first alert weather September 14, 2024 9:09 am Excessive heat warning in effect for Broward and Miami-Dade counties NBC6’s Chelsea Ambriz explains the weather alert. US & World Videos 1:46 6 to know – Top stories of the day 0:42 Video shows FBI swarming music executive's Aventura home 2:12 Broward County first responders launch therapy support dog program 2:04 Miami-Dade County tests voting machines ahead of Election Day 1:46 Children ages 2, 8 and 9 hurt in major crash that killed 94-year-old on Florida's Turnpike