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765 

WWUS20 KWNS 080038

SEL1

SPC WW 080038

MOZ000-080700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 261

NWS STORM PREDICTION CENTER NORMAN OK

735 PM CDT THU MAY 7 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST MISSOURI



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 735 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 25 MILES WEST OF

SAINT JOSEPH MISSOURI TO 45 MILES SOUTH SOUTHEAST OF KIRKSVILLE

MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 258. WATCH NUMBER 258 WILL NOT BE IN EFFECT

AFTER 735 PM CDT. CONTINUE...WW 259...WW 260...



DISCUSSION...SCTD TSTMS EXPECTED TO CONTINUE FORMING INVOF WEAK W-E

FRONT AND ALONG RELATED OUTFLOW BOUNDARIES ACROSS NRN MO AS MODEST

SWLY LLJ VEERS AND SLIGHTLY STRENGTHENS THROUGH THE EVE.  UPR LVL

FORCING FOR ASCENT EXPECTED TO BE WEAK...SO STORM COVERAGE MAY

REMAIN LIMITED.  BUT ANY SUSTAINED STORMS THAT DO FORM WILL HAVE

POTENTIAL FOR SVR HAIL/WIND GIVEN INCREASING MOISTURE INFLOW WITH

LLJ...AND PROXIMITY OF 50-60 KT WNW MID LVL FLOW.  STORMS IN ERN

PART OF WW MAY MERGE INTO A FORWARD-PROPAGATING MCS WITH EMBEDDED

BOWING SEGMENTS/DMGG WIND.



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.





...CORFIDI

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