Alert archive / Virginia / Severe Thunderstorm Watches in 2005
Severe Thunderstorm Watch 804
The Storm Prediction Center issued this severe thunderstorm watch at Sep 20, 2005, 2:00 PM EDT for 4 counties in Maryland; 22 counties in North Carolina; 60 counties in Virginia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 20, 2005, 2:00 PM EDT (18:00 UTC)
- Expired
- Sep 20, 2005, 9:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 86 counties
Saint Mary's County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Alamance County, NC, Bertie County, NC, Caswell County, NC, Chatham County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Hertford County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wilson County, NC, Accomack County, VA, Amelia County, VA, Brunswick County, VA, Buckingham County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Danville, VA, City of Emporia, VA, City of Franklin, VA, City of Fredericksburg, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Suffolk, VA, City of Williamsburg, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Greensville County, VA, Halifax 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, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Spotsylvania County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA
The radar
The Norfolk radar (KAKQ), 95 km from the middle of the area, began a volume at 18:02 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
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 6:17 PM EDT | Severe Thunderstorm Warning | RAH | Person | 34 min |
| Sep 20, 7:00 PM EDT | Severe Thunderstorm Warning | RAH | Guilford | 30 min |
| Sep 20, 7:20 PM EDT | Severe Thunderstorm Warning | RAH | Alamance | 25 min |
| Sep 20, 8:14 PM EDT | Severe Thunderstorm Warning | RAH | Warren | 31 min |
| Sep 20, 8:17 PM EDT | Severe Thunderstorm Warning | RAH | Franklin | 43 min |
| Sep 20, 8:22 PM EDT | Severe Thunderstorm Warning | RAH | Chatham | 53 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
Roanoke, VA (KRNK), launched 12:00Z, 6.0 hours before the alert went out and 139 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
- 14 J/kg
- Mixed-layer CIN
- -264 J/kg
- Mixed-layer LCL
- 1141 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 83 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 |
|---|---|---|---|---|
| Sep 20, 12:39 PM EDT | Mesoscale Discussion | SPC | Charles, Montgomery, Prince George's | 96 min |
| Sep 20, 4:14 PM EDT | Mesoscale Discussion | SPC | Calvert, Caroline, Dorchester, Talbot, Wicomico | 2 hr |
| Sep 20, 6:52 PM EDT | Mesoscale Discussion | SPC | Alamance, Caswell, Chatham, Durham, Edgecombe, Franklin and 17 more | 83 min |
Nearby
Severe Thunderstorm Watches in Virginia, 2005Severe Thunderstorm Watches in North Carolina, 2005Severe Thunderstorm Watches in Maryland, 2005Every severe thunderstorm watch in 2005
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.