Alert archive / Virginia / Tornado Watches in 2021

Tornado Watch 350

July 8, 20216 counties in Maryland; 17 counties in North Carolina; 42 counties in Virginia

The Storm Prediction Center issued this tornado watch at Jul 8, 2021, 1:50 PM EDT for 6 counties in Maryland; 17 counties in North Carolina; 42 counties in Virginia. It was in force for 11 hr.

The area

The outline as issued.

The facts

Issued
Jul 8, 2021, 1:50 PM EDT (17:50 UTC)
Expired
Jul 9, 2021, 1:00 AM EDT
In force
11 hr
Issued by
the Storm Prediction Center
Strongest gust expected
60 kt
All 65 counties

Calvert County, MD, Dorchester County, MD, Saint Mary's County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Beaufort County, NC, Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Dare County, NC, Gates County, NC, Halifax County, NC, Hertford County, NC, Hyde County, NC, Martin County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Accomack County, VA, Caroline County, VA, Charles City 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, Dinwiddie County, VA, Essex County, VA, Gloucester County, VA, Greensville 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, Mathews County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland 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), 92 km from the middle of the area, began a volume at 17:54 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
50%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
30%

Warnings issued inside it

23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 8, 2:44 PM EDTTornado WarningMHXHyde31 min
Jul 8, 3:09 PM EDTTornado WarningMHXHyde, Tyrrell, Washington36 min
Jul 8, 3:39 PM EDTTornado WarningAKQBertie, Gates, Hertford36 min
Jul 8, 3:55 PM EDTTornado WarningAKQHertford, Northampton35 min
Jul 8, 4:00 PM EDTTornado WarningAKQGates, Hertford30 min
Jul 8, 5:20 PM EDTFlash Flood WarningAKQNorthampton4 hr
Jul 8, 5:39 PM EDTTornado WarningAKQCamden, Gates36 min
Jul 8, 6:17 PM EDTTornado WarningAKQIsle of Wight, Surry, City of Newport News, City of Suffolk14 min
Jul 8, 6:29 PM EDTTornado WarningMHXBeaufort, Hyde31 min
Jul 8, 6:43 PM EDTTornado WarningAKQGates32 min
Jul 8, 7:06 PM EDTTornado WarningAKQIsle of Wight, City of Suffolk24 min
Jul 8, 7:09 PM EDTTornado WarningAKQCamden, Currituck, Pasquotank, Perquimans36 min
Jul 8, 7:49 PM EDTFlash Flood Warning Considerable damage threatAKQCharles City, Chesterfield, Dinwiddie, Henrico, Prince George, City of Colonial Heights and 2 more6 hr
Jul 8, 8:07 PM EDTTornado WarningAKQCity of Chesapeake, City of Norfolk, City of Virginia Beach23 min
Jul 8, 8:25 PM EDTTornado WarningAKQCurrituck35 min
Jul 8, 8:49 PM EDTFlash Flood WarningAKQCharles City, Henrico, James City, King William, New Kent, Prince George5 hr
Jul 8, 10:31 PM EDTTornado WarningLWXSaint Mary's29 min
Jul 8, 11:13 PM EDTFlash Flood Warning Considerable damage threatLWXSaint Mary's76 min
Jul 8, 11:13 PM EDTTornado WarningLWXCalvert, Saint Mary's17 min
Jul 8, 11:48 PM EDTTornado WarningAKQWicomico, Worcester27 min
Jul 9, 12:04 AM EDTTornado WarningAKQWorcester26 min
Jul 9, 12:05 AM EDTTornado WarningAKQWicomico25 min
Jul 9, 12:25 AM EDTFlash Flood WarningAKQDorchester3 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.8 hours before the alert went out and 97 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.

Skew-T log-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2021-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 654 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2021-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
654 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
1222 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
37 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

890 
WWUS20 KWNS 081747
SEL0  
SPC WW 081747
MDZ000-NCZ000-VAZ000-CWZ000-090300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 350
NWS Storm Prediction Center Norman OK
150 PM EDT Thu Jul 8 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Eastern Maryland
  Eastern North Carolina
  Eastern Virginia
  Coastal Waters

* Effective this Thursday afternoon and evening from 150 PM until
  1100 PM EDT.

* Primary threats include...
  A few tornadoes possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...A moist air mass and strong low-level winds associated
with Elsa will support the possibility of supercells capable of
brief tornadoes this afternoon and evening as Elsa continues
north-northeastward.

The tornado watch area is approximately along and 65 statute miles
east and west of a line from 25 miles east northeast of Patuxent
River MD to 65 miles south southwest of Elizabeth City NC. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 349...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 15025.

...Guyer

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 8, 6:48 PM EDTMesoscale DiscussionSPCSomerset, Wicomico, Worcester117 min
Jul 8, 1:38 AM EDTMesoscale DiscussionSPCBladen, Brunswick, Columbus, New Hanover, Pender, Robeson2 hr
Jul 8, 2:01 AM EDTTornado WatchSPCBladen, Brunswick, Columbus, New Hanover, Pender7 hr
Jul 8, 7:09 AM EDTMesoscale DiscussionSPCBladen, Brunswick, Carteret, Columbus, Craven, Duplin and 11 more2 hr
Jul 8, 8:35 AM EDTTornado WatchSPCBeaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 23 more6 hr
Jul 8, 12:11 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Carteret, Chowan, Craven and 23 more2 hr
Jul 8, 4:08 PM EDTMesoscale DiscussionSPCCamden, Chowan, Currituck, Gates, Hertford, Pasquotank and 2 more2 hr

Nearby

Tornado Watches in Virginia, 2021Tornado Watches in North Carolina, 2021Tornado Watches in Maryland, 2021Every tornado watch in 2021

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.