August 16, 2020 10:36 am Explainer: How Lightning Forms NBC Bay Area meteorologist Vianey Arana explains how lightning forms and why it struck the Bay Area over the weekend. US & World Videos 3:58 Jeff's forecast: Sea level rise outlook into 2100 and what's happening with rain chances this week 2:10 Forecast: Last warm day 2:10 Kari's Forecast: Last warm day 2:42 Jeff's forecast: Cooler rain chance ahead 3:39 Jeff's forecast: 80s to fade, cooler system to bring new rain chances
