SEL3 URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 363 NWS STORM PREDICTION CENTER NORMAN OK 545 PM MDT FRI JUN 8 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EAST CENTRAL AND NORTHEAST MONTANA EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 545 PM UNTIL 100 AM 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 100 STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH NORTHEAST OF GLASGOW MONTANA TO 25 MILES WEST OF MILES CITY MONTANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). 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...AN INCREASE IN COVERAGE/INTENSITY OF STORMS IS EXPECTED THIS EVENING IN THE AREA W OF A LINE FROM GGW-MLS...ALONG A SURFACE FRONT TO THE N OF A SURFACE LOW NEAR THE WY/MT BORDER...AS A MIDLEVEL LOW MOVES EWD OVER THE NRN ROCKIES. LOW-LEVEL MOISTURE WILL CONTINUE TO SPREAD NWWD FROM THE DAKOTAS INTO ERN MT...WHERE THE COMBINATION OF INSTABILITY/VERTICAL SHEAR WILL BE SUFFICIENT FOR SUPERCELLS. LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN SEVERE THREATS THROUGH TONIGHT...THOUGH A TORNADO CANNOT BE RULED OUT LATE THIS EVENING IN NE MT WHERE A DISCRETE STORM ENCOUNTERS A MORE MOIST BOUNDARY LAYER IN THE GGW-GDV-JDN AREA. 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 25025.
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