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071 

WWUS20 KWNS 231453

SEL9

SPC WW 231453

ARZ000-LAZ000-TXZ000-232200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 79

NWS STORM PREDICTION CENTER NORMAN OK

955 AM CDT FRI APR 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN ARKANSAS

       MUCH OF NORTHERN LOUISIANA

       PARTS OF NORTHEAST TEXAS



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 955 AM UNTIL 500

PM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTHWEST OF

LONGVIEW TEXAS TO 65 MILES SOUTHEAST OF MONTICELLO ARKANSAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...THUNDERSTORMS ARE INCREASING IN AREA OF LARGE SCALE

ASCENT AND RETURN OF A VERY MOIST UNSTABLE GULF AIR MASS. DEEP LAYER

SHEAR IS FAVORABLE FOR SUPERCELLS AND BY EARLY AFTERNOON TORNADIC

SUPERCELLS WILL BE LIKELY AS STORMS CONTINUE MOVE/DEVELOP E/NE

ACROSS THE WATCH AREA.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24030.





...HALES

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