Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 201611

Area Forecast Discussion
National Weather Service GLASGOW MT
911 AM MST Fri Jan 20 2017

.SHORT TERM...for northeast through Sun...

A little patchy freezing fog in some of the river valleys and
eastern zones was added to the wx grids this morning given recent
observations. Otherwise continue to see isolated showers across
portions of Petroleum and Garfield Counties with some slick spots
where temperatures are hovering on either side of freezing.
Travelers in this area are encouraged to use caution and allow
some extra time in case of encountering those isolated pockets.
Other forecast elements remain in excellent working order with
only minor tweaks. Maliawco

Previous Discussion...

A messy weather pattern over North America for the next several
days. Upper trof extending from the Gulf of Alaska into the Great
Basin with ridging over the eastern Canada. Another upper low is
lifting into the upper Great Lakes region this morning. Great
Basin trof is expected to slowly move east through the weekend and
phase with the fairly stationary Great Lakes low by early next

Shear zone over eastern Montana this morning with band of moisture
to the west. Occasional light precipitation is falling from the
moisture band over central Montana. Shear zone and moisture will
very slowly work eastward today through Saturday night. By Sunday
expect some clearing with ridge building into the northern
Rockies. Temperatures expected to be a little cooler over the next
few days with the broad trof in place. Ebert

.LONG TERM...Sun night through Fri...

Amid some weak low pressure systems and a generally progressive
upper-level flow pattern, northeast Montana is in for only a few
passing slight chances for scattered snow showers in the extended
forecast period.

The general large-scale upper-level trough pattern concentrates
the best of these chances for snow from Monday through Wednesday
night. Otherwise expect a very quiet weather pattern with
temperatures at or slightly below normal level for this time of




FLIGHT CATEGORY: VFR becoming MVFR later this morning, then VLIFR
possible late tonight.

SYNOPSIS: As low level moisture continues to increase across the
area, it seems to be just a matter of time before areas of fog or
widespread fog sets in across most of northeast Montana. Chances
increase in Sunday Morning.

WIND: From the west or northwest at or less than 10 mph.




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