Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 220408

Area Forecast Discussion
National Weather Service Glasgow MT
908 PM MST Sun Jan 21 2018


Evening Update (9pm MST): No major changes to the forecast. Only
some minor tweaks to sky, PoP and weather grids were made to
address another night of possible freezing fog in the river
valleys and to address the weak system moving through tomorrow
which may bring some light snowfall to southern areas.


PREVIOUS DISCUSSION: A narrow upper ridge passes over eastern
Montana tonight for a continuation of clear skies resulting in
seasonally cold minimum temperatures. Light wind will not
interfere much with mixing, therefore patchy freezing fog is again
possible. By Monday morning clouds will move in from the west as
a result of an upper trough and weak cold front. Limited moisture
and the weak forcing will likely result in either no precipitation
or very limited for Monday. Slightly increased winds means
slightly warmer highs, but just above normal.

Tuesday another high pressure ridge will move across western
CONUS, bringing seasonally mild conditions and near normal
temperatures through Wednesday.

Models continue to show a deep, long-wave trough and associated cold
front that will move through northeast Montana late this week,
bringing rain and snow showers to the area Thursday night through
Saturday. Precipitation amounts are still in a state of flux, with
models suggesting differing amounts and locations. Temperatures
will continue several degrees around normal into the weekend.




Expected Flight Category: VFR

Synopsis: High pressure continues to dominate over the region for
much of the coming day or so. High clouds will spread across the
region in advance of the weak system expected to push through
tomorrow. This will work to inhibit the potential for the
development of freezing fog. Should any of the sites remain clear
for much of the night, redevelopment of the freezing fog is
possible, especially at OLF and GGW.

Wind: Expect continued west to southwest winds mainly at 5-10 kts,
though some periods of 10-15 kt winds may be possible tomorrow





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