A slight chance of showers is forecast for Memorial Day in Denver, with the odds of rain and thunder increasing in the afternoon.

Right on time, scattered showers and thunderstorms moved over portions of Montana and Wyoming on Saturday. Isolated activity will be possible Sunday, but Memorial Day Monday should stay warm and dry.

Thunderstorms could threaten motor sports activities at Charlotte Motor Speedway during Memorial Day, forecasters say. Rain, though, should hold off at Indianapolis.