First Alert Forecast September 17, 2020 5:29 am First Alert Forecast: An Improvement in Air Quality A ridge of high pressure has been a troublemaker. David Biggar has the forecast for Thursday Sept. 17, 2020. US & World Videos 3:50 First Alert Forecast: Patchy Fog Returns 3:13 First Alert Forecast: Expect sunny and warm temperatures 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