NOAA has issued a Winter Weather Advisory for Montana & Idaho for today and tomorrow that is calling for 4-8″ of snowfall in the high mountains.  Mountain passes will see 1-3″ of snow.

Heck, the snowfall forecast map (4 images down) is showing some zones in Montana forecast to see 8-12″ of snowfall…

“High elevation snow is likely above 6000′ with a slushy inch or two of accumulation (higher amounts of 4-8″ near ridge tops)” – NOAA Great Falls, MT today

“Rain and snow will develop over the mountains on Sunday morning, and gradually change over to all snow for elevations above 6000 feet. The snowfall will be wet and heavy. 1 to 3 inches will be possible over the passes, with the heaviest snowfall near the ridge tops, where 4 to 7 inches will be possible.” – NOAA Great Falls, MT yesterday

Big Sky ski resort in Montana already saw a dusting of snow as of this morning.

WINTER WEATHER ADVISORY for MONTANA & IDAHO:

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1232 PM MDT SAT SEP 3 2016

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM NOON SUNDAY TO
NOON MDT MONDAY ABOVE 6000 FEET...

* IMPACTS/TIMING: AN EARLY SEASON STORM WILL DEVELOP SUNDAY
  MORNING IN SOUTHWESTERN MONTANA AND TRACK NORTH TOWARD CANADA
  MONDAY AFTERNOON. UNUSUALLY COLD TEMPERATURES WILL PRODUCE SNOW
  ABOVE 6000 FEET. AREAS OF CONCERN ARE MAINLY BACKCOUNTRY ROADS
  AND RECREATIONAL AREAS ABOVE 6000 FEET...SUCH AS GEORGETOWN LAKE
  AND SKALKAHO PASS. CAMPERS...HIKERS...AND HUNTERS SHOULD PLAN
  FOR RAW AND WINTRY BACKCOUNTRY CONDITIONS IN THESE AREAS
  STARTING SUNDAY AFTERNOON AND OVERNIGHT INTO MONDAY MORNING.
  LOST TRAIL PASS COULD SEE LIGHT SNOW ACCUMULATIONS FOR BRIEF
  PERIODS OF TIME WITH THE HEAVIER PRECIPITATION...THOUGH EXPECTED
  TO MELT FAIRLY QUICKLY.

* SNOW ACCUMULATIONS: 1 TO 2 INCHES AROUND 6000 FEET WITH 2 TO 5
  INCHES ABOVE 7000 FEET.

* LOCATIONS IMPACTED INCLUDE...HIGHWAY 93 SULA TO LOST TRAIL
  PASS...GEORGETOWN LAKE...MACDONALD PASS