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WWUS20 KWNS 262358

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SPC WW 262358

KSZ000-MOZ000-270700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 560

NWS STORM PREDICTION CENTER NORMAN OK

655 PM CDT SUN JUN 26 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME NORTHEAST KANSAS

       NORTHWEST INTO EAST CENTRAL MISSOURI



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 655 PM UNTIL

200 AM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTHWEST OF SAINT

JOSEPH MISSOURI TO 75 MILES EAST OF JEFFERSON CITY MISSOURI.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 555...WW 556...WW

557...WW 558...WW 559...



DISCUSSION...THUNDERSTORMS ARE BEGINNING TO DEVELOP ALONG THE

SURFACE WARM FRONT IN NW MO...AND W OF STL WHERE A SMALL OUTFLOW

BOUNDARY INTERSECTS THE FRONT.  A VERY UNSTABLE AIR MASS IS IN PLACE

ALONG AND S OF THE BOUNDARY WHERE MLCAPE IS NEAR 5000 J/KG...AND

EFFECTIVE BULK SHEAR NEAR 50 KT WILL FAVOR SUPERCELLS.

ADDITIONALLY...EFFECTIVE SRH OF 200-400 M2/S2 AND A MOIST BOUNDARY

LAYER WILL BE FAVORABLE FOR TORNADOES WITH ANY DISCRETE STORMS IN

THE NEXT FEW HOURS.  VERY LARGE HAIL WILL ALSO BE POSSIBLE.  LATER

TONIGHT...THE DEVELOPING STORMS COULD EVOLVE INTO ONE OR MORE

CLUSTERS...OR THE BOWING MCS IN ERN NEB COULD DEVELOP SEWD ALONG THE

FRONT...WITH AN ATTENDANT RISK FOR DAMAGING WINDS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

650. MEAN STORM MOTION VECTOR 28025.





...THOMPSON

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