WATCHES: Severe Thunderstorm Watch Number 586

WWUS20 KWNS 152302
SEL6
SPC WW 152302
ARZ000-MOZ000-TNZ000-160400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 586
NWS STORM PREDICTION CENTER NORMAN OK
605 PM CDT WED JUL 15 2009

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

NORTHEAST ARKANSAS
THE MISSOURI BOOTHEEL
WESTERN TENNESSEE

EFFECTIVE THIS WEDNESDAY EVENING FROM 605 PM UNTIL 1100 PM CDT.

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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH
SOUTHWEST OF WALNUT RIDGE ARKANSAS TO 45 MILES EAST NORTHEAST OF
JACKSON TENNESSEE. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 585...

DISCUSSION...THE THUNDERSTORM CLUSTER MOVING SEWD FROM MO INTO NE AR
HAS SHOWN SIGNS OF COLD POOL INTENSIFICATION AND ACCELERATION IN THE
PAST HOUR...AND THERE HAVE BEEN RECENT WIND OBSERVATIONS OF 44 KT
WINDS WITH THIS CLUSTER IN NE AR. DESPITE RATHER MODEST FLOW OVER
NE AR/WRN TN...A HOT/MOIST BOUNDARY LAYER AND ASSOCIATED STRONG
INSTABILITY WILL SUPPORT A THREAT FOR DAMAGING DOWNBURST WINDS AND
MARGINALLY SEVERE HAIL THROUGH LATE EVENING.

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 550. MEAN STORM
MOTION VECTOR 30030.

...THOMPSON

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