First Alert Forecast May 21, 2020 5:20 am First Alert Forecast: Temperatures on the Rise Temperatures are heating up. Shanna Mendiola has the forecast for Thursday May 21, 2020. US & World Videos 3:31 First Alert Forecast: Mostly Cloudy Saturday 3:12 First Alert Forecast: Rain this weekend 3:46 First Alert Forecast: Weekend Sprinkle Chance 3:47 First Alert Forecast: Morning Clouds & Fog 3:03 First Alert Forecast: More Clouds & Fog