June 29, 2018 11:39 pm First Alert: Intense Heat This Weekend Temperatures will soar starting Saturday, and with the humidity the heat index could be in triple digits. First Alert Chief Meteorologist Tammie Souza has the forecast. US & World Videos 2:39 Gloomy Sunday morning expected to clear for sunny afternoon 2:50 One more cool day, then warmer weather ahead 3:15 Cold night, then a big warmup this weekend 3:05 Temperatures to heat up over the weekend 2:05 Warming into the 80s by weekend's end