WATCHES: Severe Thunderstorm Watch Number 411

WWUS20 KWNS 252014
SEL1
SPC WW 252014
MNZ000-NDZ000-SDZ000-260400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 411
NWS STORM PREDICTION CENTER NORMAN OK
315 PM CDT FRI JUN 25 2010

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

WEST CENTRAL MINNESOTA
SOUTHERN NORTH DAKOTA
NORTHERN SOUTH DAKOTA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 315 PM UNTIL
1100 PM 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES WEST
SOUTHWEST OF BISMARCK NORTH DAKOTA TO 45 MILES SOUTH OF FARGO
NORTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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...ISOLATED THUNDERSTORMS ARE EXPECTED TO INTENSIFY THIS
AFTERNOON OVER PORTIONS OF ND/SD IN REGION OF MOIST AND VERY
UNSTABLE AIRMASS. PRIMARY FOCI FOR INITIATION WILL BE MULTIPLE WEAK
LOW LEVEL BOUNDARIES IN REGION OF WEAK CINH. MODERATE EFFECTIVE
SHEAR WILL PROMOTE SUPERCELLS CAPABLE 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 500. MEAN STORM
MOTION VECTOR 28030.

...HART

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