Alert archive / Virginia / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 278
The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2017, 4:43 PM EDT for 17 counties in North Carolina; 65 counties in Virginia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2017, 4:43 PM EDT (20:43 UTC)
- Expired
- May 27, 2017, 10:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 82 counties
Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Halifax County, NC, Hertford County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Person County, NC, Vance County, NC, Warren County, NC, Albemarle County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Augusta 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 Charlottesville, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Fredericksburg, VA, City of Hampton, VA, City of Hopewell, VA, City of Lynchburg, 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 Staunton, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Waynesboro, VA, City of Williamsburg, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Greene 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 William County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, Nelson County, VA, New Kent County, VA, Nottoway County, VA, Orange County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Southampton County, VA, Spotsylvania County, VA, Surry County, VA, Sussex County, VA, York County, VA
The radar
The Norfolk radar (KAKQ), 92 km from the middle of the area, began a volume at 20:44 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 4:43 PM EDT | Severe Thunderstorm Warning | AKQ | Amelia, Cumberland, Nottoway, Powhatan, Prince Edward | 47 min |
| May 27, 4:58 PM EDT | Severe Thunderstorm Warning | AKQ | Goochland, Hanover, Henrico, King William, Louisa, City of Richmond | 47 min |
| May 27, 5:22 PM EDT | Severe Thunderstorm Warning | RAH | Granville, Person | 24 min |
| May 27, 5:29 PM EDT | Severe Thunderstorm Warning | AKQ | Amelia, Chesterfield, Cumberland, Dinwiddie, Nottoway, Prince Edward | 46 min |
| May 27, 5:31 PM EDT | Severe Thunderstorm Warning | AKQ | Cumberland, Goochland, Powhatan | 13 min |
| May 27, 5:42 PM EDT | Severe Thunderstorm Warning | AKQ | Hanover, Henrico, New Kent, City of Richmond | 48 min |
| May 27, 5:48 PM EDT | Severe Thunderstorm Warning | AKQ | Caroline, Hanover, Louisa | 42 min |
| May 27, 6:13 PM EDT | Severe Thunderstorm Warning | AKQ | Charles City, Chesterfield, Henrico, Prince George, City of Hopewell, City of Richmond | 47 min |
| May 27, 6:14 PM EDT | Severe Thunderstorm Warning | AKQ | Amelia, Brunswick, Chesterfield, Dinwiddie, Greensville, Nottoway and 4 more | 46 min |
| May 27, 6:28 PM EDT | Severe Thunderstorm Warning | AKQ | Caroline, Goochland, Hanover, Henrico, King William | 47 min |
| May 27, 6:31 PM EDT | Severe Thunderstorm Warning | AKQ | Chesterfield, Henrico, City of Colonial Heights | 29 min |
| May 27, 6:56 PM EDT | Severe Thunderstorm Warning | AKQ | Charles City, Chesterfield, Prince George, Surry, Sussex, City of Hopewell | 49 min |
| May 27, 6:59 PM EDT | Severe Thunderstorm Warning | AKQ | Brunswick, Dinwiddie, Greensville, Southampton, Sussex | 46 min |
| May 27, 7:31 PM EDT | Severe Thunderstorm Warning | AKQ | Charles City, Chesterfield, Henrico, Prince George, City of Colonial Heights, City of Hopewell and 1 more | 44 min |
| May 27, 7:37 PM EDT | Severe Thunderstorm Warning | AKQ | Amelia, Cumberland, Powhatan | 38 min |
| May 27, 8:00 PM EDT | Severe Thunderstorm Warning | AKQ | Isle of Wight, Southampton, Surry, Sussex | 34 min |
| May 27, 8:01 PM EDT | Severe Thunderstorm Warning | AKQ | Gates, Hertford, Northampton | 44 min |
| May 27, 8:09 PM EDT | Severe Thunderstorm Warning | AKQ | Amelia, Charles City, Chesterfield, Cumberland, Dinwiddie, Henrico and 8 more | 36 min |
| May 27, 8:42 PM EDT | Severe Thunderstorm Warning | AKQ | Bertie, Chowan, Gates, Hertford | 48 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, 8.7 hours before the alert went out and 140 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
- -429 J/kg
- Mixed-layer LCL
- 989 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 231 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 |
|---|---|---|---|---|
| May 27, 4:16 PM EDT | Mesoscale Discussion | SPC | Caswell, Granville, Halifax, Northampton, Person, Rockingham and 2 more | 89 min |
| May 27, 6:11 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Burke, Caldwell and 14 more | 64 min |
| May 27, 6:55 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 32 more | 9 hr |
| May 27, 6:57 PM EDT | Mesoscale Discussion | SPC | Bertie, Camden, Chowan, Currituck, Edgecombe, Franklin and 13 more | 93 min |
| May 27, 1:50 PM EDT | Mesoscale Discussion | SPC | Dickenson, Lee, Wise, City of Norton | 85 min |
| May 27, 4:11 PM EDT | Severe Thunderstorm Watch | SPC | Buchanan, Dickenson | 6 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 2017Severe Thunderstorm Watches in North Carolina, 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.