min |
| Jul 23, 4:45 PM EDT | Severe Thunderstorm Warning | GSP | Cleveland, Gaston, Lincoln | 60 min |
| Jul 23, 4:48 PM EDT | Severe Thunderstorm Warning | RNK | Bedford, Botetourt, Franklin, Roanoke, City of Roanoke | 57 min |
| Jul 23, 5:03 PM EDT | Severe Thunderstorm Warning | RNK | Franklin, Henry, Patrick | 57 min |
| Jul 23, 5:32 PM EDT | Severe Thunderstorm Warning | RNK | Bedford, Campbell, Franklin, Pittsylvania | 58 min |
| Jul 23, 5:35 PM EDT | Severe Thunderstorm Warning | RNK | Stokes, Surry, Yadkin | 55 min |
| Jul 23, 5:41 PM EDT | Severe Thunderstorm Warning | GSP | Burke | 64 min |
| Jul 23, 5:41 PM EDT | Severe Thunderstorm Warning | RNK | Amherst, Appomattox, Bedford, Campbell, City of Lynchburg | 64 min |
| Jul 23, 5:43 PM EDT | Severe Thunderstorm Warning | RNK | Wilkes, Yadkin | 44 min |
| Jul 23, 5:50 PM EDT | Severe Thunderstorm Warning | RNK | Rockingham, Stokes | 55 min |
| Jul 23, 5:59 PM EDT | Severe Thunderstorm Warning | RNK | Appomattox, Campbell, Charlotte, Halifax, Pittsylvania | 61 min |
| Jul 23, 6:04 PM EDT | Severe Thunderstorm Warning | RAH | Forsyth | 46 min |
| Jul 23, 6:07 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Madison, Page, Rappahannock | 38 min |
| Jul 23, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 51 min |
| Jul 23, 6:16 PM EDT | Severe Thunderstorm Warning | GSP | Burke, Caldwell, Catawba, Lincoln | 46 min |
| Jul 23, 6:19 PM EDT | Tornado Warning | LWX | Rappahannock | 26 min |
| Jul 23, 6:39 PM EDT | Severe Thunderstorm Warning | RNK | Charlotte, Halifax | 66 min |
| Jul 23, 6:43 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, Madison, Orange, Rappahannock | 62 min |
| Jul 23, 6:47 PM EDT | Severe Thunderstorm Warning | RNK | Campbell, Charlotte, Halifax | 58 min |
| Jul 23, 6:53 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 52 min |
| Jul 23, 6:55 PM EDT | Severe Thunderstorm Warning | RNK | Halifax, Pittsylvania, City of Danville | 65 min |
| Jul 23, 7:14 PM EDT | Severe Thunderstorm Warning | GSP | Davie, Iredell, Rowan | 61 min |
| Jul 23, 7:20 PM EDT | Severe Thunderstorm Warning | RNK | Caswell, Rockingham | 55 min |
| Jul 23, 7:25 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Loudoun, Prince William, City of Fairfax, City of Manassas, City of Manassas Park | 80 min |
| Jul 23, 7:32 PM EDT | Tornado Warning | LWX | Fairfax, Fauquier, Loudoun, Prince William, City of Manassas, City of Manassas Park | 43 min |
| Jul 23, 7:33 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 42 min |
| Jul 23, 7:39 PM EDT | Severe Thunderstorm Warning | RNK | Charlotte, Halifax | 55 min |
| Jul 23, 7:46 PM EDT | Flash Flood Warning | RNK | Charlotte | 5 hr |
| Jul 23, 7:50 PM EDT | Severe Thunderstorm Warning | RAH | Alamance, Guilford | 40 min |
| Jul 23, 7:52 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 38 min |
| Jul 23, 8:10 PM EDT | Severe Thunderstorm Warning | GSP | Mecklenburg | 65 min |
| Jul 23, 8:21 PM EDT | Severe Thunderstorm Warning | LWX | Spotsylvania, Stafford | 39 min |
| Jul 23, 8:29 PM EDT | Severe Thunderstorm Warning | RAH | Orange | 38 min |
| Jul 23, 8:34 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 41 min |
| Jul 23, 8:34 PM EDT | Severe Thunderstorm Warning | GSP | Union | 56 min |
| Jul 23, 8:36 PM EDT | Flash Flood Warning | LWX | Prince George's | 4 hr |
| Jul 23, 8:38 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 52 min |
| Jul 23, 8:46 PM EDT | Severe Thunderstorm Warning | GSP | Cabarrus, Mecklenburg, Union | 59 min |
| Jul 23, 8:48 PM EDT | Flash Flood Warning | LWX | Baltimore, City of Baltimore | 4 hr |
| Jul 23, 8:49 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Montgomery, Moore, Randolph | 41 min |
| Jul 23, 8:51 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 39 min |
| Jul 23, 9:42 PM EDT | Severe Thunderstorm Warning | RAH | Anson, Stanly | 22 min |
| Jul 23, 10:19 PM EDT | Flash Flood Warning | LWX | Harford | 4 hr |
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, 7.4 hours before the alert went out and 93 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
- 217 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 800 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -35 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 12:33 PM EDT | Mesoscale Discussion | SPC | Caroline, Dorchester, Queen Anne's, Saint Mary's, Somerset, Talbot and 2 more | 57 min |
| Jul 23, 12:44 PM EDT | Severe Thunderstorm Watch | SPC | Dorchester, Somerset, Wicomico, Worcester | 7 hr |
| Jul 23, 1:28 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett | 62 min |
| Jul 23, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | Caroline, Cecil, Kent, Queen Anne's, Talbot | 7 hr |
| Jul 23, 3:54 PM EDT | Mesoscale Discussion | SPC | Dorchester, Wicomico, Worcester | 66 min |
| Jul 23, 7:28 PM EDT | Mesoscale Discussion | SPC | Dorchester, Somerset, Wicomico, Worcester | 62 min |
| Jul 23, 10:38 AM EDT | Mesoscale Discussion | SPC | Alamance, Cabarrus, Caswell, Chatham, Durham, Franklin and 12 more | 67 min |
Nearby
Severe Thunderstorm Watches in Virginia, 2008Severe Thunderstorm Watches in North Carolina, 2008Severe Thunderstorm Watches in Maryland, 2008Every severe thunderstorm watch in 2008
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.