Area Forecast Discussion
Issued by NWS Glasgow, MT

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924
FXUS65 KGGW 190852
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
252 AM MDT Thu Jul 19 2018

.DISCUSSION...

A cold front will move south across Northeast Montana this morning
with north to northwest winds developing behind the front.
Somewhat cooler temperatures can be expected today. Meanwhile,
there will some weak waves in NW flow aloft today which will
combine with unstable air mass to bring isolated thunderstorms to
parts of the region this afternoon and evening. It may be unstable
enough for a strong storm possibly severe storm especially in the
northeast.

Upper level ridge and surface high builds into the forecast area
tonight and Friday. This will bring dry weather to the region.
The surface high moves to the east Friday Night and a surface
trough moves into Central Montana. Surface gradient will tight
across Eastern Montana Friday Night which will funnel gusty east
to southeast winds up the Milk River Valley and Fort Peck Lake.
East winds will likely be strong enough for a Lake Wind Advisory
Friday Night.

The surface trough moves into Eastern Montana Saturday morning
which shift the SE winds to the west in the western zones.
However, it is expected to take until sometime Saturday Night for
this trough to reach the North Dakota border which will allow the
gusty SE winds to continue all day in the east. It may be unstable
enough along the Canadian Border for a chance of Thunderstorms on
Saturday Flow aloft will turn to the SW during the day as an
upper trough/low moves into Alberta.

A cold front moves through the forecast area Saturday Night and
Sunday morning followed by the upper trough Sunday afternoon.
Parts of the forecast area could have a shower or thunderstorm
from these systems. Gusty NW winds are likely behind the cold
front on Sunday and another Lake Wind Advisory is likely.

An upper low lingers over the Canadian Prairies with NW flow aloft
over Montana on Monday. A shortwave rotating around the low is
expected to bring a cold front through the forecast area Monday
Night. The low then moves to the east and NW flow aloft will
prevail the remainder of the period with slightly below normal
temperatures. Forrester

&&

.AVIATION...

Expected Flight Category: VFR

Synopsis: Isolated Thunderstorms are possible at times today and
this evening. Skies will vary from clear to broken as there will
mid and high clouds at times through this evening. Skies will be
mostly clear after sunset this evening.

Winds: Light and variable early, becoming northerly by late
morning with gusts to around 18 knots. Winds will veer northeast
and east tonight at 5 to 10 knots.


&&

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

&&

$$

weather.gov/glasgow



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