First Alert Forecast July 31, 2021 11:44 am First Alert Forecast: Warm and Muggy Chance of afternoon storms inland and over SoCal’s deserts and mountains. Shanna Mendiola has the forecast for Saturday, July 31, 2021. US & World Videos 2:08 First Alert Forecast: Memorial Day Weekend 3:42 First Alert Forecast: More Sun by Memorial Day 2:44 First Alert Forecast: Memorial Day weekend weather 3:55 First Alert Forecast: Cloudy Friday 2:53 First Alert Forecast: Clouds into the afternoon