Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 280834
AFDGGW

Area Forecast Discussion
National Weather Service GLASGOW MT
234 AM MDT WED SEP 28 2016

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

A back door cold front moved through Northeast Montana during the
night. This will bring cooler temperatures and dry weather to the
forecast area today as Canadian high pressure builds into
Saskatchewan. This will turn northerly winds early this morning to
a mainly easterly direction during the day. Meanwhile, upper ridge
will also remain over Eastern Montana today.

The upper ridge and surface high moves to the east tonight. Dry
weather will continue under mostly clear skies.

Winds will turn to the southeast on Thursday and become somewhat
stronger as a lee side surface trough develops over Central
Montana. Temperatures will be somewhat warmer as thermal ridge
develops over Montana.

SW flow aloft will prevail Thursday and Friday with the ridge to
the east and an upper trough over the Eastern Pacific. A shortwave
trough will move through Southeast Montana Thursday Night which
could bring a chance of rain showers to the southeast zones.

The wave moves to the east Friday morning. Look a dry and warm
day with the forecast area between waves. Forrester

.LONG TERM...Fri night through Wed...

Synoptic setup: long range begins with a ridge running northward
from the Four Corners through eastern Montana and southern
Saskatchewan. A large trough sets over the coast of northern
California The Pacific Northwest and most of British Columbia. An
equal amplitude ridge is directly behind that over the Gulf of
Alaska moving up through the whole of Alaska itself and into the
Arctic.

Friday night through Saturday: ridge across the area will bring
warm and dry conditions Friday Night and Saturday. Meanwhile the
trough will move farther inland into western Montana exiting the
front range.

Saturday night through Monday night: Trough will move across the
region bringing rain showers and maybe an isolated thunderstorm
or two initially in the evening hours. On and off Rain showers
will stick around through the remainder of the periods. By Monday
a cold Canadian air tap may develop which could bring a limited
amount of arctic air into the region and lower overall
temperatures.

Tuesday Onward: With he Arctic air tap pulling in a pool of
colder air temperatures will begin to struggle to reach the 70s
for highs. Some isolated snow may begin to develop in the
mountains as well with any passing shortwave. Confidence in this
group of periods is low and forecast is easily subject to change.
GAH

&&

.AVIATION...
FLIGHT CATEGORY: VFR.

SYNOPSIS: Skies will be mostly clear for most of the TAF sites
through This morning. A cold front will move across the area this
morning shifting winds.

WIND: A cold front will shift the winds to out of the north at 5
to 15 kts through the morning hours. By the afternoon winds will
veer around to the east.

GAH

&&

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

&&

$$

weather.gov/glasgow



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