Alert archive / Virginia / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 494
The Storm Prediction Center issued this severe thunderstorm watch at Jul 1, 2001, 6:30 PM EDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2001, 6:30 PM EDT (22:30 UTC)
- Expired
- Jul 2, 2001, 12:00 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 40 counties
Kent County, DE, Sussex County, DE, Calvert County, MD, Caroline County, MD, Charles County, MD, Dorchester County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Cape May County, NJ, Accomack County, VA, Amelia County, VA, Caroline County, VA, Chesterfield County, VA, City of Fredericksburg, VA, City of Richmond, VA, Culpeper County, VA, Essex County, VA, Goochland County, VA, Hanover County, VA, Henrico County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Louisa County, VA, Madison County, VA, Middlesex County, VA, New Kent County, VA, Northumberland County, VA, Orange County, VA, Powhatan County, VA, Richmond County, VA, Spotsylvania County, VA, Stafford County, VA, Westmoreland County, VA
The radar
The Sterling radar (KLWX), 95 km from the middle of the area, began a volume at 22:33 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
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 6:33 PM EDT | Severe Thunderstorm Warning | PHI | Talbot | 42 min |
| Jul 1, 6:43 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 47 min |
| Jul 1, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 30 min |
| Jul 1, 9:01 PM EDT | Severe Thunderstorm Warning | LWX | Spotsylvania | 44 min |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.5 hours before the alert went out and 88 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
- 737 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1231 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.2
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 4:30 PM EDT | Severe Thunderstorm Watch | SPC | New Castle | 5 hr |
| Jul 1, 12:00 PM EDT | Severe Thunderstorm Watch | SPC | Camden, Gloucester, Hunterdon, Warren | 6 hr |
| Jul 1, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | Bergen, Essex, Hudson, Middlesex, Morris, Passaic and 3 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 2001Severe Thunderstorm Watches in Maryland, 2001Severe Thunderstorm Watches in Delaware, 2001Every severe thunderstorm watch in 2001
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.