Severe Thunderstorm Watch 721

Issued

Aug 3, 2011, 9:01 AM CDT (14:01 UTC)

Expired

Aug 3, 2011, 4:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Jackson,KY radar (KJKL), 69 km from the middle of the area, began a volume at 14:02 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.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1841Aug 3, 12:26 PM CDT

620 
WWUS20 KWNS 031401
SEL1
SPC WW 031401
KYZ000-TNZ000-VAZ000-032100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 721
NWS STORM PREDICTION CENTER NORMAN OK
1000 AM EDT WED AUG 3 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

       CENTRAL AND EASTERN KENTUCKY
       NORTHEAST TENNESSEE
       FAR WESTERN VIRGINIA

EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL
500 PM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES EAST
NORTHEAST OF LEXINGTON KENTUCKY TO 70 MILES WEST SOUTHWEST OF
BRISTOL TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...BOWING MCS HAS RECENTLY INTENSIFIED WITH WIND DAMAGE
REPORTED IN LEX.  THE COMBINATION OF ENHANCED INFLOW ON WRN FLANK OF
SYSTEM BY A 40 KT LLJ AND A 40-50 KT REAR-INFLOW JET /PER ILN VAD
OBSERVATIONS/ SHOULD MAINTAIN THE SWD PROPAGATION OF MCS TODAY WITH
A CONTINUED THREAT FOR DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 35030.


...MEAD

Severe Thunderstorm Watches in Kentucky, 2011Severe Thunderstorm Watches in Tennessee, 2011Severe Thunderstorm Watches in Virginia, 2011Every severe thunderstorm watch in 2011

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.