First Alert Forecast September 20, 2020 8:26 am First Alert Forecast: Cooler Days as Fall Approaches There will be cooler days ahead as fall approaches. Shanna Mendiola has the First Alert Forecast Sept. 20, 2020. US & World Videos 3:06 First Alert Forecast: Warm weather ahead 3:07 First Alert Forecast: Patchy clouds and fog 2:59 First Alert Forecast: Windy Friday with possible showers 3:46 First Alert Forecast: Windy Friday 2:51 First Alert Forecast: Cooler weather lingers before weekend warm-up