SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN MONTANA EFFECTIVE THIS MONDAY AFTERNOON AND TUESDAY MORNING FROM 400 PM UNTIL 100 AM MDT

     URGENT - IMMEDIATE BROADCAST REQUESTED     SEVERE THUNDERSTORM WATCH NUMBER 430     NWS STORM PREDICTION CENTER NORMAN OK     400 PM MDT MON JUN 25 2012          THE NWS STORM PREDICTION CENTER HAS ISSUED A     SEVERE THUNDERSTORM WATCH FOR PORTIONS OF                  NORTHERN MONTANA          EFFECTIVE THIS MONDAY AFTERNOON AND TUESDAY MORNING FROM 400 PM     UNTIL 100 AM 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 75     STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH     SOUTHWEST OF CUT BANK MONTANA TO 15 MILES NORTH NORTHEAST OF     SIDNEY MONTANA.  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.          OTHER WATCH INFORMATION...CONTINUE...WW 426...WW 427...WW     428...WW 429...          DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND     INTENSITY ACROSS THE WATCH AREA LATE THIS AFTERNOON INTO TONIGHT AS     LARGE-SCALE FORCING STRENGTHENS AHEAD OF A MIDLEVEL JET STREAK     PROPAGATING NNEWD THROUGH THE NRN INTERMOUNTAIN REGION.  AIR MASS     ALONG TO THE N OF WNW-ESE ORIENTED SURFACE FRONT IS QUITE MOIST FOR     THE ELEVATION WITH MLCAPE VALUES APPROACHING 1500-3000+ J/KG.  WHEN     COUPLED WITH 35-50 KT OF EFFECTIVE BULK SHEAR...SETUP WILL FAVOR     SUPERCELLS AND BOWING STRUCTURES CAPABLE OF LARGE HAIL AND DAMAGING     WINDS.  A TORNADO IS ALSO POSSIBLE.          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 26020.               ...MEAD