486 FXUS65 KTFX 290301 AFDTFX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 900 PM MDT MON SEP 28 2015 .DISCUSSION... NO UPDATE REQUIRED THIS EVENING. HIGH PRESSURE ALOFT CONTINUES AS DOES THE DRY AND STABLE CONDITIONS. ANOTHER COOL NIGHT BUT WINDS BECOMING SOUTHERLY AFTER MIDNIGHT WILL LIKELY KEEP TEMPERATURES FROM FALLING AS LOW AS THIS MORNING'S READINGS. && .AVIATION... UPDATED 2330Z. HIGH PRESSURE ALOFT CONTINUES TO PROVIDE DRY AND STABLE CONDITIONS. WINDS WILL REMAIN LIGHT. VFR CONDITIONS PREVAIL. && .PREV DISCUSSION...ISSUED 302 PM MDT MON SEP 28 2015 MONDAY THROUGH WEDNESDAY...DRY AND MILD CONDITIONS WILL CONTINUE THROUGH THE FIRST HALF OF THE WEEK. WESTERLY FLOW ALOFT AT THE TOP OF A FLATTENED RIDGE CENTERED OVER BAJA PENINSULA WILL EVENTUALLY TURN TO MORE SOUTHWESTERLY AS THE RIDGE EXPANDS INTO CENTRAL MONTANA. TEMPERATURES WILL WARM EACH DAY IN RESPONSE TO THIS INCREASE IN THE UPPER LEVEL RIDGE. WINDS ARE EXPECTED TO BE GENERALLY LIGHT THROUGHOUT THE TIME PERIOD WITH SOME GUSTY WINDS POSSIBLE IN THE AFTERNOON HOURS. SUK WEDNESDAY NIGHT THROUGH MONDAY...A HIGH PRESSURE RIDGE WILL BE OVER CENTRAL AND SOUTHWEST MONTANA WEDNESDAY NIGHT BUT A LOW PRESSURE TROF IN THE EASTERN PACIFIC WILL BE APPROACHING THE WEST COAST. HEIGHTS ALOFT WILL BE FALLING THURSDAY AS THE TROF MOVES OVER THE WEST COAST. MOISTURE AHEAD OF THIS SYSTEM WILL BE MOVING INTO SOUTHERN IDAHO AND SOME SHOWERY ACTIVITY WILL DEVELOP OVER THE SOUTHWEST ZONES AS EARLY AS THURSDAY AFTERNOON. VERY WEAK INSTABILITY WILL DEVELOP AND THE EXTREME SOUTHERN PORTIONS OF THE REGION COULD SEE A THUNDERSTORM OR TWO. FLOW THROUGH THE SYSTEM WILL BE VERY WEAK AND DYNAMICS WEAK AS WELL. HOWEVER, THE SYSTEM SLOWS DOWN AND THE AIR MASS WILL REMAIN MOIST AND UNSETTLED THROUGH AT LEAST SATURDAY NIGHT. ACTIVITY WILL AT FIRST MAINLY BE SHOWERS ACROSS THE SOUTHWEST ZONES BUT, TO THE NORTH, A COLD FRONT WILL BE APPROACHING THE CANADIAN BORDER LATE FRIDAY. THIS WILL BRING COOLER TEMPERATURES INTO THE REGION AND SOME SNOW AT HIGHER ELEVATIONS. THE AIR MASS WILL BEGIN TO WARM AND DRY AGAIN SUNDAY AS HIGH PRESSURE BEGINS TO BUILD ALOFT AGAIN. ZELZER && .PRELIMINARY POINT TEMPS/POPS... GTF 39 73 42 73 / 0 0 0 10 CTB 36 70 38 72 / 0 0 0 10 HLN 43 75 45 77 / 0 0 0 10 BZN 38 73 39 75 / 0 0 0 10 WEY 29 67 29 66 / 10 10 10 10 DLN 41 74 42 74 / 0 0 0 10 HVR 36 70 38 71 / 0 0 0 10 LWT 41 73 43 74 / 0 0 0 10 && .TFX WATCHES/WARNINGS/ADVISORIES... NONE. && $$ WEATHER.GOV/GREATFALLS