Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 200053 AAA

Area Forecast Discussion...UPDATED
National Weather Service Glasgow MT
653 PM MDT Fri Oct 19 2018


Sent an update this evening simply to fine tune the changes in
temperatures and wind speed and direction for the next several
hours. Barely a cloud in the sky. No precipitation expected in NE
Montana over the next 7 days.     --BMickelson

Previous discussion: Afternoon Forecast Update: No significant
changes to the previous forecast package that was created at
around 321 AM MDT.

NE MT is primarily under the influence of an upper level high
pressure system that has been nearly stationary to the west the
passed several days, producing warm and sunny conditions. This
high pressure pattern will continue to bring warm and sunny
conditions into Saturday. Another low pressure trough is forecast
to dropping SE across the high plains of southern Canada, with
this system dropping SE into the north central U.S. As the low
pressure trough approaches the area Saturday afternoon south
southeast winds are forecast to increase and become breezy a head
of the trough. The winds are forecast to shift to the southwest
late in the day before shifting to the northwest Saturday evening
behind the cold front.

Sunday & Monday, a slightly cooler airmass is forecast to be over
the area with high temperatures closer to seasonal values for
this time of the year. Daytime highs are forecast to run from the
mid 50s to lower 60s with mostly clear skies. tec
Previous Forecast Discussion 225 AM MDT FRI Oct 19 2018: A dry
cold front and shortwave trough is currently moving through the
forecast area early this morning. Look for cooler temperatures
with northwest winds and NW flow aloft today. Temperatures will
still be slightly above normal and wind speeds are expected to
stay below lake wind advisory criteria today. Mid and high clouds
associated with this system will clear by afternoon today.

High pressure builds into Eastern Montana this evening diminishing
the winds. Upper ridge moves back into the forecast area on
Saturday with clear skies. With warmer air moving in from the
west, there will be about a 20 degree temperature gradient from NE
(cooler) to SW (warmer) across the region for highs on Saturday.

A weak cold front Saturday Night will cool temperatures mainly in
the southwest for Sunday.

The Western US upper ridge remains over the forecast area between
Sunday and Tuesday with dry weather continuing. Wednesday and
beyond, the ridge moves to the east and models have varying
degrees of waves and troughs moving through but model consensus at
this point is keeping the forecast mainly dry as most of the
moisture stays to the west of the Continental Divide. Forrester




DISCUSSION: Pleasant flying weather continues well through the
TAF cycle, with little to no impact on operations expected. The
region is forecast to be between a low pressure system to the east
over the central U.S. and high pressure to the west, producing
mainly breezy afternoon conditions today and Saturday across
portions of NE MT.

WIND: Light northwest winds tonight will become light and
variable overnight. Winds are forecast to increase Saturday
afternoon from the south at 10 to 20 kts due to the next
approaching low pressure trough. tec/BMickelson




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