

000 

WWUS20 KWNS 101342

SEL9

SPC WW 101342

ARZ000-LAZ000-102100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 189

NWS STORM PREDICTION CENTER NORMAN OK

845 AM CDT THU APR 10 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN AND EASTERN ARKANSAS

       MUCH OF NORTHERN LOUISIANA



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 845 AM UNTIL

400 PM CDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES EAST NORTHEAST OF

LITTLE ROCK ARKANSAS TO 30 MILES EAST SOUTHEAST OF SHREVEPORT

LOUISIANA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 185...WW 186...WW

187...WW 188...



DISCUSSION...SQUALL LINE NERN TX/SWRN AR WILL MOVE RAPIDLY NEWD

THROUGH A VERY FAVORABLE SHEAR AND INSTABILITY ENVIRONMENT FOR

TORNADIC SUPERCELL DEVELOPMENT.  DAMAGING WINDS ALONG WITH THE

TORNADO THREAT WILL ACCOMPANY THE LINE AS IT CROSSES WATCH AREA FROM

W TO E.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 23045.





...HALES

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