Alert archive / Virginia / Tornado Watches in 1999
Tornado Watch 670
The Storm Prediction Center issued this tornado watch at Sep 5, 1999, 8:00 AM EDT for 11 counties in Maryland; 56 counties in Virginia; Jefferson County, West Virginia. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 1999, 8:00 AM EDT (12:00 UTC)
- Expired
- Sep 5, 1999, 4:00 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
All 68 counties
Anne Arundel County, MD, Calvert County, MD, Charles County, MD, City of Baltimore, 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, Talbot County, MD, Albemarle County, VA, Amelia County, VA, Appomattox County, VA, Arlington County, VA, Buckingham County, VA, Caroline County, VA, Charles City County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Colonial Heights, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Hopewell, VA, City of Manassas, VA, City of Manassas Park, VA, City of Petersburg, VA, City of Richmond, VA, City of Williamsburg, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Cumberland County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Frederick County, VA, Goochland County, VA, Greene County, VA, Hanover County, VA, Henrico County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Middlesex County, VA, New Kent County, VA, Nottoway County, VA, Orange County, VA, Page County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Warren County, VA, Westmoreland County, VA, Jefferson County, WV
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 8:44 AM EDT | Flash Flood Warning | LWX | Albemarle, Nelson, City of Charlottesville | 3 hr |
The nearest sounding before it
Roanoke, VA (KRNK), launched 12:00Z, 0.0 hours before the alert went out and 175 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 718 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 12:00 AM EDT | Tornado Watch | SPC | Saint Mary's, Somerset, Worcester | 8 hr |
| Sep 5, 4:00 PM EDT | Tornado Watch | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 12 more | 6 hr |
Nearby
Tornado Watches in Virginia, 1999Tornado Watches in Maryland, 1999Tornado Watches in West Virginia, 1999Every tornado watch in 1999
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.