Scary footage of pyrocumulus "column collapse" earlier this AM. This occurs when there is temporary interruption in sustained fire updraft strength & air falls rapidly back toward surface--similar to thunderstorm downburst. Extremely dangerous conditions. #CAwx #CAfire #CreekFire https://t.co/m5R9DNVxQF

— Dr. Daniel Swain (@Weather_West) September 6, 2020