Area Forecast Discussion
Issued by NWS Glasgow, MT

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000
FXUS65 KGGW 130910
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
210 AM MST Wed Dec 13 2017

.DISCUSSION...

An upper ridge over the Pacific Coast will remain in place today
as an upper level trough remains to the east of the forecast area.
This will result in NW flow aloft over the forecast area. A cold
front and shortwave trough last evening that brought strong NW
winds to the forecast area overnight has moved to the east. NW
winds will gradually diminish during the day today. Cooler
temperatures will prevail today with highs in the 30s NE and 40s
SW which is still about 10 to 15 degrees above normal.
The next shortwave trough and cold front moves through the region
this evening. This system has enough moisture with it for a chance
of snow showers mainly in the east. This will result in Thursday`s
highs being somewhat colder than today.

The upper ridge gets moved east on Thursday by an upper trough
moving through the Gulf of Alaska and Eastern Pacific. This will
bring mainly dry weather to Northeast Montana Thursday and
Thursday Night.

That ridge moves through Montana on Friday with warmer
temperatures returning. At the same time the upper trough moves
into the Canadian Prairies and Pacific NW. This will bring a cold
front through the forecast area either Friday afternoon or
evening. The trough moves through Montana Friday Night and
Saturday. Moisture is expected primarily Friday Night for
Northeast Montana at this point with a chance of rain and snow
showers depending on temperatures.

A shortwave ridge moves through the area on Sunday with dry and
somewhat warmer weather. Then, the next shortwave trough and cold
front on NW flow aloft Sunday Night and Monday will bring a
chance of mainly snow showers to the region.

Models have this front quasi-stationary to the SW of the forecast
area on Tuesday and differ on whether or not to keep it there on
Wednesday or bring it east as a warm front. Models also hint at
the possibility of overrunning moisture that could bring a chance
of rain or snow. Forrester


&&

.AVIATION...

Flight Condition: VFR today and a mix of VFR/MVFR tonight.

Clouds/wx: There will be mid level clouds at times today. The NE
corner of the state could have low clouds. More widespread low
clouds are expected behind a cold front late tonight with MVFR
ceilings.

Winds: NW winds will gradually diminish during the day today.
Winds speeds will be 15 to 20 knots this morning and 10 to 15
knots this afternoon. A cold front this evening will increase NW
winds to 15 to 20 knots tonight.



&&

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

&&

$$

weather.gov/glasgow



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