September 21, 2020 4:05 pm What Are Pyrocumulus Clouds? NBC Bay Area Meteorologist Rob Mayeda explains pyrocumulus clouds. US & World Videos 3:40 A closer look: VTA bus attack response 1:49 California's proposed taxpayer protection law causing controversy 5:00 Lawsuit accuses University of California of botching response to employee's sex assault allegation 0:49 Crews extinguish Redwood City fire 2:03 Jury selection begins in state trial against David DePape