WDEF-TV News 12 Tennessee River Valley weather forecast Overnight: Mostly cloudy. Chilly. Lows: low 50's. Winds: S @ 5-10 MPH. Wednesday: Mostly cloudy. Mild. Highs: mid 70's. Winds: S @ 5-10, gusts to 20 MPH. Overnight: Mostly cloudy. Chilly. Lows:…