First Alert Forecast August 20, 2024 4:38 pm First Alert Forecast: Cooler Weather on the Way After a hot Tuesday, temperatures are set to cool for the rest of the week. Meteorologist David Biggar has the evening forecast for Tuesday, August 20, 2024. US & World Videos 3:31 First Alert Forecast: Red flag warning 2:54 Return of Santa Ana winds brings fire threat with it 3:20 First Alert Forecast: Quiet Weekend Before Winds Return 3:29 First Alert Forecast: Cooler and humid 3:51 First Alert Forecast: Diminishing winds