Alert archive / Virginia / Tornado Watches in 2017
Tornado Watch 132
The Storm Prediction Center issued this tornado watch at Apr 6, 2017, 7:06 AM EDT for 4 counties in Maryland; 37 counties in North Carolina; 57 counties in Virginia. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2017, 7:06 AM EDT (11:06 UTC)
- Expired
- Apr 6, 2017, 3:25 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 98 counties
Dorchester County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Alamance County, NC, Bertie County, NC, Camden County, NC, Chatham County, NC, Chowan County, NC, Cumberland County, NC, Currituck County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Pasquotank County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Sampson County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Accomack County, VA, Amelia County, VA, Appomattox 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 Emporia, VA, City of Franklin, 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 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), 74 km from the middle of the area, began a volume at 11:06 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 7:31 AM EDT | Severe Thunderstorm Warning | RAH | Chatham, Durham, Granville, Orange, Wake | 44 min |
| Apr 6, 7:54 AM EDT | Severe Thunderstorm Warning | RAH | Cumberland, Sampson | 38 min |
| Apr 6, 7:55 AM EDT | Severe Thunderstorm Warning | RAH | Vance, Warren | 35 min |
| Apr 6, 8:26 AM EDT | Severe Thunderstorm Warning | RAH | Johnston, Sampson, Wayne, Wilson | 49 min |
| Apr 6, 9:20 AM EDT | Severe Thunderstorm Warning | AKQ | Chesterfield, Henrico, City of Richmond | 25 min |
| Apr 6, 11:52 AM EDT | Severe Thunderstorm Warning | AKQ | Gloucester, James City, King and Queen, Mathews, Middlesex | 38 min |
| Apr 6, 12:04 PM EDT | Severe Thunderstorm Warning | AKQ | Lancaster, Northumberland, Richmond | 41 min |
| Apr 6, 12:14 PM EDT | Severe Thunderstorm Warning | AKQ | Louisa | 16 min |
| Apr 6, 12:24 PM EDT | Severe Thunderstorm Warning | AKQ | Gloucester, Mathews, Middlesex, York | 51 min |
| Apr 6, 12:36 PM EDT | Tornado Warning | AKQ | City of Chesapeake, City of Norfolk, City of Portsmouth, City of Virginia Beach | 24 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 00:00Z, 11.1 hours before the alert went out and 154 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
- 1255 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 311 m²/s²
- 0-3 km storm-relative helicity
- 305 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
420 WWUS20 KWNS 061102 SEL2 SPC WW 061102 NCZ000-VAZ000-CWZ000-061700- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 132 NWS Storm Prediction Center Norman OK 705 AM EDT Thu Apr 6 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Parts of central and eastern North Carolina Southeastern Virginia Coastal Waters * Effective this Thursday morning and afternoon from 705 AM until 100 PM EDT. * Primary threats include... A couple tornadoes possible Scattered damaging wind gusts to 70 mph possible Isolated large hail events to 1 inch in diameter possible SUMMARY...Some increase in thunderstorm coverage/intensity is expected this morning as a strong storm system pivots northeastward over North Carolina and Virginia. Damaging winds should be the main risk with a broken band of storms, though some supercell structures will be possible with an attendant risk for isolated large hail and a couple of tornadoes. The tornado watch area is approximately along and 70 statute miles east and west of a line from 45 miles north northeast of Richmond VA to 25 miles east of Fayetteville NC. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 400. Mean storm motion vector 21050. ...Thompson
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 5:59 AM EDT | Mesoscale Discussion | SPC | Calvert, Charles, Dorchester, Saint Mary's | 91 min |
| Apr 6, 12:18 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 9 more | 57 min |
| Apr 6, 12:45 PM EDT | Severe Thunderstorm Watch | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Cecil, Charles and 9 more | 4 hr |
| Apr 6, 3:12 PM EDT | Mesoscale Discussion | SPC | Cecil, Kent | 63 min |
| Apr 5, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Cabarrus, Catawba, Cleveland, Davie, Gaston and 5 more | 6 hr |
| Apr 6, 12:51 AM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Caswell, Chatham, Davidson, Durham and 15 more | 114 min |
| Apr 6, 2:54 AM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Cabarrus, Davidson, Guilford, Montgomery and 4 more | 96 min |
| Apr 6, 10:38 AM EDT | Mesoscale Discussion | SPC | Bertie, Chowan, Edgecombe, Gates, Greene, Halifax and 8 more | 67 min |
Nearby
Tornado Watches in Virginia, 2017Tornado Watches in North Carolina, 2017Tornado Watches in Maryland, 2017Every tornado 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.