Sidney, Montana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

529
FXUS65 KGGW 282046
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
246 PM MDT Sun Jun 28 2026

.KEY MESSAGES...
- Most of the active weather has been winding down today.

- Unsettled conditions remain most of this week with scattered
  showers/thunderstorms.

&&

.DISCUSSION...
WEATHER PATTERN OVERVIEW:
The upper low that moved in that gave the area scattered severe
thunderstorms and flash flooding has generally moved north into
Canada. Scattered showers remain across the CWA and into central
Montana. Temperatures coolest over the NW zones which are closer
to the low pressure, steadier showers and clouds.

The vertically stacked low over southern Alberta, Sask and
northern Montana will remain over the area but is expected to
gradually lift into south-central Canada midweek. This will allow
for a windy day Tuesday, probably enough for a Lake Wind
Advisory.

An upper trough will remain in place over western Canada for the
remainder of the week that will keep the threat of scattered
showers/storms going across northeast Montana. With a hot airmass
just to our south, wouldn`t be surprised if some of these are
severe with large hail and/or damaging wind.

Late in the period, the models try to bring an upper ridge in here
that would bring hotter and drier conditions but the confidence is
low at this point.

FORECAST CONFIDENCE & DEVIATIONS:
No changes to the default/NBM forecast were made today. TFJ

&&

.AVIATION...
UPDATED: 2045z Sunday June 28th

FLIGHT CATEGORY: VFR/MVFR

Clouds and showers will continue to spin counter-clockwise around
an area of low pressure centered just north of Havre. Most of the
ceilings through 18z Monday will be VFR but will lower to MVFR in
heavier showers. An area of MVFR ceilings will also move into the
KSDY airspace Monday morning. TFJ

&&

.HYDROLOGY...

Updated: Sunday June 28th

Rainfall over the past several days seems to have caused very
little impact over the area as of today. Flood Advisory for most
of Phillips and NW Valley counties were allowed to expire at 2 pm.
Otherwise, a Flood Advisory for Daniels expires at 6 pm and the
Flood Advisory for central Garfield county expires at 8 pm.

The Frenchmen River along the Canadian border had risen recently
but has remained nearly steady below Action stage. TFJ


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory until 2 AM MDT Monday for Central and
Southeast Phillips-Central and Southern Valley-Garfield-McCone-
Petroleum.

&&

$$

weather.gov/glasgow