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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