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302 

WWUS20 KWNS 191851

SEL9

SPC WW 191851

KSZ000-200200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 309

NWS STORM PREDICTION CENTER NORMAN OK

145 PM CDT THU MAY 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF KANSAS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 145 PM UNTIL

900 PM 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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHEAST OF HILL

CITY KANSAS TO 25 MILES SOUTHEAST OF MEDICINE LODGE KANSAS.  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 307...WW 308...



DISCUSSION...AIR MASS HAS WARMED SUFFICIENTLY SOUTH OF WARM

FRONT...NEAR A ICT-RSL LINE...AND EAST OF A DRYLINE IN WRN KS FOR

STORMS TO INITIATE. THE STORMS WILL DEVELOP/SPREAD NWD THROUGH THE

AFTERNOON HOURS DUE TO THE STRONG SLY FLOW ALOFT. THE DEEP LAYER

SHEAR AND STRONG INSTABILITY ARE FAVORABLE FOR INTENSE SUPERCELLS...

WITH THE LARGER HAIL NEAR OR BIGGER THAN BASEBALL SIZE. ALSO...THE

MOIST BOUNDARY LAYER AND STRONG LOW LEVEL SHEAR WILL SUPPORT

TORNADOES...ONE OR TWO WHICH COULD BE STRONG. THE TORNADOES ARE MOST

LIKELY NEAR AND NORTH OF THE WARM FRONT WHERE ELY BOUNDARY LAYER

WINDS WILL RESULT IN ENHANCED SHEAR.



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

550. MEAN STORM MOTION VECTOR 21030.





...IMY

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