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WWUS20 KWNS 251541

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ARZ000-KSZ000-MOZ000-252300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 369

NWS STORM PREDICTION CENTER NORMAN OK

1040 AM CDT WED MAY 25 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ARKANSAS

       FAR EASTERN KANSAS

       CENTRAL AND SOUTHERN MISSOURI



EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1040 AM UNTIL

600 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTH SOUTHWEST OF

FLIPPIN ARKANSAS TO 60 MILES NORTH NORTHWEST OF COLUMBIA

MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 367...WW 368...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY LATE THIS MORNING INTO AFTERNOON IN ADVANCE OF POTENT

MIDLEVEL VORTICITY MAXIMUM MOVING OUT OF THE CNTRL PLAINS.  STORMS

WILL LIKELY BE FOCUSED ALONG SURFACE COLD FRONT WITH ADDITIONAL

ACTIVITY POSSIBLE DOWNSTREAM WITHIN OPEN WARM SECTOR.  AMBIENT AIR

MASS IS ALREADY MODERATELY UNSTABLE WITH MLCAPE OF 1000-2500

J/KG...AND FURTHER DESTABILIZATION WILL OCCUR THROUGH THE AFTERNOON.

 WHEN COUPLED WITH DEEP-LAYER SHEAR OF 40-45 KT AND EFFECTIVE SRH OF

200-300 M2/S2...SETUP WILL FAVOR THE DEVELOPMENT OF SUPERCELLS

CAPABLE OF TORNADOES...SOME OF WHICH COULD BE SIGNIFICANT.



AVIATION...TORNADOES AND 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 24035.





...MEAD

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