WATCHES: Severe Thunderstorm Watch Number 137

WWUS20 KWNS 132300
SEL7
SPC WW 132300
ARZ000-MSZ000-140700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 137
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT FRI APR 13 2007

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

CENTRAL AND SOUTHERN ARKANSAS
NORTHWESTERN MISSISSIPPI

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 600 PM
UNTIL 200 AM 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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTH OF DE
QUEEN ARKANSAS TO 65 MILES NORTHEAST OF GREENVILLE MISSISSIPPI.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 133...WW 134...WW
135...WW 136...

DISCUSSION...ELEVATED TSTMS INTENSIFYING OVER NRN LA ARE EXPECTED TO
EXPAND IN COVERAGE THIS EVENING AS 50-55 KT LLJ DEVELOPS NEWD INTO
THE LOWER MS VALLEY. MUCAPES OF 1000-1500 J/KG COUPLED WITH STRONG
SHEAR THROUGH THE CLOUD BEARING LAYER INDICATE THE POTENTIAL FOR
ELEVATED SUPERCELLS CAPABLE OF LARGE HAIL AND PERHAPS LOCALLY
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 450. MEAN STORM
MOTION VECTOR 24035.

..MEAD/HALES

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