 Heat index values anywhere from 100 to 110, depending on location. It stays very warm and humid this evening. May have to deal with an isolated shower or thunderstorm, although those chances are relatively low. Not many will see them, but if you do come across one, it's not going to last very long, but capable of producing some gusty winds, some heavier downpours. Tomorrow, a newly issued excessive heat warning, 11 a.m. to 8 p.m. Once again, same areas as today.