Because you can't go home. One of our guilty pleasures during storms is sitting around and looking at live traffic updates to keep track of the mayhem. We snapped this screenshot just now. Accidents and incidents literally every minute? We'd be glad we're taking MUNI except that it's closed at Market at 3rd...

Anyway, as far as we can tell, if you live in Marin and work in Contra Costa, or vice versa, you can't get home because

1) The Richmond Bridge is blocked by a semi
2) 101 is closed in both directions right where it intersects with 580
3) Park Presidio is closed at Lake because of falling trees
4) Doyle is flooded

Unless, of course, you take the windy Napa road. Might as well stock up on vending machine food, commuters! Be safe out there...