

000 

WWUS20 KWNS 010203

SEL8

SPC WW 010203

KSZ000-MOZ000-010900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 408

NWS STORM PREDICTION CENTER NORMAN OK

900 PM CDT SAT MAY 31 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST KANSAS

       SOUTHWEST MISSOURI



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 900 PM

UNTIL 400 AM 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 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST OF JOPLIN

MISSOURI TO 65 MILES EAST OF SPRINGFIELD MISSOURI.  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 404...WW 407...



DISCUSSION...STRONG INSTABILITY GRADIENT EXTENDING FROM SRN KS INTO

SRN MO COMBINED WITH EFFECTIVE BULK SHEAR VALUES OF 40-50 KT ARE

EXPECTED TO SUPPORT ADDITIONAL ORGANIZED SEVERE STORMS ALONG AND

NORTH OF A BOUNDARY WHICH EXTENDED ESEWD INTO SRN MO.  STRONG LOW

LEVEL SHEAR ALONG THIS BOUNDARY SUGGESTS THE POTENTIAL FOR

TORNADOES...WHILE STEEP MID LEVEL LAPSE RATES WILL SUPPORT THE

THREAT FOR LARGE HAIL...SOME SIGNIFICANT.  SOME POTENTIAL FOR

UPSCALE GROWTH INTO A SMALL MCS ACROSS THIS REGION OVERNIGHT WITH AN

INCREASING THREAT FOR DAMAGING WINDS.



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 28020.





...PETERS/THOMPSON

