Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 282023

Area Forecast Discussion
National Weather Service GLASGOW MT
223 PM MDT SUN AUG 28 2016

.SHORT TERM...for northeast Montana...tonight through Tue...

Synoptic Setup: A cool trough begins over the Northwest Territories
and runs down through Alberta and Southern Saskatchewan where it
fizzles out into zonal flow across Montana. Hot high pressure has
developed over Nevada and is slowly spreading north into Idaho in
the form of a ridge.

This afternoon through tonight... cold front will continue moving
though the area this afternoon cooling off the region with
stable high pressure overnight.

Monday through Tuesday... conditions should remain quiet and dry
through monday night as the ridge over Idaho shifts into western
Montana and provides an upper level stabilizing effect. Tuesday
the ridge will move over eastern Montana but weak disturbances
moving around the northeast side of the ridge may clip the far
northeast corner for isolated showers and thunderstorms. GAH

.LONG TERM...Tue night through Sun...
Not much change in order for the extended forecast with the
afternoon update. Did make some minor PoP changes in the extended
mainly to show a little bit agreement on long term model package
for the later periods. Otherwise previous discussion hits all the
major points for this afternoon forecast. Proton

Previous Discussion:
The extended period begins Tuesday evening with an upper ridge in
place over the Prairie Provinces and the Northern High Plains. Off
the West Coast of Canada and the Pac-NW is an upper trough that
will slowly move east through the period.

With increased heights initially, temperatures will continue 5f to
10f degrees above normal for Wednesday. The ridge axis will shift
east across the region Tuesday night causing upper flow to back
around to the southwest. Additionally, with the ridge shifting
east, desert air will drift north into the Canadian Prairie
through Montana. The boundary between the warm air-mass and the
cooler air-mass to the north will act as a warm front producing a
chance for showers and thunder through Wednesday night and

Thursday night and Friday, model differences in timing will
determine how the next approaching trough affects Northeast
Montana. The models suggest the trough will become broad and bring
in cooler air for the weekend behind a cold front that could be
timed Friday or Saturday.



Flight category: VFR

Synopsis: A cold front has pushed through the region this
afternoon with a mainly dry atmosphere behind it. Expect skies to
remain mostly fair through the period without any precipitation

Wind: Northwest wind behind the front will slowly shift to the
Northeast on Monday across the region however wind will remain
below 15 knots through the period.    Proton




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