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807 

WWUS20 KWNS 131003

SEL4

SPC WW 131003

ARZ000-KSZ000-MOZ000-OKZ000-131300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 164

NWS STORM PREDICTION CENTER NORMAN OK

505 AM CDT THU MAY 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       EXTREME SOUTHEAST KANSAS

       SOUTHWEST MISSOURI

       NORTHEAST AND EAST CENTRAL OKLAHOMA



EFFECTIVE THIS THURSDAY MORNING FROM 505 AM UNTIL 800 AM CDT.



HAIL TO 1 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF

MUSKOGEE OKLAHOMA TO 40 MILES SOUTHEAST OF MONETT MISSOURI.  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

SEVERE THUNDERSTORM WATCH NUMBER 163. WATCH NUMBER 163 WILL NOT

BE IN EFFECT AFTER 505 AM CDT. CONTINUE...WW 160...WW 161...WW

162...



DISCUSSION...BOWING MCS CONTINUES TO MOVE RAPIDLY ENEWD ALONG

SLOW-MOVING FRONT/OUTFLOW BOUNDARY ACROSS NE OK INTO SW MO.  THIS

BOUNDARY WILL PROVIDE A FOCUS TO MAINTAIN THE CONVECTION...WHILE

STRONG ENVIRONMENTAL FLOW AND A PERSISTENT REAR-INFLOW SIGNATURE ON

RADAR SUGGESTS THAT THE WIND DAMAGE THREAT WILL PERSIST FOR ANOTHER

FEW HOURS.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 25055.





...THOMPSON

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