MISSOULA — High pressure will lead to some morning valley fog then sunny skies Thursday and Friday. Inversions will also develop in valley locations under this ridge of high pressure. Many valleys will struggle to warm temperatures above freezing Thursday and Friday as cold air pools develop. Higher elevations or locations that can break free of the inversions can expect nice, seasonal weather with sunshine and temperatures in the upper 30's to low 40's.
The high pressure ridge will start to break down Saturday. Expect partly cloudy to mostly cloudy skies with high temperatures in the upper 30's to middle 40's.
We are still looking at a fairly significant pattern change moving into the week of Thanksgiving. This change will start Sunday, however, as temperatures remain in the upper 30's and 40's expect snow for the mountains and rain/snow for the valleys.
The coldest air is then expected to arrive Monday and last through the rest of next week. High temperatures will top out in the low to middle 30's Monday then fall into the 20's and low 30's for the rest of the week.
Scattered snow showers will be in the forecast through next week as well, unfortunately, snow amounts and timing are still uncertain as some of the details are still unclear. At the very least, expect scattered snow showers through next week.