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Midweek turns frigid as arctic air moves in

Lows drop to the single digits even in valleys
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Posted at 3:23 PM, Oct 19, 2020
and last updated 2020-10-19 17:23:05-04

MISSOULA — It is another wet and cooler start to our workweek.

Showers and snow showers become less widespread Monday night into Tuesday morning.

Our next round of moisture arrives on Tuesday afternoon and evening.

These showers will most likely be concentrated closer to the Divide and through the I-90 and Bitterroot/ Sapphire Mountain and Bitterroot Valley corridors.

Highs Tuesday will be in the upper 40s and low 50s in valleys and closer to the upper 30s and low 40s in mountains.

This means there is a chance of later snow showers in mountains Tuesday night, but rain remains in our valley forecasts.

Midweek things get a little interesting.

While temperatures have remained below average this weekend and to begin this week, things will REALLY take a colder turn on Wednesday.

Air from the north, another Canadian cold front, will drop down across North-Central Montana.

Unlike this weekend, cold air is expected fill in rapidly across all Western Montana.

This means highs Wednesday will be in the mid to low 40s but overnight lows Wednesday into Thursday will drop to the teens and 20s in low elevation valleys.

Thursday’s highs in these lower elevations will hover right at or just slightly above freezing.

Moisture remains in our forecast to end our week, so colder air and moisture mix together to create snow levels dropping as low as valley floors that have yet to see snow accumulation this season.