 The WTOP Traffic Center presented by Window Nation. Buy two windows, get two free. Visit windownation.com. Carlos Ramirez, WTOP Traffic. Thank you, Carlos. Now let's go to 70s First Alert meteorologist Mark Pena. Mostly clear skies expected overnight and mild and muggy conditions as well as lows dip into the mid-70s. Now your Monday will feature a bit of a one-two punch. It'll be hot, highs near 100 degrees with heat index values closer to 110 and also a chance at some afternoon showers and storms, some of which could be strong to severe.