SAN FRANCISCO (KGO) -- While stunning to even frightening, San Francisco's apocalyptic sky on Wednesday should not scare you.
"Think of the atmosphere as a layer cake. On Wednesday, the Bay Area had a clean air cake with smoky frosting," ABC7 News Meteorologist Mike Nicco said.
The Bear Fire, part of the North Complex Fire in Butte County, exploded to more than 58,000 acres Tuesday night. The massive amounts of ash expelled into the air was trapped between 1500 to 10,000 feet.
The northeast winds that prompted the Red Flag Warning transported an ash saturated air mass directly over the Bay Area.
The ash reflects blue light but allows yellow, orange and red light pass through. As more ash gathered in the sky, it quickly changed from yellow, orange to almost red.
Thankfully, our marine layer (sea breeze) kept pumping clean air below the ash to keep us relatively safe. The sea breeze strengthens Wednesday afternoon into the evening. At worst, only isolated areas on the northern and eastern fringes of the Bay Area could experience unhealthy air.
App users: For a better experience, click here to view the full map in a new window
RELATED STORIES & VIDEOS: