WATCHES: Severe Thunderstorm Watch Number 153

WWUS20 KWNS 210142
SEL3
SPC WW 210142
NEZ000-210700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 153
NWS STORM PREDICTION CENTER NORMAN OK
840 PM CDT FRI APR 20 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHWEST AND CENTRAL NEBRASKA

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 840 PM
UNTIL 200 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 EAST AND WEST OF A LINE FROM 30 MILES NORTH
NORTHEAST OF AINSWORTH NEBRASKA TO 50 MILES SOUTH OF NORTH PLATTE
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 152...

DISCUSSION...ONGOING CLUSTER OF STRONG/SEVERE THUNDERSTORMS OVER
SWRN NEB WILL CONTINUE TO EXPAND/DEVELOP NNEWD ALONG NOSE OF
INCREASING SLY LLJ THIS EVENING. ENVIRONMENT IS CHARACTERIZED BY
VERY STEEP MID LEVEL LAPSE RATES...MODERATE MUCAPE AND MARGINALLY
SUFFICIENT DEEP SHEAR FOR SUPERCELLS. THIS SUPPORTS A CONTINUED
THREAT OF LARGE HAIL AND POSSIBLY AND ISOLATED STRONG/SEVERE WIND
GUST WITH STRONGER...ELEVATED CORES TONIGHT.

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 20025.

..EVANS

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