WATCHES: Severe Thunderstorm Watch Number 793

WWUS20 KWNS 202304
SEL3
SPC WW 202304
ARZ000-MOZ000-210500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 793
NWS STORM PREDICTION CENTER NORMAN OK
605 PM CDT SAT AUG 20 2011

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

NORTHERN ARKANSAS
SOUTHERN MISSOURI

EFFECTIVE THIS SATURDAY NIGHT FROM 605 PM UNTIL MIDNIGHT CDT.

HAIL TO 2 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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH
NORTHWEST OF WEST PLAINS MISSOURI TO 40 MILES WEST SOUTHWEST OF
BATESVILLE ARKANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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...SCATTERED INTENSE THUNDERSTORMS HAVE DEVELOPED ACROSS
SOUTHERN MO AND NORTHERN AR. THESE STORMS WILL PERSIST ACROSS THE
WATCH AREA FOR MUCH OF THE EVENING...IN AN ENVIRONMENT CHARACTERIZED
BY MLCAPE VALUES OF 3000-4000 J/KG AND 20-30 KNOTS OF EFFECTIVE
SHEAR. THE STRONGEST CELLS WILL BE CAPABLE OF LARGE HAIL AND
DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27025.

...HART

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