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018 

WWUS20 KWNS 300447

SEL0

SPC WW 300447

IAZ000-KSZ000-MOZ000-NEZ000-301000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 110

NWS STORM PREDICTION CENTER NORMAN OK

1145 PM CDT THU APR 29 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHWEST IOWA

       CENTRAL AND NORTHEAST KANSAS

       EXTREME NORTHWEST MISSOURI

       SOUTHEAST NEBRASKA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1145 PM

UNTIL 500 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM SHENANDOAH IOWA TO

30 MILES WEST OF HUTCHINSON KANSAS.  FOR A COMPLETE DEPICTION OF

THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS

WOU0).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 108. WATCH NUMBER 108 WILL NOT BE IN EFFECT

AFTER 1145 PM CDT. CONTINUE...WW 109...



DISCUSSION...ONGOING BAND OF SEVERE STORMS WILL PERSIST FOR A FEW

MORE HOURS WILL MOVING SLOWLY SEWD IN CONJUNCTION WITH STORM OUTFLOW

AND A SURFACE COLD FRONT.  THE EARLIER SUPERCELL STRUCTURES APPEAR

TO BE WEAKENING AS CONVECTIVE INHIBITION INCREASES IN THE BOUNDARY

LAYER...WHILE CONVECTION IS BEING MAINTAINED BY STRONG INFLOW ABOVE

THE FRONT/COLD POOL ON THE NOSE OF A 70+ KT LLJ.  THUS...THE SEVERE

THREAT APPEARS TO BE TRANSITIONING PRIMARILY TO LARGE HAIL AND

DAMAGING WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24040.





...THOMPSON

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