

000 

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

