Alert archive / Virginia / Mesoscale Discussions in 2004
Mesoscale Discussion 2189
The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2004, 12:00 PM EDT for Charles County, Maryland; 30 counties in North Carolina; 63 counties in Virginia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 8, 2004, 12:00 PM EDT (16:00 UTC)
- Expired
- Sep 8, 2004, 2:00 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 94 counties
Charles County, MD, Alamance County, NC, Bladen County, NC, Caswell County, NC, Chatham County, NC, Cumberland County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Granville County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Person County, NC, Pitt County, NC, Sampson County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, 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 Franklin, VA, City of Fredericksburg, VA, City of Hopewell, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Petersburg, VA, City of Richmond, VA, City of Waynesboro, 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, 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, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA
The radar
The Raleigh/Durham radar (KRAX), 88 km from the middle of the area, began a volume at 16:01 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Roanoke, VA (KRNK), launched 12:00Z, 4.0 hours before the alert went out and 141 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
- 171 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 539 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 233 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 12:50 PM EDT | Tornado Watch | SPC | Charles, Prince George's | 6 hr |
| Sep 8, 3:39 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Charles, Howard, Montgomery and 3 more | 2 hr |
| Sep 8, 6:40 PM EDT | Tornado Watch | SPC | Allegany, Anne Arundel, Calvert, Carroll, Charles, Frederick and 6 more | 5 hr |
| Sep 7, 10:09 PM EDT | Mesoscale Discussion | SPC | Anson, Bladen, Cabarrus, Cleveland, Columbus, Cumberland and 14 more | 96 min |
| Sep 8, 12:30 AM EDT | Tornado Watch | SPC | Alexander, Anson, Avery, Bladen, Brunswick, Burke and 31 more | 7 hr |
| Sep 8, 3:38 AM EDT | Mesoscale Discussion | SPC | Alexander, Anson, Avery, Bladen, Brunswick, Burke and 31 more | 3 hr |
| Sep 8, 6:50 AM EDT | Tornado Watch | SPC | Alamance, Anson, Bladen, Cabarrus, Caswell, Chatham and 42 more | 7 hr |
| Sep 8, 8:41 AM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Bladen, Cabarrus, Caswell, Chatham and 44 more | 2 hr |
Nearby
Mesoscale Discussions in Virginia, 2004Mesoscale Discussions in North Carolina, 2004Mesoscale Discussions in Maryland, 2004Every mesoscale discussion 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.