

992 

WWUS20 KWNS 111718

SEL9

SPC WW 111718

KSZ000-NEZ000-112200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 279

NWS STORM PREDICTION CENTER NORMAN OK

1220 PM CDT WED MAY 11 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN KANSAS

       SOUTHEAST NEBRASKA



EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 1220 PM UNTIL 500 PM 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 95

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST

NORTHWEST OF COLUMBUS NEBRASKA TO 65 MILES SOUTHEAST OF WICHITA

KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...CONTINUE...WW 278...



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

ACROSS THE REGION AS UPPER DISTURBANCE AND STRONG WINDS ALOFT ACT ON

INCREASINGLY UNSTABLE AIR MASS. SHEAR WILL INCREASE COINCIDENT WITH

FORCING AND STORM DEVELOPMENT SO A TRANSITION FROM MULTICELLULAR

CONVECTION WITH SOME HAIL AND WIND POTENTIAL TO A SUPERCELL/LINE

SEGMENT CONVECTIVE CHARACTER IS ANTICIPATED WITH TIME.

FURTHERMORE...AS INCREASINGLY SUPPORTIVE CONDITIONS FOR TORNADOES

EVOLVE ALONG FRONTAL ZONE NEAR AND NORTH OF KS/NEB BORDER...SOME

AREAS WITHIN THIS WATCH MAY NEED TO BE PLACED INTO A TORNADO WATCH

LATER TODAY.



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 23035.





...CARBIN

