First Alert Forecast September 23, 2024 4:41 pm First Alert Forecast: Thin Marine Layer High pressure will keep the squeeze on the marine layer for the next few days. Meteorologist David Biggar has the evening forecast for Monday, September 23, 2024. US & World Videos 3:48 First Alert Forecast: Beautiful Weekend 3:45 First Alert Forecast: Coastal Fog 3:29 First Alert Forecast: Cooler Than Average Temperatures 3:18 First Alert Forecast: Cooling down 3:35 First Alert Forecast: Below Normal Temperatures