Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 180943

Area Forecast Discussion
National Weather Service Glasgow MT
243 AM MST Sat Nov 18 2017

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

Surface high will be over Northeast Montana today. NW flow aloft
will prevail today with shortwave trough to the east and building
ridge to the west. There will be some clouds at times today as
weak waves move through the area on the NW flow aloft. The
southwest half of the forecast area will be breezy this afternoon
where better mixing is expected along a lee side trough. Expect
dry weather today.

Upper ridge builds into Montana tonight and Sunday with warmer air
mass. This will bring dry weather and warmer temperatures which
will be above normal temperatures on Sunday.

.LONG TERM...Sun night through Sat...

Surface low moves across Saskatchewan Sunday Night as an upper
trough moves through the Canadian Prairies Sunday Night and
Monday. Mild temperatures will continue to prevail Sunday Night
over the forecast area with warm air over the area. However, a
strong but mainly dry cold front drops southeast across the
forecast area Monday morning. The front will bring gusty west to
northwest winds which will likely be strong enough for a Lake Wind
Advisory for Fort Peck Lake. Cold air advection is also expected
to be strong enough for falling temperatures Monday afternoon.

Much colder temperatures will prevail Monday Night as high
pressure builds into the area from Canada. 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
and a warm front moves east across Eastern Montana. There may be
enough overrunning moisture for a slight chance of rain or snow
showers Wednesday morning in the east. Much warmer temperatures
move into the area on Wednesday with highs ranging from around 40
NE to near 60 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. Another shortwave Friday Night will bring
another cold front through the area which will return temperatures
to near normal for Saturday. Forrester



VFR conditions will prevail across all NE Montana TAF sites
throughout the TAF cycle, with some low VFR and mid level are
expected from time to time.

Mainly west winds will prevail today with speeds 5 to 10 knots
early increasing to 10 to 15 knots this afternoon. Winds will turn
to the SW tonight at 5 to 10 knots.




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