Alert archive / Virginia / Tornado Watches in 2013

Tornado Watch 286

June 7, 20134 states

The Storm Prediction Center issued this tornado watch at Jun 7, 2013, 1:00 PM EDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 7, 2013, 1:00 PM EDT (17:00 UTC)
Expired
Jun 7, 2013, 8:03 PM EDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt
All 66 counties

Sussex County, DE, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Beaufort County, NC, Bertie County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Hertford County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Northampton County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Accomack 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 Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Gloucester County, VA, Greensville 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, York County, VA

The radar

The Norfolk radar (KAKQ), 67 km from the middle of the area, began a volume at 17:01 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
60%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
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
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 7, 1:30 PM EDTFlash Flood WarningAKQCharles City, Prince George, City of Hopewell, City of Petersburg3 hr
Jun 7, 1:44 PM EDTFlash Flood WarningAKQCharles City, New Kent3 hr
Jun 7, 3:00 PM EDTFlash Flood WarningAKQCharles City, James City, King and Queen, King William, New Kent, City of Williamsburg3 hr
Jun 7, 4:00 PM EDTFlash Flood WarningRAHDurham, Granville, Halifax, Person, Vance, Wake and 1 more3 hr
Jun 7, 4:52 PM EDTFlash Flood WarningAKQNorthampton5 hr
Jun 7, 5:23 PM EDTSevere Thunderstorm WarningPHISussex52 min
Jun 7, 5:56 PM EDTFlash Flood WarningAKQCharles City, James City, King and Queen, King William, New Kent, City of Williamsburg4 hr
Jun 7, 6:01 PM EDTFlash Flood WarningAKQDinwiddie, Prince George, Surry, Sussex, City of Hopewell, City of Petersburg4 hr
Jun 7, 7:04 PM EDTFlash Flood WarningRAHHalifax, Vance, Warren116 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.0 hours before the alert went out and 137 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 2013-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 45 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°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 2013-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.19395878Sfc1 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
45 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
596 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

100 
WWUS20 KWNS 071703
SEL6  
SPC WW 071703
MDZ000-NCZ000-VAZ000-CWZ000-080000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 286
NWS STORM PREDICTION CENTER NORMAN OK
100 PM EDT FRI JUN 7 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTHERN MARYLAND
  EASTERN NORTH CAROLINA
  EASTERN VIRGINIA
  COASTAL WATERS

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 100 PM UNTIL
  800 PM EDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL TORNADOES LIKELY
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 115 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES EAST NORTHEAST OF
NORFOLK VIRGINIA TO 55 MILES NORTHWEST OF NEW BERN NORTH
CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 285. WATCH NUMBER 285 WILL NOT BE IN EFFECT AFTER
100 PM EDT. 

DISCUSSION...SHOWERS/TSTMS WITH A POTENTIAL FOR LOW-LVL ROTATION
EXPECTED TO PERSIST N AND E OF TS ANDREA AS THAT SYSTEM CONTINUES
NEWD THROUGH THIS EVE. THE STRONGEST LOW-LVL SPEED AND DIRECTIONAL
SHEAR...AND GREATEST RISK FOR TORNADOES...SHOULD FOCUS ALONG SW-NE
FRONTAL ZONE ATTM EXTENDING FROM N OF RAH THROUGH SE VA TO NEAR SBY.
SOME RISK FOR DMGG WIND AND PERHAPS A TORNADO OR TWO ALSO WILL EXIST
WITH CONVECTION/POSSIBLE STORMS FORMING ALONG S-N ORIENTED
CONFLUENCE BANDS E OF CIRCULATION CENTER...WHERE DIRECTIONAL SHEAR
IS WEAKER BUT SFC HEATING WILL BE MAXIMIZED.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 20035.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 7, 3:32 PM EDTMesoscale DiscussionSPCSussex58 min
Jun 7, 7:27 PM EDTMesoscale DiscussionSPCSussex3 hr
Jun 7, 6:40 PM EDTMesoscale DiscussionSPCSomerset, Wicomico2 hr
Jun 7, 12:49 AM EDTMesoscale DiscussionSPCBrunswick, New Hanover56 min
Jun 7, 3:34 AM EDTMesoscale DiscussionSPCBeaufort, Carteret, Craven, Dare, Hyde, Jones and 4 more2 hr
Jun 7, 5:37 AM EDTTornado WatchSPCBeaufort, Bertie, Camden, Carteret, Chowan, Craven and 23 more7 hr
Jun 7, 8:35 AM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Carteret, Chowan, Craven and 23 more85 min
Jun 7, 11:26 AM EDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Camden, Carteret, Chowan and 22 more64 min

Nearby

Tornado Watches in Virginia, 2013Tornado Watches in North Carolina, 2013Tornado Watches in Maryland, 2013Every tornado watch in 2013

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.