First Alert Forecast March 21, 2024 6:41 am First Alert Forecast: Wrapping up the week Mostly sunny skies. Shanna Mendiola has the forecast for Thursday March 21, 2024. US & World Videos 3:36 First Alert Forecast: More May Gray 3:21 First Alert Forecast: Slowly clearing marine layer 3:37 First Alert Forecast: Cool Wednesday 3:38 First Alert Forecast: More May Gray 3:04 First Alert Forecast: Temperatures in the 70s