Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 222337
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
537 PM MDT Mon May 22 2017

.SHORT TERM...for northeast Montana...tonight through Wed...
6PM UPDATE:

A few very light showers are exiting the region to the south and
within a couple of hours will be gone. Clouds will then generally
diminish becoming mostly clear overnight. Very little in changes
were made to the ongoing forecast.   Proton

Previous Discussion:

Radar observations show another round of isolated showers
and possibly an isolated thunderstorm through early evening mainly
east of a line from Jordan to Opheim. Rainfall amounts are
expected to be light generally a few hundredths of an inch.

Drier and warmer weather conditions are expected Tuesday with an
upper level ridge advancing into the region with associated height
rises. High temperatures will return to the mid 70s for a large
portion of northeast Montana late in the day on Tuesday.

For Wednesday an approaching low pressure trough and upper low
will produce a tightening pressure gradient and the possibility
of strong winds in Phillips county with WSW winds possibly
increasing into 35 to 45 mph range with gusts up to 60 mph. For
this reason a High Wind Watch has been issued for Wednesday
morning into early evening. There will be the possibility that
winds will be strong enough across Fort Peck Lake that a Wind
Advisory may be need as well. Stay tuned for additional updates
coming late.


.LONG TERM...Wed night through Mon...
Updates: Chance of precipitation were increased for Thursday as
the main weather system moves across southern Saskatchewan with a
low pressure trough running southward across Montana creating
strong post frontal winds from the WNW. A Lake Wind Advisory for
the Fort Peck Lake area may be needed on Thursday. TC

Previous Forecast...Main feature for midweek on is a strong upper
low swinging across western Canada. Cyclogenesis begins Tuesday
night over Alberta before developing into a stacked low as the
upper trof moves across the Rockies on Wednesday. Cold front
extends southward, moving across eastern Montana during the
afternoon. Moisture somewhat lacking but with good convergence a
few showers or thunderstorms are possible with the frontal
passage.

With the deepening low to the north, strong winds are also
expected behind the front. Models continue to indicate slow
progression of the upper low across Saskatchewan and Manitoba
through the end of the week with blocking low over eastern Canada.
This will keep some potential for showers over mainly the northern
zones with moisture wrapping around the system. Strong winds are
also expected on Thursday with the tight gradient as the low moves
across Saskatchewan.

Upper ridge begins pushing toward the northern Rockies by the
weekend as the Canadian low moves to the east. Some showers are
possible on Saturday before drier and warmer weather returns for
next week. Ebert


&&

.AVIATION...
Flight Category:VFR

Synopsis: Dry conditions are expected tonight with high pressure
building into the region. Winds decreasing this evening and
becoming light overnight. Tuesday winds becoming south 5-10 kts.
Proton


&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
High Wind Watch from Wednesday morning through Wednesday evening
for Central and Southeast Phillips...Northern Phillips...
Southwest Phillips.

&&

$$

weather.gov/glasgow


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