

000 

WWUS20 KWNS 240340

SEL1

SPC WW 240340

COZ000-KSZ000-NEZ000-241100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 171

NWS STORM PREDICTION CENTER NORMAN OK

1040 PM CDT MON APR 23 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1040 PM

UNTIL 600 AM 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 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST OF

BURLINGTON COLORADO TO 25 MILES NORTH NORTHEAST OF HILL CITY

KANSAS.  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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 168. WATCH NUMBER 168 WILL NOT BE IN EFFECT AFTER

1040 PM CDT. CONTINUE...WW 167...WW 170...



DISCUSSION...SUPERCELLS WILL CONTINUE ACROSS WW FOR MUCH OF THE

NIGHT ALONG AND JUST WEST OF INCREASING SLY LLJ.  STORMS SHOULD

REMAIN ROOTED IN AND JUST ABOVE THE BOUNDARY LAYER INVOF SURFACE

WARM FRONT EXPECTED TO REMAIN IN PLACE OVER NWRN KS.  LARGE HAIL AND

ISOLATED TORNADOES... ALONG WITH ISOLATED DAMAGING WINDS...WILL

ACCOMPANY THIS ACTIVITY FOR SEVERAL MORE HOURS.



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

500. MEAN STORM MOTION VECTOR 22025.





...EVANS

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