The start of October could be a snowy one for Montana. An upper-level low pressure system will be closing off Monday morning north of the North Dakota and Montana boarder. This system will provide the chance for heavy snow into northwest Montana and north-central Montana.
For the Plains it will likely start as rain and change to snow, especially for the later part of Monday. There could be near a foot of snowfall for the mountains and anywhere from 2 to 8 inches for the Plains.
The snow showers are expected to diminish across the region late in the day on Tuesday as the low begins to weaken and break apart.