Alert archive / Virginia / Mesoscale Discussions in 2004
Mesoscale Discussion 2190
The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2004, 3:39 PM EDT for 9 counties in Maryland; 14 counties in North Carolina; 67 counties in Virginia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 8, 2004, 3:39 PM EDT (19:39 UTC)
- Expired
- Sep 8, 2004, 5:45 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 90 counties
Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Charles County, MD, City of Baltimore, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Bertie County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Hertford County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Vance County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, Albemarle County, VA, Amelia County, VA, Arlington County, VA, Brunswick 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 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 Hopewell, VA, City of Manassas, VA, City of Manassas Park, VA, City of Newport News, VA, City of Petersburg, VA, City of Poquoson, VA, City of Richmond, VA, City of Suffolk, VA, City of Williamsburg, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Greene County, VA, Greensville County, VA, Hanover County, VA, Henrico 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, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA
The radar
The Norfolk radar (KAKQ), 93 km from the middle of the area, began a volume at 19:42 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.7 hours before the alert went out and 153 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
- 188 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 490 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, 12:00 PM EDT | Mesoscale Discussion | SPC | Charles | 2 hr |
| Sep 8, 12:50 PM EDT | Tornado Watch | SPC | Charles, Prince George's | 6 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.