650 FXUS65 KMSO 150918 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 318 AM MDT Mon Oct 15 2018 .DISCUSSION...High clouds aloft associated with a weak weather system brushing over Western Montana early this morning are keeping temperatures in many places a bit more temperate than forecast. However, there are several breaks in these clouds, and it will take only an hour or two for temperatures to plummet and fog or stratus to develop. Temperatures this afternoon will be once again below normal, the 15th occurrence of below normal temperatures over the past 16 days (spanning back to September 28th). However, high pressure building along the west coast will begin to slide inland this evening and slowly east throughout the week; a trend which will initiate a persistence of above normal daytime high temperatures and crisp, cold, near normal October mornings. This trend will continue through the second half of the week as high pressure remains in place. In fact, it doesn't appear that this area of high pressure will leave our area until early next week (Oct 21-23), so above normal high temps and dry conditions will continue through then. && .AVIATION...Periodic reductions in visibility from fog sloshing in and out at KGPI have been occurring so far this morning, and should continue through roughly mid-morning before improving. KMSO may also be mildly impacted by nearby fog, though not for a prolonged period of time. Pleasant conditions with plenty of sun and light afternoon winds will occur thereafter for the entirity of the Northern Rockies due to persistent high pressure. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. && $$ |