State forecast for S.D.

Today...Sunny and very warm. Slight chance of afternoon thunderstorms west. Highs from the mid to upper 80s northeast and the black hills to the mid to upper 90s western plains.

Tonight...Increasing clouds with a chance of thunderstorms west spreading east late. Lows around 60 far west to near 70 southcentral and southeast.

Friday...Partly sunny and very warm with a chance of thunderstorms...Especially in the afternoon. Highs from 80 to 85 far west to the lower to mid 90s central to southeast.

Friday night...Mostly cloudy with thunderstorms likely east and a chance of thunderstorms west. Lows in the 50s northwest to near 70 southeast.

Saturday...Partly cloudy...Breezy and not as warm. Chance of thunderstorms early far east. Highs in the upper 70s north to 80 to 85 south.

Sunday...Clear to partly cloudy. Lows in the lower 50s northwest to the lower 60s far southeast. Highs around 80 northeast to near 90 southwest.

Monday...Partly cloudy. A slight chance of thunderstorms monday night. Lows in the mid 50s north to near 60 south. Highs in the lower 80s northeast to the lower 90s southwest plains.