Damaging wind gusts and large hail are the biggest concerns, with a slightly higher potential in Montana and North Dakota. There is a some risk for tornadoes as well.
A slow moving low pressure center will be the main focus for producing thunderstorms. With warm temperatures and increasing humidity, storms will be able to grow in coverage and intensity due to the building instability. Some supercells may form in the late afternoon and early evening.
Here's the hour by hour forecast in the area of greatest risk for the High Plains, including Montana.
WeatherNation will keep you updated on-air and online with the latest watches and warnings throughout the weekend.
For WeatherNation: Meteorologist Mace Michaels