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489 

WWUS20 KWNS 060535

SEL6

SPC WW 060535

NEZ000-061200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 336

NWS STORM PREDICTION CENTER NORMAN OK

1235 AM CDT SAT JUN 6 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEASTERN NEBRASKA



EFFECTIVE THIS SATURDAY MORNING FROM 1235 AM UNTIL 700 AM 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST

OF COLUMBUS NEBRASKA TO 45 MILES EAST OF LINCOLN NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



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 335...



DISCUSSION...MCS IS EXPECTED TO EVOLVE FROM INTENSE STORMS OVER

CENTRAL NEB LATE TONIGHT AND SHIFT EWD ACROSS SERN NEB ALONG NOSE OF

INTENSE LLJ.  APPEARS SUFFICIENT DEEP LAYER SHEAR AND INSTABILITY

WILL BE PRESENT FOR ISOLATED SUPERCELLS AND POSSIBLE EVOLUTION INTO

A BOWING MCS.  LARGE HAIL AND DAMAGING WINDS SHOULD ACCOMPANY THE

MORE INTENSE STORMS.



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 27030.





...EVANS

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