WATCHES: Severe Thunderstorm Watch Number 560

WWUS20 KWNS 012214
SEL0
SPC WW 012214
NEZ000-SDZ000-020500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 560
NWS STORM PREDICTION CENTER NORMAN OK
515 PM CDT SUN AUG 1 2010

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

CENTRAL NEBRASKA
CENTRAL AND EASTERN SOUTH DAKOTA

EFFECTIVE THIS SUNDAY AFTERNOON FROM 515 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 80 MILES WEST OF
MULLEN NEBRASKA TO 15 MILES NORTH NORTHEAST OF MITCHELL SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 558...WW 559...

DISCUSSION...THUNDERSTORMS ARE BEGINNING TO INCREASE ALONG A SURFACE
BOUNDARY EXTENDING ACROSS PORTIONS OF SD/NEB. STRONG INSTABILITY
AND SUFFICIENT VERTICAL SHEAR WILL SUPPORT A RISK OF ISOLATED SEVERE
STORMS CAPABLE OF DAMAGING WINDS AND HAIL THROUGH MUCH OF THE
EVENING.

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 29025.

...HART

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