WATCHES: Tornado Watch Number 171

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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