WATCHES: Severe Thunderstorm Watch Number 440

WWUS20 KWNS 302156
SEL0
SPC WW 302156
NDZ000-SDZ000-010400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 440
NWS STORM PREDICTION CENTER NORMAN OK
400 PM MDT SAT JUN 30 2012

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

SOUTH CENTRAL NORTH DAKOTA
CENTRAL AND WESTERN SOUTH DAKOTA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
1000 PM MDT.

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 EAST AND WEST OF A LINE FROM 105 MILES NORTH
NORTHEAST OF MOBRIDGE SOUTH DAKOTA TO 95 MILES SOUTHWEST OF
PHILIP 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.

DISCUSSION...SCATTERED THUNDERSTORMS ARE INTENSIFYING ALONG A
BOUNDARY EXTENDING FROM THE BIS AREA SOUTHWESTWARD INTO THE BLACK
HILLS. HIGH CAPE VALUES AND SUFFICIENT EFFECTIVE SHEAR WILL PROMOTE
THE RISK OF SUPERCELLS CAPABLE OF HAIL AND DAMAGING WINDS THROUGH
THE EVENING. UNCERTAINTY REMAINS HOW MANY SEVERE STORMS WILL
MATERIALIZE...BUT THREAT APPEARS SUFFICIENT TO WARRANT A WATCH.

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 30020.


...HART

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