Area Forecast Discussion
Issued by NWS Glasgow, MT

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000
FXUS65 KGGW 180820
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
220 AM MDT Wed Oct 18 2017

.SHORT TERM...for northeast Montana...today through Thu...

Cold front has moved to the east early this morning. NW winds will
be diminishing as high pressure builds into eastern Montana
today. Plan on canceling the High Wind Warning with the forecast
issuance. Will keep Lake Wind Advisory in effect as winds will
continue to remain above 20 mph until after sunrise.

While temperatures will 15 to 20 degrees cooler than yesterday,
they will be near normal for mid October.

Flat zonal ridge will build into Montana today and move across
Eastern Montana tonight. A weak shortwave trough will move across
southern Saskatchewan late tonight. Mid and high level moisture
within the flow aloft will allow for sct- bkn mid and high clouds
tonight which will keep temperatures on the mild side for lows
tonight.

Flow aloft will turn to the southwest Thursday morning as the
ridge moves to the east and an upper trough moves inland from the
Pacific. Thermal ridge will build back into Montana which will
allow for warmer temperatures mainly in the 70s for highs.


.LONG TERM...Thu night through Wed...

Thursday Night will remain mild as warm air mass is still in
place. Surface low will develop over Alberta Thursday Night as
upper trough continues to move east.

Surface low moves across Saskatchewan on Friday and bring a cold
front across eastern Montana in the afternoon and early evening.
Upper trough follows behind the front Friday Night and Saturday
morning. It looks like there may be enough moisture behind the
front Friday Night and Saturday morning for a chance of showers.

Saturday will be breezy and cooler with west winds as the upper
trough moves to the east during the afternoon.

A shortwave trough and cold front on Sunday will bring strong west
winds to the forecast area. While Sunday looks mainly dry during
the day, another wave on NW flow aloft Sunday Night may have
enough moisture for a chances of showers.

Gusty NW winds are likely on Monday as models bring an additional
wave on NW flow aloft.
Tuesday looks dry at this point with surface high pressure and NW
flow aloft. Models want to build a ridge into the area Tuesday
Night and Wednesday with dry weather continuing. Forrester


&&

.AVIATION...
FLIGHT CAT: VFR.

SYNOPSIS: High pressure will build into eastern Montana today with
diminishing winds. There will be sct mid and high level clouds at
times during the day. Bkn layers of mid and high clouds are
expected tonight as mid and high level moisture moves through the
area with an upper level disturbance.

LLWS: Low level wind shear is possible at times this morning but
will diminish this afternoon.

WIND: NW winds will continue to diminish this morning and back
into a more westerly direction. Wind speeds will be 10 to 20 knots
this morning and around 10 knots this afternoon. Winds will turn
to the south or SE this evening at 5 to 10 knots.

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory until 8 AM MDT this morning For Fort Peck
Lake for Central and Southeast Phillips...Central and Southern
Valley...Garfield...McCone...Petroleum.

&&

$$

weather.gov/glasgow



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