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WWUS20 KWNS 300017

SEL8

SPC WW 300017

IAZ000-KSZ000-NEZ000-300400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 398

NWS STORM PREDICTION CENTER NORMAN OK

715 PM CDT SUN MAY 29 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTHWEST IOWA

       SMALL PART OF NORTH CENTRAL KANSAS

       SOUTHEAST NEBRASKA



EFFECTIVE THIS SUNDAY EVENING FROM 715 PM UNTIL 1100 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES WEST SOUTHWEST OF

CONCORDIA KANSAS TO 25 MILES NORTH NORTHEAST OF OMAHA NEBRASKA.

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 396...WW 397...



DISCUSSION...EXTREME INSTABILITY COUPLED WITH STRONGLY VEERING SHEAR

PROFILES ALONG WARM FRONT SUPPORT POTENTIAL FOR TORNADIC SUPERCELLS.

CINH AND WARM AIR ALOFT HAVE BEEN THE CONCERN...HOWEVER STORMS

CONTINUE TO DEVELOP  ALONG BOUNDARY INDICATING CINH HAS WEAKENED.

WHILE FOCUSED...RAPID DEVELOPMENT OF SUPERCELLS IS BECOMING MORE

LIKELY ALONG WITH THREAT OF VERY LARGE HAIL AND TORNADOES.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

600. MEAN STORM MOTION VECTOR 24035.





...HALES

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