

238 

WWUS20 KWNS 182025

SEL9

SPC WW 182025

KSZ000-190400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 169

NWS STORM PREDICTION CENTER NORMAN OK

325 PM CDT SAT APR 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL KANSAS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 325 PM UNTIL

1100 PM 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 EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF

RUSSELL KANSAS TO 45 MILES SOUTH OF WICHITA KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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...CLUSTER OF SUPERCELL THUNDERSTORMS OVER WEST-CENTRAL KS

WILL SLOWLY SPREAD EASTWARD INTO WATCH AREA THIS AFTERNOON...WHILE

ISOLATED CELLS FOR AHEAD OF PRIMARY ACTIVITY.  STEEP LAPSE RATES AND

FAVORABLE EFFECTIVE SHEAR WILL PROMOTE SUPERCELLS CAPABLE OF VERY

LARGE HAIL THROUGH THE EVENING.



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 400. MEAN STORM

MOTION VECTOR 22025.





...HART

