Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 190935
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
235 AM MST Sun Nov 19 2017

.SHORT TERM...for northeast Montana...today through Mon...

Upper ridge will be over Montana today with warmer temperatures.
There will be mid and high clouds at times with either mid and
high level moisture moving across the ridge or chinook arch clouds
that form in the lee of the Rockies reaching as far as Northeast
Montana. Highs will be 10 to 15 degrees above normal with highs in
the 40s NE to mid 50s SW.

The ridge will be flattened tonight as upper trough moves inland
across British Columbia. The warm air in place will keep
temperatures mild tonight. The fast moving trough will move
across the Canadian Prairies and Montana tonight and Monday which
will bring a cold front across the forecast area during the day on
Monday. Gusty NW winds and quickly falling temperatures in the
afternoon and evening will be the main impacts of this front.
Winds will be strong enough Monday afternoon that a Lake Wind
Advisory is likely for Fort Peck Lake. Little or no chance for
precipitation is expected with this front.

.LONG TERM...Mon night through Sun...

Much colder temperatures will prevail Monday Night as high
pressure builds into the area from Canada. Lows could fall to near
zero along the Canadian border with wind chills near -20. The
cold temperatures will continue on Tuesday in NW flow aloft and
the surface high over the area.

Tuesday Night and Wednesday morning, flow aloft turns more WNW as
an upper ridge moves inland from the Pacific and a warm front
moves east across Eastern Montana. There may be enough overrunning
moisture for a slight chance of rain or snow showers that could
mixed with freezing rain or sleet Late Tuesday Night and
Wednesday morning. Much warmer temperatures move into the area on
Wednesday with highs ranging from around 40 NE to near 65 SW.

Upper ridge moves through the area on Thursday which will allow
for a warm and dry Thanksgiving Day across the region.

A shortwave trough moves along the MT/Canada border Thursday Night
and Friday which will bring a cold front with somewhat cooler
temperatures on Friday. There may be enough moisture for a slight
chance of rain or snow showers.

Saturday looks mainly dry with a surface high over the Dakotas.
Temperatures will be closer to normal for late November. Upper
ridge returns on Sunday with mainly dry weather. Forrester



&&

.AVIATION...

Flight Category: VFR today and tonight.

Synopsis: A high pressure ridge moves over the region today and
remains over the area tonight with mid-to-high level clouds.

Wind: light and variable early becoming west to southwest 10 to
knots this afternoon. SW winds will continue tonight at 5 to 15
knots.

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

weather.gov/glasgow


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