Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 240918

Area Forecast Discussion
National Weather Service GLASGOW MT
318 AM MDT Mon Oct 24 2016

.SHORT TERM...for northeast through Wed...

Today will be another mild day with a long-wave upper ridge in
place with the axis over Montana. The ridge is currently anchored
by a broad area of high pressure centered around Texas. The
resulting flow aloft locally will be westerly but backing to the
southwest during the day. However the broad trough in eastern
Canada will exercise some minor influence for us - tempering
temperatures to around normal today. With a surface high to our
east, expect southeast winds of around 5 kts in the west and up to
15 kts in the east.

The closed low Pacific storm system swings north along the
Northwest coast and will be off Vancouver Island Monday night and
Tuesday. The trough movement will effectively push the local ridge
axis east of Montana. The storm ejects moisture into the Inter-
Mountain West and up against the Rockies. But Nemont will remain
in the quiet lee east of the Divide. Expect another pleasant Fall
day with highs a bit warmer than Monday.

Tuesday night the trough spins off a weak short-wave into Alberta
that will send a cold front through our area. Models suggest
scattered light rain showers, mainly south of the Missouri. The
disturbance will also shift the surface breeze to the west.

Wednesday will see the ridge rebound for another pleasant Fall


.LONG TERM...Wed night through Mon...

Pattern for the end of the week into the weekend features high
pressure over the Desert Southwest and trof off the West Coast.
This will result in a ridge over the Northern Rockies and plains
for much of the period. Several shortwaves ejecting from the
western trof will occasionally suppress the ridge before the
pattern potentially breaks down early next week.

Overall mild and dry conditions are expected for the period with
the general westerly flow aloft. A shortwave slided along the
Canadian border late Thursday but moisture expected to stay to the
north. Another wave comes out of the Great Basin on Saturday and
could spread some light rain into eastern Montana before a
stronger wave follows a similar track on Monday. Ebert



VFR with high clouds spilling into the region as a ridge builds
into the northern Rockies.




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