Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 192007
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
207 PM MDT Sat Aug 19 2017

.SHORT TERM...for northeast Montana...tonight through Sun...

Synoptic Setup: short term begins with hot high pressure over the
lower Intermountain West and butting up against cool Pacific air
over the western half of Canada. This has produces a zonal flow
pattern over the northwestern quarter of the CONUS including
northeast Montana.

This afternoon: With the cold front having just moved through and
the center of high pressure to the northeast over southern
Alberta, wind has risen this afternoon while the pressure patterns
level out. High pressure with cooler air is expected to settle
into northeast Montana by the evening hours allowing winds speeds
to reduce rapidly.

Sunday: Zonal flow will be in place. However hot air to the
southeast will begin smashing up against the exiting cooler air.
While condition should stay stable. Would not be completely
surprise if unstable air to the south generates a rain showers or
two that enters the far southern zones before dissipating. GAH


.LONG TERM...Sun night through Sat...

AFTERNOON UPDATE:
The Drought of 2017 continues...

Blended things today with the latest guidance. Things start off
close to normal temperature-wise then rise above normal levels as
an upper ridge builds in. A trough moving in from western Canada
will increase the chance of showers/thunderstorms about Thursday
Night/Friday. TFJ


PREVIOUS LONG TERM DISCUSSION:
Upper trof over central Canada early next week will give way to a
building ridge through mid week. Another upper trof will push
into western Canada late in the week.

For northeast Montana, a shortwave sliding through the northwest
flow will push a weak cold front through the state early Monday
morning. Could see a few showers with this front and cool
temperatures as high pressure pushes into the northern plains.

Ridge begins building into the northern Rockies on Tuesday.
Temperatures will slowly warm through Thursday as the ridge moves
east. Dry conditions continue under the ridge.

Upper trof lifts across the Canadian Rockies late in the week.
Models differ somewhat on when to push a cold front through
eastern Montana, but cooler temperatures and a few showers are
possible during the weekend. Ebert


&&

.AVIATION...
FLIGHT CAT: VFR.

SYNOPSIS: High pressure is rapidly moving into the area along with
partly cloudy skies.

WIND: northwest at 10 to 20 sustained, gusting 25 kts through the
afternoon... veering to the north to northeast and calming to
less than 10 kts overnight... further veering to the east to
southeast Sunday.

GAH


&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 8 PM MDT this evening for
MTZ120-122-136-137.

Lake Wind Advisory until 8 PM MDT this evening For Fort Peck
Lake for Central and Southeast Phillips...Central and Southern
Valley...Garfield...McCone...Petroleum.


&&

$$

weather.gov/glasgow


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