

000 

WWUS20 KWNS 310955

SEL0

SPC WW 310955

KSZ000-OKZ000-311700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 400

NWS STORM PREDICTION CENTER NORMAN OK

455 AM CDT SAT MAY 31 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN AND CENTRAL KANSAS

       NORTHERN OKLAHOMA



EFFECTIVE THIS SATURDAY MORNING FROM 455 AM UNTIL NOON 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES NORTHWEST

OF MEDICINE LODGE KANSAS TO 50 MILES SOUTHEAST OF CHANUTE KANSAS.

 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 399...



DISCUSSION...TSTMS NOW FORMING IN STRENGTHENING WAA ZONE ALONG AND N

OF STALLING FRONT EXPECTED TO PERSIST AND POSSIBLY INCREASE IN

NUMBER/INTENSITY LATER THIS MORNING AS MOIST SWLY LLJ CONTINUES TO

IMPINGE ON REGION.  THERMODYNAMIC/KINEMATIC ENVIRONMENT APPEARS

FAVORABLE FOR SUSTAINED STORMS/POSSIBLE SUPERCELLS...WITH LARGE HAIL

AND LCLY DMGG WIND THE MAIN SVR THREATS /REF MCD 1109/.



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 29025.





...CORFIDI

