WATCHES: Severe Thunderstorm Watch Number 662

WWUS20 KWNS 070149
SEL2
SPC WW 070149
NEZ000-070800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 662
NWS STORM PREDICTION CENTER NORMAN OK
850 PM CDT SUN JUL 6 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHWEST AND SOUTH CENTRAL NEBRASKA

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 850 PM UNTIL
300 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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST
NORTHWEST OF IMPERIAL NEBRASKA TO GRAND ISLAND NEBRASKA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

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 660...WW 661...

DISCUSSION...THE INTERACTION OF MERGING OUTFLOWS AND A STALLED FRONT
ACROSS SRN NEB WILL SUPPORT ADDITIONAL THUNDERSTORM DEVELOP THROUGH
THE OVERNIGHT HOURS. THUNDERSTORM COVERAGE/INTENSITY WILL BE AIDED
BY THE APPROACH OF A WEAK SHORTWAVE TROUGH FROM THE SW AND WARM
ADVECTION ON THE NOSE OF A DEVELOPING LLJ IN KS. MODERATE
INSTABILITY AND EFFECTIVE BULK SHEAR OF 35-40 KT ON THE COOL SIDE OF
THE STALLED FRONT SHOULD BE SUFFICIENT FOR ORGANIZED STORM
CLUSTERS...AND PERHAPS SUPERCELLS. LARGE HAIL AND DAMAGING WINDS
WILL BE THE MAIN THREATS...THOUGH AN ISOLATED TORNADO CANNOT BE
RULED OUT GIVEN THE MOIST BOUNDARY LAYER AND POTENTIAL FOR A FEW
STORM/BOUNDARY INTERACTIONS.

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 24015.

...THOMPSON

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