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 3:45 Jeff's forecast: Wind calms down 2:17 Forecast: Windy and dry 3:47 Wind advisory in effect for parts of Bay Area 2:14 Kari's forecast: Windy and dry 2:38 Jeff's forecast: Tracking wind gusts
