Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 240327
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
827 PM MST Fri Feb 23 2018

.DISCUSSION...

815PM UPDATE:
After an immediate drop with sun down in temperatures overPhillips
county, needed to do a reasessment at overnight lows. A couple
spots had already broke them by a degree or two. Ended up lowering
areas along river valleys and coulees after observing trends on
the GOES-16 10.33 channel. Wind chills also adjusted down and wind
speeds climbed slightly over the next several hours. Therefore,
have expanded the wind chill advisory. GAH


PREVIOUS SHORT TERM DISCUSSION:
A semi-permanant Arctic high will continue to have much control
of temperatures, especially for the valley locations. Temperatures
continue to fall well short of guidance while some locations on
ridge tops are close. Under conditions like this, temperatures,
sky and wind are the main forecast challenges.

But a system will begin to at least brush the CWA starting
Saturday Night in the form of wind. 850 mb winds increase with the
first system Saturday Night while the inversion weakens. This
looks to happen again late Sunday Night into Monday with a surface
low moving east across southern Sask. Drifting snow may be
confined to just SW Phillips County, not as bad as central
Montana. Will reissue the HWO for just SW Phillips County for
Sunday and Sunday Night.

After that, things are pretty quiet for much of next week until
a large closed low comes at us late Friday or Saturday. This
system will bring the area snow but enough downsloping should
limit heavy amounts. Jamba


&&

.AVIATION...

FLIGHT CAT: VFR.

SYNOPSIS: There could be some low clouds around again
Saturday morning that might bring temporary MVFR conditions.

WIND: Strong drainage effect will control valley winds near
terminals tonight. Becoming west at 5 to 15 kts Saturday
afternoon.

Jamba/GAH


&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Wind Chill Advisory until 11 AM MST Saturday for Central and
Southeast Phillips...Central and Southern Valley...Daniels...
Dawson...Eastern Roosevelt...Northern Phillips...Northern
Valley...Prairie...Sheridan...Western Roosevelt.


&&

$$

weather.gov/glasgow


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