155 AM PDT Tue Jun 29 2021 Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 155 AM PDT Tue Jun 29 2021 .NOW...Visibilities 1/2 mile of less are being observed along most of the coast. These reduced visibilities will likely continue through mid-morning. Motorists are urged to slow down and proceed with caution. Never use high beams and leave plenty of distance between you and the vehicle in front of you. In dense fog, you have seconds to react.