First Alert Forecast May 15, 2021 9:40 am First Alert Forecast: Marine Layer Is Back Deeper and more widespread marine layer with cooler temperatures and a chance of light rain. Shanna Mendiola has the forecast for Saturday, May 15, 2021. US & World Videos 3:47 First Alert Forecast: Morning Clouds & Fog 3:03 First Alert Forecast: More Clouds & Fog 3:50 First Alert Forecast: Patchy Fog Returns 3:06 First Alert Forecast: Warm weather ahead 3:07 First Alert Forecast: Patchy clouds and fog