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Valley inversions means weekend fog and difficult travel

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Today, there will be a chance of freezing fog this morning for valleys west of the divide. Otherwise, partly sunny skies in west central and NW Montana with high temperatures in the upper 20s to 30. Clearing skies in SW Montana with highs rising into the low to mid 30s.

Strong high pressure will continue to build into western Montana, bringing fog formation and travels impacts to the region. The high pressure will create two scenarios for areas in western Montana.

For valleys west of the divide. from the Bitterroot Valley north into the Flathead Valley, locally dense fog will be a concern Friday through early next week. Strong temperature inversions will allow high temperatures to only rise into the 20s, while lows will be in the upper 10s to near 20.

For southwest Montana and areas east of the divide, there will be a slight warming trend and mostly sunny skies this weekend and early next week. Temperatures will rise into the lower 40s in Bozeman Saturday and Sunday. Lows in southwest Montana will be in the upper single digits and teens.

We're tracking the possibility of a slight weakening of the high pressure ridge by Wednesday, which could lead to an isolated shower. However, precipitation probabilities are quite low at this time.

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