Snowstorm alert in the US: What states are affected, when will it hit and how long will it last?

Northern Americans prepare for the first heavy snowstorm of winter. The NWS has issued an advisory for snow accumulation of 8 inches to 2 feet, depending on the impacted locations.

Washington, Montana, North Dakota, northwest Wyoming, and northern Idaho will experience colder temperatures and snowfall.

Montana mountains might experience 18 inches of snow, while the northern Rocky Mountains could see 2 feet, according to NWS projections.

The storm will arrive in waves, says the NWS. Since Tuesday, low elevations in Washington have seen rain, while mountainous areas have seen snow, which will move through Idaho, Montana, Wyoming, and North Dakota until Friday morning, October 27.

Multiple rounds of heavy snowfall will hit Montana and North Dakota tonight and Friday morning. 

This area is expected to get more than 8 inches of snow, with higher areas getting 1 to 2 feet. National Weather Service: Snow-covered or icy roads and low visibility will make travel dangerous.