From Meteorologist David Stradling:
Friday storm chances
Scattered cloud cover will move over the area tonight. An isolated storm will be possible in southeast Montana and northwest South Dakota.
Mostly cloudy skies will continue on Friday. It looks to be dry much of the day, though an isolated storm cannot be ruled out during the afternoon. Storms will be more widespread during the evening hours. Some storms may be strong to even severe. Highs Friday will top out in the 70s for many with a few 80s toward the eastern plains.
For the weekend, it is looking pretty dry. Skies will become mostly sunny on Saturday with highs in the low 80s. Sunday will be partly cloudy with highs near 80°. Cooler air returns Next week with highs in the 70s and plenty of sunshine.