

385 

WWUS20 KWNS 121940

SEL2

SPC WW 121940

KSZ000-NEZ000-130300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 292

NWS STORM PREDICTION CENTER NORMAN OK

240 PM CDT THU MAY 12 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN KANSAS

       SOUTHEAST NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 3 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 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTHWEST OF

KEARNEY NEBRASKA TO 35 MILES EAST NORTHEAST OF LINCOLN NEBRASKA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 288...WW 289...WW

290...WW 291...



DISCUSSION...TSTMS SHOULD CONTINUE TO INCREASE WITHIN VICINITY OF

COLD CORE LOW AS IT PROGRESSES SLOWLY EAST ACROSS NEB/KS BORDER AREA

THIS AFTERNOON. MODEST AMBIENT VORTICITY ASSOCIATED WITH THE LOW AND

LOW LEVEL ENHANCEMENT TO SR SHEAR PROFILES DUE TO BACKED SURFACE

FLOW SHOULD PROVIDE A FAVORABLE KINEMATIC SET UP FOR UPDRAFT

ROTATION. LOW LEVEL BUOYANCY...ENHANCED BY SURFACE HEATING...WILL

FURTHER FAVOR THE POSSIBILITY OF A FEW...LIKELY

BREIF...TORNADOES...WHILE COLD CORE ENVIRONMENT AND LOW FREEZING

LEVELS ALLOW FOR POTENTIALLY VERY LARGE HAIL TO REACH THE SURFACE.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

400. MEAN STORM MOTION VECTOR 23025.





...CARBIN

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