[noobie]

>It's also the first time SpaceX launches in fog

Musk said the "root cause may have been ice buildup due to condensation from heavy fog at liftoff."

[ridgeguy]

Ice buildup on cryogenic components has been a problem with earlier private launch attempts from VAFB. See [1]for a frozen main LOX valve that didn't fully open due to ice frozen out of humid air.

[1] https://en.wikipedia.org/wiki/American_Rocket_Company