WATCHES: Severe Thunderstorm Watch Number 386

WWUS20 KWNS 132027
SEL6
SPC WW 132027
NDZ000-SDZ000-140400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 386
NWS STORM PREDICTION CENTER NORMAN OK
225 PM MDT WED JUN 13 2012

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

WESTERN AND CENTRAL NORTH DAKOTA
NORTHWEST AND NORTH-CENTRAL SOUTH DAKOTA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
1000 PM MDT.

HAIL TO 2.5 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 EAST AND WEST OF A LINE FROM 20 MILES EAST OF RAPID
CITY SOUTH DAKOTA TO 15 MILES NORTHEAST OF GARRISON NORTH DAKOTA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON INTO EVENING AHEAD OF SHORTWAVE TROUGH AND
ASSOCIATED COLD FRONT MOVING OUT OF THE NRN HIGH PLAINS. WARM
SECTOR ENVIRONMENT IS CHARACTERIZED BY STEEP LAPSE RATES AND
BOUNDARY LAYER DEWPOINTS IN THE 50S...YIELDING MLCAPE OF 1000-1500
J/KG. WHEN COUPLED WITH 50 KT OF DEEP-LAYER SHEAR...SETUP WILL
FAVOR SUPERCELLS AND BOWING STRUCTURES CAPABLE OF LARGE HAIL AND
DAMAGING WIND GUSTS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27025.


...MEAD

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