SPC Severe Thunderstorm Watch 587

WW 587 SEVERE TSTM KS 232300Z – 240600Z

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 587
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT THU AUG 23 2012

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

       WESTERN KANSAS

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 600 PM
UNTIL 100 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 65
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH
NORTHWEST OF HILL CITY KANSAS TO 20 MILES SOUTHEAST OF GARDEN
CITY KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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.

DISCUSSION...STORMS ARE GRADUALLY INCREASING OVER WRN/NORTH CENTRAL
KS NEAR A LOW LEVEL CONVERGENCE ZONE EXTENDING FROM A LOW OVER SERN
CO NEWD INTO NWRN KS.  THE AIR MASS SOUTH OF THE FRONT IS WARM AND
UNSTABLE WITH MLCAPE AROUND 1500 J/KG.  ALTHOUGH MID LEVEL WINDS ARE
MODEST AT BEST...STRONG DIRECTIONAL SHEAR WITH HEIGHT WILL ENHANCE
STORM ORGANIZATION AND INTENSITY WITH ORGANIZED MULTICELL STRUCTURES
LIKELY.  AN INCREASE STORM COVERAGE IS EXPECTED THIS EVENING AS A
LOW LEVEL JET DEVELOPS INTO WRN KS AND THIS MAY AID IN STORM
MAINTENANCE INTO THE OVERNIGHT HOURS.  LARGE HAIL AND STRONG WIND
GUSTS WILL BE POSSIBLE WITH STRONGER CELLS...AND SLOW STORM MOTION
SUGGEST ADDITIONAL THREAT OF LOCALIZED HEAVY RAIN.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 55
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 28015.


...WEISS

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