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000 

WWUS20 KWNS 180631

SEL8

SPC WW 180631

ARZ000-MOZ000-MSZ000-TNZ000-181400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 718

NWS STORM PREDICTION CENTER NORMAN OK

130 AM CDT THU OCT 18 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN ARKANSAS

       THE MISSOURI BOOTHEEL

       NORTHERN MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS THURSDAY MORNING FROM 130 AM UNTIL 900 AM CDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

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



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHEAST OF

DYERSBURG TENNESSEE TO 25 MILES SOUTHWEST OF OXFORD MISSISSIPPI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 715...WW 716...WW 717...



DISCUSSION...NE AR SQLN IS ON LEADING EDGE OF ASCENT ASSOCIATED WITH

SRN PART OF POTENT NEGATIVE TILT SHORTWAVE TROUGH OVER ERN KS.  VERY

STRONG DEEP SHEAR...300+ M2/S2 0-1 KM SRH /GIVEN OBSERVED STORM

MOTIONS/ AND RICH BOUNDARY LYR MOISTURE MOVING N THROUGH THE MS

DELTA SUGGEST POTENTIAL FOR SPIN-UP TORNADOES...IN ADDITION TO

DAMAGING WIND... DESPITE QUASI-LINEAR STORM MODE.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 22040.





...CORFIDI

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