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WWUS20 KWNS 111720

SEL1

SPC WW 111720

KSZ000-MOZ000-112100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 451

NWS STORM PREDICTION CENTER NORMAN OK

1220 PM CDT SUN JUL 11 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       A SMALL PART OF EAST-CENTRAL KANSAS

       CENTRAL MISSOURI



EFFECTIVE THIS SUNDAY AFTERNOON FROM 1220 PM UNTIL 400 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 30 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH OF OLATHE

KANSAS TO 30 MILES SOUTH OF SAINT LOUIS MISSOURI.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU1).



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 450...



DISCUSSION...SUPERCELLS HAVE EVOLVED ALONG A WNW-ESE ORIENTED

BAROCLINIC ZONE WHERE LOW-LEVEL SHEAR IS BEING MAXIMIZED.  THE

ORIENTATION OF THIS BOUNDARY RELATIVE TO THE OBSERVED STORM MOTIONS

SHOULD ALLOW THE ONGOING ACTIVITY TO RESIDE WITHIN A FAVORABLY

SHEARED AND UNSTABLE ENVIRONMENT FOR THE NEXT SEVERAL HOURS.  AS

SUCH...EXPECT THE THREAT FOR TORNADOES AND LARGE HAIL TO EXIST WITH

ANY MORE SUSTAINED SUPERCELL STRUCTURES.  WITH TIME...ACTIVITY MAY

GROW UPSCALE INTO A CONVECTIVE SYSTEM WITH LARGE HAIL AND DAMAGING

WINDS BECOMING THE PRIMARY HAZARDS.



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 28030.





...MEAD

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