Alert archive / West Virginia / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 241
The Storm Prediction Center issued this severe thunderstorm watch at May 21, 2004, 6:35 PM EDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 21, 2004, 6:35 PM EDT (22:35 UTC)
- Expired
- May 21, 2004, 11:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 77 counties
Allegany County, MD, Carroll County, MD, Charles County, MD, Frederick County, MD, Garrett County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Washington County, MD, Gallia County, OH, Meigs County, OH, Arlington County, VA, Augusta County, VA, Bath County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Staunton, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, Loudoun County, VA, Madison County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Stafford County, VA, Warren County, VA, Barbour County, WV, Berkeley County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Harrison County, WV, Jackson County, WV, Jefferson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, Mineral County, WV, Mingo County, WV, Morgan County, WV, Nicholas County, WV, Pendleton County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wirt County, WV, Wood County, WV
The radar
The Charleston,WV radar (KRLX), 145 km from the middle of the area, began a volume at 22:39 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
30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 6:38 PM EDT | Severe Thunderstorm Warning | RLX | Doddridge | 52 min |
| May 21, 6:54 PM EDT | Severe Thunderstorm Warning | RLX | Pleasants, Ritchie | 66 min |
| May 21, 7:17 PM EDT | Severe Thunderstorm Warning | RLX | Wirt | 43 min |
| May 21, 7:25 PM EDT | Severe Thunderstorm Warning | RLX | Harrison, Taylor | 35 min |
| May 21, 7:27 PM EDT | Severe Thunderstorm Warning | RLX | Meigs | 48 min |
| May 21, 7:31 PM EDT | Severe Thunderstorm Warning | PBZ | Preston | 59 min |
| May 21, 7:32 PM EDT | Severe Thunderstorm Warning | RLX | Gilmer, Lewis | 43 min |
| May 21, 7:34 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 56 min |
| May 21, 7:50 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 55 min |
| May 21, 7:52 PM EDT | Severe Thunderstorm Warning | RLX | Barbour, Braxton, Randolph, Upshur | 53 min |
| May 21, 8:07 PM EDT | Severe Thunderstorm Warning | PBZ | Tucker | 53 min |
| May 21, 8:11 PM EDT | Severe Thunderstorm Warning | LWX | Hampshire, Hardy, Morgan | 64 min |
| May 21, 8:18 PM EDT | Severe Thunderstorm Warning | RLX | Webster | 57 min |
| May 21, 8:21 PM EDT | Severe Thunderstorm Warning | LWX | Pendleton | 54 min |
| May 21, 8:24 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 66 min |
| May 21, 8:28 PM EDT | Severe Thunderstorm Warning | RLX | Nicholas | 47 min |
| May 21, 8:31 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, City of Winchester | 59 min |
| May 21, 8:43 PM EDT | Flash Flood Warning | LWX | Allegany | 4 hr |
| May 21, 8:49 PM EDT | Severe Thunderstorm Warning | RLX | Pocahontas | 41 min |
| May 21, 8:53 PM EDT | Severe Thunderstorm Warning | LWX | Rockingham, Shenandoah, City of Harrisonburg | 82 min |
| May 21, 9:04 PM EDT | Severe Thunderstorm Warning | RLX | Fayette | 41 min |
| May 21, 9:06 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Warren | 54 min |
| May 21, 9:07 PM EDT | Tornado Warning | LWX | Berkeley | 38 min |
| May 21, 9:19 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Loudoun | 56 min |
| May 21, 9:33 PM EDT | Severe Thunderstorm Warning | LWX | Page | 27 min |
| May 21, 9:48 PM EDT | Severe Thunderstorm Warning | LWX | Augusta | 42 min |
| May 21, 9:51 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 69 min |
| May 21, 9:53 PM EDT | Flash Flood Warning | LWX | Augusta | 6 hr |
| May 21, 9:59 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, City of Fairfax | 61 min |
| May 21, 10:10 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, City of Alexandria, City of Falls Church | 50 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
Pittsburgh, PA (KPIT), launched 12:00Z, 10.6 hours before the alert went out and 174 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
- 873 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -197 m²/s²
- 0-3 km storm-relative helicity
- -213 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 |
|---|---|---|---|---|
| May 21, 8:34 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Carroll, Charles, Frederick, Howard and 4 more | 86 min |
| May 21, 12:28 PM EDT | Mesoscale Discussion | SPC | Charles, Saint Mary's | 2 hr |
| May 21, 5:31 PM EDT | Mesoscale Discussion | SPC | Allegany, Frederick, Garrett, Washington | 89 min |
| May 20, 10:05 PM EDT | Severe Thunderstorm Watch | SPC | Defiance, Fulton, Lucas, Williams | 5 hr |
| May 21, 2:40 AM EDT | Mesoscale Discussion | SPC | Ashland, Carroll, Columbiana, Coshocton, Crawford, Cuyahoga and 20 more | 65 min |
| May 21, 4:45 AM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Coshocton, Fairfield, Franklin and 12 more | 60 min |
| May 21, 10:40 AM EDT | Mesoscale Discussion | SPC | Allen, Crawford, Cuyahoga, Defiance, Erie, Fulton and 14 more | 2 hr |
| May 21, 1:05 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Ashland, Auglaize, Champaign, Coshocton, Crawford and 32 more | 4 hr |
| May 21, 2:19 PM EDT | Mesoscale Discussion | SPC | Ashland, Ashtabula, Carroll, Columbiana, Crawford, Cuyahoga and 27 more | 116 min |
| May 21, 3:15 PM EDT | Severe Thunderstorm Watch | SPC | Ashtabula, Belmont, Carroll, Columbiana, Cuyahoga, Geauga and 10 more | 6 hr |
| May 21, 4:25 PM EDT | Severe Thunderstorm Watch | SPC | Athens, Auglaize, Champaign, Clark, Clinton, Darke and 21 more | 6 hr |
| May 21, 1:00 PM EDT | Severe Thunderstorm Watch | SPC | Accomack, Albemarle, Amelia, Amherst, Appomattox, Augusta and 68 more | 7 hr |
| May 21, 4:30 PM EDT | Mesoscale Discussion | SPC | Amelia, Brunswick, Charles City, Charlotte, Chesterfield, Cumberland and 38 more | 2 hr |
Nearby
Severe Thunderstorm Watches in West Virginia, 2004Severe Thunderstorm Watches in Virginia, 2004Severe Thunderstorm Watches in Maryland, 2004Every severe thunderstorm watch in 2004
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.