RENO, Nev. (KOLO) - Heat is the big weather story through Thursday, with triple-digit heat possible across western Nevada. Lake Tahoe and Sierra locations will also be toasty, with highs warming into the mid to upper 80s. A trough of low pressure will dip close enough to cool temperatures Friday through Sunday. Some showers and a few T-storms are possible on Friday, especially in the mountains and afternoon hours.