No fog to obscure the landing. I live a few miles from SFO, beautiful clear day. Planes land from the south bay, where it’s clear. Light fog/overcast in Pacifica/Daly City to the northwest, far from the airport. We heard a loud boom at the time, presumably after the plane struck and the engine burst into flames on the ground. Confirmed by eyewitnesses on site, the boom happened after it slid into the dirt. As I said, beautiful clear sky.
Wonder if this had anything to do with it
Earth’s Pole Has Moved 161 Miles In The Last 6 Months
http://www.freerepublic.com/focus/f-chat/3026501/posts