 He says remember to be careful in the heat. Hydrate. Make sure you don't overexert yourself. And before we get to Thursday, which calls for highs in the mid-80s, expect more heat. An excessive heat watch is already in effect for tomorrow for much of the area. This little stretch here should go down in the books from what I can tell as one of our more intense heat waves in the metro area. Mike Murillo, WTOP News.