Alert archive / Virginia / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 58
The Storm Prediction Center issued this severe thunderstorm watch at Mar 1, 2017, 1:13 PM EST for 5 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 1, 2017, 1:13 PM EST (18:13 UTC)
- Expired
- Mar 1, 2017, 4:53 PM EST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 66 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Dorchester County, MD, Kent County, MD, Queen Anne's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA, Accomack County, VA, Amelia County, VA, Caroline County, VA, Charles City County, VA, Chesterfield County, VA, City of Colonial Heights, VA, City of Hopewell, VA, City of Petersburg, VA, City of Richmond, VA, City of Williamsburg, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Hanover County, VA, Henrico County, VA, James City County, VA, King and Queen County, VA, King William County, VA, Lancaster County, VA, Louisa County, VA, Mathews County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Surry County, VA, Westmoreland County, VA
The radar
The Sterling radar (KLWX), 90 km from the middle of the area, began a volume at 18:16 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 1:38 PM EST | Severe Thunderstorm Warning | AKQ | Cumberland, Goochland, Hanover, Louisa, Powhatan | 52 min |
| Mar 1, 2:00 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 45 min |
| Mar 1, 2:07 PM EST | Severe Thunderstorm Warning | AKQ | Caroline, Essex, Northumberland, Richmond, Westmoreland | 38 min |
| Mar 1, 2:09 PM EST | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 51 min |
| Mar 1, 2:09 PM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 51 min |
| Mar 1, 2:21 PM EST | Severe Thunderstorm Warning | AKQ | Essex, Hanover, Henrico, King and Queen, King William, Lancaster and 2 more | 39 min |
| Mar 1, 2:29 PM EST | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 46 min |
| Mar 1, 2:45 PM EST | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 60 min |
| Mar 1, 4:00 PM EST | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 31 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.2 hours before the alert went out and 83 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
- 32 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 1104 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 142 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 |
|---|---|---|---|---|
| Mar 1, 12:50 PM EST | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 55 min |
| Mar 1, 2:50 PM EST | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 55 min |
| Mar 1, 9:44 AM EST | Mesoscale Discussion | SPC | Allegany, Baltimore, Carroll, Charles, Frederick, Garrett and 6 more | 91 min |
| Mar 1, 10:38 AM EST | Severe Thunderstorm Watch | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more | 4 hr |
| Mar 1, 12:25 PM EST | Mesoscale Discussion | SPC | Baltimore, Carroll, Frederick, Howard, Montgomery, Washington and 1 more | 65 min |
| Mar 1, 2:19 AM EST | Mesoscale Discussion | SPC | Cattaraugus, Chautauqua | 86 min |
| Mar 1, 3:56 PM EST | Mesoscale Discussion | SPC | Beaver, Butler, Crawford, Lawrence, Mercer, Venango and 1 more | 2 hr |
| Mar 1, 6:28 AM EST | Mesoscale Discussion | SPC | Dickenson, Lee, Wise | 2 hr |
| Mar 1, 7:47 AM EST | Severe Thunderstorm Watch | SPC | Buchanan, Dickenson, Lee, Russell, Scott, Washington and 3 more | 5 hr |
| Mar 1, 8:28 AM EST | Mesoscale Discussion | SPC | Buchanan, Dickenson, Lee, Russell, Scott, Tazewell and 2 more | 92 min |
| Mar 1, 3:02 PM EST | Severe Thunderstorm Watch | SPC | Halifax, Pittsylvania, City of Danville | 7 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 2017Severe Thunderstorm Watches in New Jersey, 2017Severe Thunderstorm Watches in Maryland, 2017Every severe thunderstorm watch in 2017
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.