(EXTRACTED FROM FXUS66 KMTR 221731) As of 10:31 AM PDT Tuesday for 18Z TAFs. Widespread stratus continues to bring MVFR/IFR ceilings across the San Francisco Bay Area. Visible satellite shows the low clouds beginning to mix-out in the North Bay Valleys as of the 18Z TAF publication time; however, many of the major Bay Area airports remain blanketed. Several terminals will likely stay OVC/BKN through the entire day, and for those that do clear, ceilings will return again overnight. Vicinity of KSFO...MVFR ceilings are expected to prevail through the day as a consequence to the deep marine layer, strong onshore gradient, and healthy stratus feed pushing through the San Bruno Gap from the Pacific. Winds will increase in the afternoon to 15 to 20 kt with higher gusts possible. Ceilings will drop again after sunset, perhaps flirting with IFR levels. SFO Bridge Approach...Could see some SCT/BKN conditions just south of the bridge, though overall expecting similar conditions to that of the terminal. Monterey Bay Terminals...MVFR conditions will likely prevail at KMRY during the day. There's a chance KSNS could transition from MVFR to VRF given sufficient mixing, though opted to take the conservative approach in the TAF. Will continue to monitor and amend if necessary. MVFR/IFR conditions expected overnight.