

971 

WWUS20 KWNS 232300

SEL7

SPC WW 232300

KSZ000-240600-



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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