Alert archive / Virginia / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 643
The Storm Prediction Center issued this severe thunderstorm watch at Jun 29, 2008, 4:37 PM EDT for 5 states. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 29, 2008, 4:37 PM EDT (20:37 UTC)
- Expired
- Jun 30, 2008, 2:00 AM EDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 151 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Washington County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Accomack County, VA, Albemarle County, VA, Alleghany County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Botetourt County, VA, Brunswick County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Covington, VA, City of Danville, VA, City of Emporia, VA, City of Fairfax, VA, City of Falls Church, VA, City of Franklin, VA, City of Fredericksburg, VA, City of Hampton, VA, City of Harrisonburg, VA, City of Hopewell, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Waynesboro, VA, City of Williamsburg, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Gloucester County, VA, Goochland County, VA, Greene County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Henry County, VA, Highland County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Loudoun County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, Nelson County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Page County, VA, Patrick County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA, Warren County, VA, Westmoreland County, VA, York 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 Sterling radar (KLWX), 67 km from the middle of the area, began a volume at 20:38 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
- 70%
- 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
- 90%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 6:48 PM EDT | Severe Thunderstorm Warning | AKQ | Brunswick, Dinwiddie, Greensville, Sussex | 42 min |
| Jun 29, 7:52 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 53 min |
| Jun 29, 8:22 PM EDT | Severe Thunderstorm Warning | AKQ | Isle of Wight, Southampton, Surry, Sussex | 38 min |
| Jun 29, 9:41 PM EDT | Severe Thunderstorm Warning | AKQ | Isle of Wight, York, City of Hampton, City of Newport News, City of Poquoson, City of Suffolk | 49 min |
| Jun 29, 10:05 PM EDT | Severe Thunderstorm Warning | AKQ | Northampton | 25 min |
| Jun 29, 10:18 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Page, Rappahannock, Rockingham, Shenandoah, Warren | 57 min |
| Jun 29, 10:21 PM EDT | Severe Thunderstorm Warning | AKQ | Accomack | 39 min |
| Jun 29, 10:24 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 51 min |
| Jun 29, 10:30 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Montgomery, Washington | 63 min |
| Jun 29, 10:45 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 75 min |
| Jun 29, 10:56 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 34 min |
| Jun 29, 10:58 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Culpeper, Fauquier, Loudoun, Prince William, Rappahannock and 1 more | 77 min |
| Jun 29, 11:51 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 69 min |
| Jun 30, 12:38 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more | 67 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.6 hours before the alert went out and 69 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
- 278 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 1280 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 0 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 29, 2:04 PM EDT | Mesoscale Discussion | SPC | Allegany, Baltimore, Carroll, Frederick, Garrett, Howard and 2 more | 116 min |
| Jun 29, 12:53 PM EDT | Mesoscale Discussion | SPC | Bergen, Essex, Hudson, Hunterdon, Morris, Passaic and 4 more | 67 min |
| Jun 29, 4:11 PM EDT | Severe Thunderstorm Watch | SPC | Bergen, Burlington, Camden, Essex, Hudson, Hunterdon and 10 more | 7 hr |
| Jun 29, 7:13 PM EDT | Mesoscale Discussion | SPC | Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex and 6 more | 92 min |
| Jun 28, 8:06 PM EDT | Mesoscale Discussion | SPC | Alleghany, Bath, Bland, Buchanan, Craig, Dickenson and 12 more | 54 min |
| Jun 29, 10:46 AM EDT | Mesoscale Discussion | SPC | Brooke, Hancock, Marshall, Ohio | 119 min |
| Jun 29, 12:11 PM EDT | Severe Thunderstorm Watch | SPC | Brooke, Hancock, Marion, Marshall, Monongalia, Ohio and 1 more | 8 hr |
| Jun 29, 4:14 PM EDT | Mesoscale Discussion | SPC | Brooke, Hancock, Marion, Marshall, Monongalia, Ohio and 3 more | 91 min |
Nearby
Severe Thunderstorm Watches in Virginia, 2008Severe Thunderstorm Watches in Maryland, 2008Severe Thunderstorm Watches in West Virginia, 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.