State forecast for S.D.

Severe thunderstorm watch west until 8 pm mdt...

Tonight...Mostly cloudy with scattered thunderstorms west moving east. Severe storms possible west. Lows in the 50s.

Thursday...Partly sunny with a chance of thunderstorms west to south. Highs 80 to 85.

Thursday night...Partly cloudy with a slight chance of thunderstorms. Lows in the 50s.

Friday...Partly cloudy. Slight chance of afternoon thunderstorms west. Highs in the lower to mid 80s.

Saturday...Partly cloudy. Slight chance of afternoon thunderstorms southwest. Lows from 50 to 55 northcentral and southwest to near 60 southeast. Highs in the 80s.

Sunday...Partly cloudy. Slight chance of afternoon thunderstorms west. Lows in the upper 50s to lower 60s. Highs in the 80s.

Monday...Partly cloudy with a slight chance of thunderstorms. Lows in the lower to mid 60s. Highs in the 80s.