Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 181641

Area Forecast Discussion
National Weather Service Glasgow MT
941 AM MST Sat Jan 18 2020


945 PM:
Did a refresh of wind and sky fields to the latest model output.
Otherwise no other updates were really needed. GAH

Arctic high pressure will be over Central and Eastern Montana
today and Eastern Montana tonight. Bitter cold air mass will
continue to combine with west to NW winds today to drop wind
chills to -25 to -50 this morning with the coldest wind chills
near the Canadian border. Will maintain Wind Chill Warning in the
north this morning and transition it to a Wind Chill Advisory this
afternoon and keep it in effect through Sunday morning. Will keep
Wind Chill Advisory going in the south this morning. Temperatures
will stay below zero in the north today and only rise to the
single digits in the south.

Another bitter cold night with light winds is expected in the
south tonight with Arctic high in place. A weak wave may bring
enough clouds to some areas tonight to limit how fall temperatures

The high remains over NE Montana on Sunday. While an upper ridge
builds over Western Montana and warmer air starts to move in
aloft. Shallow arctic air remains in place which will keep
temperatures cold although they will be somewhat warmer.

The upper ridge will be over Eastern Montana on Monday with much
warmer air aloft. Most areas will have highs in the 20s and 30s.

Temperatures remain warm on Tuesday ahead of a shortwave trough
and weak cold front on Wednesday.

The remainder of the week looks to be mild and dry with an upper
ridge. Forrester



DISCUSSION: Skies will be mostly clear with scattered mid level
clouds at times. Sct-bkn mid level clouds are expected in some
areas tonight.

EXTREME COLD: Temperatures will hover around zero to 5 above for
highs today. It will then fall to -10 to -20 tonight. The bitter
cold will lead to mechanical breakdowns on airport equipment and

WIND: NW to west today 10 to 15 knots. Winds will become light and
variable tonight.



Wind Chill Warning until noon MST today for Daniels...Northern
Phillips...Northern Valley...Sheridan.

Wind Chill Advisory until 11 AM MST Sunday for Daniels...
Northern Phillips...Northern Valley...Sheridan.

Wind Chill Advisory until 11 AM MST Sunday for Central and
Southeast Phillips...Central and Southern Valley...Eastern
Roosevelt...Richland...Southwest Phillips...Western Roosevelt.

Wind Chill Advisory until noon MST today for Dawson...Garfield...


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