

567 

WWUS20 KWNS 091449

SEL7

SPC WW 091449

KSZ000-MOZ000-091900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 7

NWS STORM PREDICTION CENTER NORMAN OK

850 AM CST MON FEB 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN KANSAS

       WESTERN MISSOURI



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 850 AM UNTIL 100

PM CST.



HAIL TO 0.5 INCH 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 40

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF

SAINT JOSEPH MISSOURI TO 30 MILES EAST SOUTHEAST OF JOPLIN

MISSOURI.  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...LINE OF LOW-TOPPED FORCED CONVECTION IS SURGING

NORTHEASTWARD INTO WESTERN MO.  THIS ACTIVITY IS ASSOCIATED WITH A

VERY POWERFUL...NEGATIVELY-TILTED MID LEVEL SHORTWAVE TROUGH AND

VERY STRONG LOW LEVEL WIND FIELDS.  DESPITE VERY WEAK INSTABILITY

AND NO DETECTABLE LIGHTNING ACTIVITY...LEADING EDGE OF CONVECTIVE

LINE WILL POSE A THREAT OF DAMAGING WINDS FOR ANOTHER FEW HOURS.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 24045.





...HART

