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820 

WWUS20 KWNS 152036

SEL4

SPC WW 152036

COZ000-KSZ000-NEZ000-160500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 424

NWS STORM PREDICTION CENTER NORMAN OK

335 PM CDT MON JUN 15 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF EASTERN COLORADO

       PARTS OF NORTH AND WEST KANSAS

       LARGE PART OF SOUTHERN NEBRASKA



EFFECTIVE THIS MONDAY AFTERNOON FROM 335 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 4 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 70 MILES NORTHWEST OF LIMON

COLORADO TO 50 MILES EAST OF HASTINGS NEBRASKA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU4).



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 419...WW 420...WW

421...WW 422...WW 423...



DISCUSSION...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY EWD

ACROSS THE WATCH AREA AS THE AIRMASS HAS BECOME MDTLY UNSTABLE WITH

50-60KT OF EFFECTIVE SHEAR.  SUPERCELLS ACCOMPANIED BY VERY LARGE

HAIL AND POSSIBLE TORNADOES WILL BECOME AN INCREASING THREAT THRU

THE EVENING.  STORMS EXPECTED TO DEVELOP INTO A FORWARD PROPAGATING

SEVERE MCS LATER THIS EVENING WITH INCREASING DAMAGING WIND THREAT.



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

SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 26030.





...HALES

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