

737 

WWUS20 KWNS 062251

SEL8

SPC WW 062251

NEZ000-070500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 338

NWS STORM PREDICTION CENTER NORMAN OK

555 PM CDT SAT JUN 6 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND WESTERN NEBRASKA



EFFECTIVE THIS SATURDAY AFTERNOON FROM 555 PM UNTIL MIDNIGHT 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 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES NORTH

NORTHWEST OF IMPERIAL NEBRASKA TO 25 MILES NORTH OF GRAND ISLAND

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 337...



DISCUSSION...CLUSTERS OF SUPERCELL THUNDERSTORMS ARE INTENSIFYING

OVER WEST CENTRAL NEB...AND WILL LIKELY TRACK EASTWARD THROUGH THE

EVENING ACROSS THE WATCH AREA.  LOW LEVEL VERTICAL SHEAR IS MARGINAL

FOR TORNADOES.  HOWEVER...DEEP LAYER SHEAR WILL MAINTAIN SUPERCELL

STRUCTURES AND POSE A RISK OF LARGE HAIL AND DAMAGING WINDS.



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 450. MEAN STORM

MOTION VECTOR 27030.





...HART

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