Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 260912

Area Forecast Discussion
National Weather Service Glasgow MT
312 AM MDT Tue Sep 26 2017

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

The closed upper low has very slowly drifted through the eastern
zones of Northeast Montana last evening through this morning. This
brought light rain longer than models indicated. The models
predict the trough will finally move all the way into the Dakotas
this morning, but there may yet be some lingering showers. When
the clouds and showers depart, high RHs suggest more morning fog.

The large upper level ridge up against the West Coast begins to
be the main influence for our weather during the short term. 500mb
wind will continue to be northerly sending a constant flow of dry
air into eastern Montana. However clouds won`t completely clear
out of the area today. So, with some cool air staying around, and
a surface breeze turning northwest, highs today will end up close
to normal, a pleasant enough day.

Wednesday the ridge pushes farther east allowing warmer air to
creep in for another mild day with highs in the upper 60s to lower


.LONG TERM...Wed night through Tue...

Upper trof currently over the region expected to split as it moves
east leaving a weak upper low over the Great Basin into mid week.
An upper ridge spreads into western Canada, then east into the
plains through the end of the week. Dry and warm weather expected
with the ridge sliding over Montana and temperatures near or above

The next trof pushes into the northern Rockies by the weekend.
Some potential to tap into the moisture streaming north from
Mexico and produce a few showers by Saturday night or Sunday as
the upper trof swings across the state. Model differences as
usual at the end of the forecast period, but all suggesting the
trof developing into a closed low as it lifts into central
Canada. This could keep rain chances over the region into early
next week. Ebert



VFR, except for areas of morning fog.

Northeast Montana is caught between a slow exiting trough and
entering ridge to the west. This will lead to low stratus and
potentially fog at eastern terminals and clearing skies along the
western terminals early this morning.

Fog: A chance exists for fog at KOLF, KSDY and KGDV this morning.

Wind: south to southeast at 10 kts or less, veering to the
southwest and west today.





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