 It's an alert day with an excessive heat warning that will go into effect later on today, starting around 11 a.m., lasting through 8 p.m. this evening. And that's because it is going to be dangerously hot and humid out there. If you're not taking precautions, heat index values could soar as high as 112 degrees. As we head through the afternoon, look for a partly to mostly cloudy sky and a chance for a few to widely scattered showers and thunderstorms to form, otherwise high temperature of 100 degrees. Tonight, partly to mostly cloudy, warm and muggy with a low of 78.