WATCHES: Severe Thunderstorm Watch Number 170

WWUS20 KWNS 240254
SEL0
SPC WW 240254
KSZ000-NEZ000-241100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 170
NWS STORM PREDICTION CENTER NORMAN OK
955 PM CDT MON APR 23 2007

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

NORTH CENTRAL KANSAS
SOUTHWEST AND SOUTH CENTRAL NEBRASKA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 955 PM UNTIL
600 AM CDT.

HAIL TO 2.5 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST
NORTHWEST OF IMPERIAL NEBRASKA TO 45 MILES SOUTH SOUTHEAST OF
HASTINGS NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 165...WW 166...WW
167...WW 168...

DISCUSSION...STRENGTHENING...SLY LLJ WILL MAINTAIN INCREASING ASCENT
NORTH OF SURFACE WARM FRONT EXPECTED TO REMAIN ESTABLISHED ACROSS
NRN KS. IN ADDITION...STEEP MID LEVEL LAPSE RATES AND SUFFICIENT
MOISTURE WILL MAINTAIN AN AXIS OF MODERATE ELEVATED INSTABILITY
ACROSS WW. GIVEN SUFFICIENT DEEP LAYER SHEAR FOR SUPERCELLS...LARGE
HAIL WILL BE PRIMARY THREAT AS ACTIVITY LIKELY REMAINS SLIGHTLY
ELEVATED. ANY STORM NEAR THE WARM FRONT MAY DEVELOP LOW LEVEL
ROTATION TONIGHT.

AVIATION...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 19025.

..EVANS

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