

000 

WWUS20 KWNS 250324

SEL7

SPC WW 250324

KSZ000-NEZ000-251100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 227

NWS STORM PREDICTION CENTER NORMAN OK

1020 PM CDT THU APR 24 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL AND NORTHEAST KANSAS

       SOUTH CENTRAL AND SOUTHEAST NEBRASKA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1020 PM

UNTIL 600 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTH

SOUTHWEST OF KEARNEY NEBRASKA TO 55 MILES EAST SOUTHEAST OF

BEATRICE NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...CONTINUE...WW 226...



DISCUSSION...ELEVATED CONVECTION WILL INCREASE ACROSS NE KS/SE NEB

OVERNIGHT ON THE NOSE OF THE DEVELOPING LLJ IN KS.  A FEED OF

MODERATE INSTABILITY /MUCAPE OF 1500-2000 J/KG/ WILL HELP SUSTAIN

SLIGHTLY ELEVATED STORMS WITH A PRIMARY THREAT OF LARGE HAIL.  THERE

WILL ALSO BE SOME POTENTIAL FOR CONVECTION TO GROW INTO A SMALL MCS

OVERNIGHT WITH AN ATTENDANT THREAT FOR DAMAGING WINDS.

ADDITIONALLY...THE LONE SUPERCELL IN NRN KS MAY PERSIST FOR A FEW

HOURS AS IT MOVES INTO AN INCREASINGLY MOIST AIR MASS.  THOUGH AN

ISOLATED TORNADO CANNOT BE RULED OUT...THIS BOUNDARY LAYER AIR MASS

IS ALSO COOL ENOUGH TO SUGGEST THAT ISOLATED VERY LARGE

HAIL/DAMAGING WINDS WILL BE THE MAIN THREATS WITH THIS STORM.



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 26025.





...THOMPSON

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