First Alert Forecast December 10, 2020 5:33 am First Alert Forecast: Return of the Marine Layer Gray skies and cooler temperatures. Belen De Leon has the forecast for Thursday Dec. 10, 2020. US & World Videos 3:44 First Alert Forecast: Nice Weather Continues 3:46 First Alert Forecast: Beautiful Week Ahead 3:18 First Alert Forecast: Breezy Sunday 3:31 First Alert Forecast: Mostly Cloudy Saturday 3:12 First Alert Forecast: Rain this weekend