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835 

WWUS20 KWNS 162132

SEL6

SPC WW 162132

MTZ000-NDZ000-SDZ000-WYZ000-170500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 326

NWS STORM PREDICTION CENTER NORMAN OK

330 PM MDT WED JUN 16 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH-CENTRAL AND SOUTHEAST MONTANA

       EXTREME SOUTHWEST NORTH DAKOTA

       WESTERN SOUTH DAKOTA

       NORTHEAST WYOMING



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 330 PM UNTIL

1100 PM MDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF BILLINGS

MONTANA TO 75 MILES NORTHEAST OF RAPID CITY SOUTH DAKOTA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 325...



DISCUSSION...POTENT UPPER LEVEL TROUGH WILL CONTINUE TO PROVIDE

STRONG LARGE SCALE ASCENT AND AID SURFACE CYCLOGENESIS ACROSS THE

WATCH AREA THROUGH THIS EVENING. RESULTING LIFT WILL ACT ON STRONGLY

UNSTABLE AIRMASS AND CONTRIBUTE TO ROBUST AND INTENSE THUNDERSTORM

DEVELOPMENT AMIDST STRONG SHEAR. LOW LEVEL SHEAR WILL REMAIN

SUPPORTIVE OF UPDRAFT ROTATION...NEAR THE DEVELOPING SURFACE LOW AND

ALONG THE WARM FRONT DEVELOPING INTO SECTIONS OF ERN MT AND PARTS OF

THE WRN DAKOTAS THROUGH THE EVENING. DISCRETE STORMS NEAR THESE

FEATURES WILL BE CAPABLE OF PRODUCING TORNADOES IN ADDITION TO

POTENTIALLY VERY LARGE HAIL AND HIGH/DAMAGING WINDS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22025.





...CARBIN

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