 Now to 7 News First Alert meteorologist Mark Pena. A mild and muggy start to your morning will give way to a downright hot afternoon with highs right around 100 degrees. Heat index values will be near 110, which is why an excessive heat warning will go into effect at 11 a.m., lasting until 8 p.m. We're also tracking the chance of a few showers and storms later, some of which could be strong to severe. I'm 7 News meteorologist Mark Pena in the First Alert Weather Center.