Alert archive / Virginia / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 92
The Storm Prediction Center issued this severe thunderstorm watch at May 14, 2018, 6:11 PM EDT for 4 counties in Maryland; 60 counties in Virginia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 14, 2018, 6:11 PM EDT (22:11 UTC)
- Expired
- May 14, 2018, 10:35 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 64 counties
Dorchester County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Accomack County, VA, Amelia County, VA, Amherst County, VA, Appomattox 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 Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, 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 Suffolk, VA, City of Virginia Beach, 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 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, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA
The radar
The Norfolk radar (KAKQ), 85 km from the middle of the area, began a volume at 22:14 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
- 70%
- 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
- 90%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 6:18 PM EDT | Severe Thunderstorm Warning | AKQ | Fluvanna, Goochland, Louisa | 42 min |
| May 14, 6:23 PM EDT | Severe Thunderstorm Warning | RNK | Amherst, Rockbridge | 67 min |
| May 14, 7:02 PM EDT | Severe Thunderstorm Warning | AKQ | Caroline, Fluvanna, Goochland, Hanover, Louisa | 43 min |
| May 14, 7:10 PM EDT | Severe Thunderstorm Warning | AKQ | Caroline, Essex, King and Queen, Richmond, Westmoreland | 35 min |
| May 14, 7:30 PM EDT | Severe Thunderstorm Warning | AKQ | Amelia, Caroline, Chesterfield, Cumberland, Essex, Goochland and 7 more | 45 min |
| May 14, 7:33 PM EDT | Severe Thunderstorm Warning | AKQ | Essex, Westmoreland | 27 min |
| May 14, 7:43 PM EDT | Severe Thunderstorm Warning | AKQ | Essex, Lancaster, Middlesex, Northumberland, Richmond, Westmoreland | 47 min |
| May 14, 7:47 PM EDT | Severe Thunderstorm Warning | AKQ | Charles City, Chesterfield, Dinwiddie, Essex, Gloucester, Hanover and 13 more | 43 min |
| May 14, 8:11 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 34 min |
| May 14, 8:15 PM EDT | Severe Thunderstorm Warning | AKQ | Charles City, Chesterfield, Dinwiddie, Gloucester, James City, King and Queen and 12 more | 45 min |
| May 14, 8:42 PM EDT | Severe Thunderstorm Warning | AKQ | Isle of Wight, Southampton, Surry, Sussex, York, City of Hampton and 2 more | 48 min |
| May 14, 9:08 PM EDT | Severe Thunderstorm Warning | AKQ | Isle of Wight, City of Chesapeake, City of Norfolk, City of Portsmouth, City of Suffolk, City of Virginia Beach | 37 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, 10.2 hours before the alert went out and 157 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 828 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 138 m²/s²
- 0-3 km storm-relative helicity
- 136 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 14, 11:56 AM EDT | Mesoscale Discussion | SPC | Allegany, Carroll, Frederick, Garrett, Howard, Montgomery and 1 more | 64 min |
| May 14, 12:29 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 9 more | 9 hr |
| May 14, 3:26 PM EDT | Mesoscale Discussion | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 10 more | 2 hr |
| May 14, 5:37 PM EDT | Mesoscale Discussion | SPC | Somerset | 53 min |
| May 14, 7:22 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Calvert, Charles, Howard, Prince George's, Saint Mary's and 1 more | 53 min |
Nearby
Severe Thunderstorm Watches in Virginia, 2018Severe Thunderstorm Watches in Maryland, 2018Every severe thunderstorm watch in 2018
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.