Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 182126

Area Forecast Discussion
National Weather Service Glasgow MT
326 PM MDT Wed Oct 18 2017

.SHORT TERM...for northeast Montana...tonight through Thu...
Flat zonal ridge will move across the area tonight and exit into
the Dakotas Thursday morning. 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 tonights low temperatures on
the mild side.

Flow aloft will swing from a westerly direction into a more
southerly direction as a high pressure ridge moves to the east
and an upper trough moves inland from the Pacific NW. A thermal
ridge is forecast to build back over Montana allowing for a rapid
rebound in high temperatures mainly in the 70s.

.LONG TERM...Thu night through Wed...
Thursday Night:
Overnight low temperatures are forecast to remain mild. A surface
low is forecast to develop over SE Alberta Thursday Night as an
upper low pressure trough move in from the west.

A low pressure trough and surface cold front is forecast to move
across the area during the afternoon into the early evening. An
upper level trough moves through Friday Night into early Saturday
morning with strong WNW winds 15 to 25 mph and gusts from 40 to
50 mph. There will be enough moisture behind the front Friday
Night for a chance of showers.

Windy WNW winds and cooler conditions can be expected on Saturday
with high temperatures dropping back near normal.

A shortwave trough and cold front will continue the strong WNW
winds across the forecast area. This system will bring with it
isolated to scattered light showers.

Monday into Tuesday:
Monday NE MT is forecast to remain on the back side of a strong
and cold low pressure system centered over Hudson Bay with cool
and breezy NW winds and some widely scattered light rain showers.
Tuesday - A high pressure ridge is forecast to begin building in
from the west with warming daytime high temperatures and
decreasing NW winds at this point.

Wednesday: A High pressure ridge is forecast to build over the
region with dry and warmer daytime temperatures along with lighter
winds. TEC



SYNOPSIS: High pressure over the region through Friday morning,
then exiting towards the Dakotas/Minnesota on Friday, with the
next weather system moving into the Pacific NW. There will SCT-
BKN layers of mid and high clouds expected tonight as moisture
moves through the area with an weak upper level disturbance.

WIND: Winds will turn to a more southerly direction this evening
at 5 to 10 knots, and increase late Thursday morning into the
afternoon 10 to 20 knots.


Red Flag Warning until 6 PM MDT this evening for MTZ120.


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