 News Talk 790 WNIS News Time 105. Here's your National Weather Service forecast. An excessive heat warning is in effect from 11 a.m. to 8 p.m. Tuesday. For the overnight, mostly clear. Lows in the upper 70s. Southwest winds at 5 to 10 with gusts up to 20 miles per hour. Tuesday, mostly sunny. Highs in the upper 90s. Southwest winds at 10 to 15. Heat index up to 110. It's 85 in Norfolk, 84 on the peninsula.