UPDATE: This appears to have cleared.
Traffic is slow on Highway 92 west of Skyline because of a downed tree and landslide. 511.org recommends using an "alternate route".
You can see the effect here: http://lcp.sanmateo.org/trip/current.html
It seems to have been cleared.
PFC: 10:20am; AFD: 8:51am
HMB Airport NWS feed from lobitos.net