Alert archive / Virginia / Severe Thunderstorm Watches in 2000
Severe Thunderstorm Watch 261
The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2000, 3:45 PM EDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2000, 3:45 PM EDT (19:45 UTC)
- Expired
- May 10, 2000, 9:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 86 counties
New Castle County, DE, 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, 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, Talbot County, MD, Salem County, NJ, Albemarle County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington 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 Charlottesville, VA, City of Colonial Heights, VA, City of Danville, VA, City of Emporia, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Hopewell, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Petersburg, VA, City of Richmond, 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, Goochland County, VA, Greene County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Loudoun County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Mecklenburg County, VA, Nelson County, VA, New Kent County, VA, Nottoway County, VA, Orange 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, Spotsylvania County, VA, Stafford County, VA, Sussex County, VA, Warren County, VA, Westmoreland County, VA, Jefferson County, WV
The radar
The Norfolk radar (KAKQ), 130 km from the middle of the area, began a volume at 19:45 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.
Warnings issued inside it
27 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 3:54 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 51 min |
| May 10, 4:00 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 45 min |
| May 10, 4:11 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 49 min |
| May 10, 4:15 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Prince William | 45 min |
| May 10, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | Howard | 44 min |
| May 10, 4:43 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Howard, Montgomery | 47 min |
| May 10, 4:43 PM EDT | Severe Thunderstorm Warning | LWX | City of Baltimore | 47 min |
| May 10, 4:53 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Madison, Orange | 52 min |
| May 10, 4:58 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Prince William, City of Fairfax, City of Falls Church | 47 min |
| May 10, 4:58 PM EDT | Severe Thunderstorm Warning | LWX | City of Manassas, City of Manassas Park | 47 min |
| May 10, 5:06 PM EDT | Tornado Warning | LWX | Baltimore | 24 min |
| May 10, 5:15 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Stafford | 45 min |
| May 10, 5:28 PM EDT | Severe Thunderstorm Warning | AKQ | Louisa | 32 min |
| May 10, 5:33 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 27 min |
| May 10, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Spotsylvania | 40 min |
| May 10, 5:43 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, Fairfax, Prince William, City of Alexandria | 47 min |
| May 10, 5:59 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 46 min |
| May 10, 6:00 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 30 min |
| May 10, 6:11 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 49 min |
| May 10, 6:22 PM EDT | Severe Thunderstorm Warning | LWX | King George | 38 min |
| May 10, 6:33 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 42 min |
| May 10, 6:51 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 39 min |
| May 10, 7:02 PM EDT | Severe Thunderstorm Warning | AKQ | Essex, Richmond, Westmoreland | 33 min |
| May 10, 7:09 PM EDT | Severe Thunderstorm Warning | AKQ | King and Queen, King William | 31 min |
| May 10, 7:47 PM EDT | Severe Thunderstorm Warning | AKQ | King and Queen, Middlesex | 43 min |
| May 10, 7:47 PM EDT | Severe Thunderstorm Warning | AKQ | Lancaster, Northumberland, Richmond | 43 min |
| May 10, 8:17 PM EDT | Severe Thunderstorm Warning | AKQ | Gloucester, King and Queen | 33 min |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.8 hours before the alert went out and 136 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
- 825 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1518 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.5
The text
As transmitted, in the capitals the NWS used until 2016.
623 WWUS9 KMKC 101927 SEL1 SEL1 MKC WW 101922 DCZ000-DEZ000-MDZ000-VAZ000-110100- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 261 STORM PREDICTION CENTER NORMAN OK 322 PM EDT WED MAY 10 2000 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF DISTRICT OF COLUMBIA DELAWARE EASTERN MARYLAND CENTRAL AND EASTERN VIRGINIA EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL 900 PM EDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES EAST OF DANVILLE VIRGINIA TO 40 MILES NORTH NORTHEAST OF BALTIMORE MARYLAND. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. OTHER WATCH INFORMATION... CONTINUE...WW 259...WW 260... DISCUSSION...THUNDERSTORMS WILL INCREASE AND BUILD SOUTHWARD AS UPPER TROUGH AND COLD FRONT APPROACH AXIS OF 2000 TO 3000 J/KG CAPES. APPROACHING 50 KT MID LEVEL SPEED MAX COMBINED WITH STEEP LAPSE RATES WILL PROVIDE POTENTIAL FOR WIDELY SCATTERED HAIL AND DAMAGING WIND EVETNS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 24035. ...ROGASH 394,0745 363,0772 363,0795 394,0773
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 11:15 AM EDT | Severe Thunderstorm Watch | SPC | New Castle | 6 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 2000Severe Thunderstorm Watches in Maryland, 2000Severe Thunderstorm Watches in Delaware, 2000Every severe thunderstorm watch in 2000
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.