First Alert Forecast June 21, 2024 5:37 pm First Alert Forecast: Dangerous Heat Temperatures jump for Saturday and Sunday. Meteorologist David Biggar has the evening forecast for Friday, June 21, 2024. US & World Videos 2:28 First Alert Forecast: Chilly temperatures 3:05 First Alert Forecast: Cooler Thursday 3:25 First Alert Forecast: Critical fire weather 3:50 First Alert Forecast: Breezy Wednesday 3:42 First Alert Forecast: Winds & Fire Danger