 For highs in the 90s, heat index values over 100. Strong to severe late-day storms from 4 to 9 p.m. Behind those storms, though, cooler and less humid for Thursday and Friday. Temperatures back in the upper 80s on Thursday. Upper 80s on Friday may be a stray shower or storm Thursday, but most of the day is fine. I'm WTOP's Steve Prince of Alley.