

000 

WWUS20 KWNS 090109

SEL4

SPC WW 090109

KSZ000-OKZ000-090700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 284

NWS STORM PREDICTION CENTER NORMAN OK

810 PM CDT THU MAY 8 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN KANSAS

       NORTHERN OKLAHOMA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 810 PM

UNTIL 200 AM CDT.



HAIL TO 2 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 60 MILES WEST

NORTHWEST OF MEDICINE LODGE KANSAS TO 35 MILES EAST NORTHEAST OF

BARTLESVILLE OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 281. WATCH NUMBER 281 WILL NOT BE IN EFFECT

AFTER 810 PM CDT. CONTINUE...WW 280...WW 282...WW 283...



DISCUSSION...LINEAR MCS IS EXPECTED TO DEVELOP ALONG STRONG COLD

FRONT/OUTFLOW BOUNDARY OVER SWRN KS THIS EVENING AND SPREAD QUICKLY

SEWD ACROSS WW OVERNIGHT ALONG NOSE OF STRENGTHENING SSWLY LLJ.

DAMAGING WINDS AND LARGE HAIL ARE EXPECTED TO ACCOMPANY THESE

STORMS...WHICH SHOULD MOVE INTO SERN KS/NERN OK BEFORE WEAKENING

LATER TONIGHT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29035.





...EVANS

