Moderate

* WHAT...Visibility less than one quarter mile in patchy dense fog. * WHERE...Del Norte and Northern Humboldt Coast. Fog will be patchy and visibility may change dramatically. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Allow extra time to reach your destination. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...High temperatures of 95 to 105 with overnight temperatures in the high 50s and 60s. Moderate to localized Major HeatRisk. * WHERE...Mendocino Interior, and Lake County. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...For the High Rip Current Risk, dangerous rip currents expected. For the High Surf Advisory, large breaking waves of 4 to 6 feet expected in the South Carolina surf zone and 5 to 7 feet expected in the Georgia surf zone. * WHERE...South Carolina Beaches, and Georgia Beaches. * WHEN...For the High Rip Current Risk, through this evening. For the High Surf Advisory, from noon today to 2 PM EDT Wednesday. * IMPACTS...Dangerous swimming and surfing conditions and

* WHAT...Dangerously hot conditions with temperatures around 90 near the coast to 103 inland. * WHERE...San Luis Obispo County Inland Central Coast, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Barbara County Inland Central Coast, Santa Lucia Mountains, Santa Ynez Valley, and Southern Salinas Valley. * WHEN...Until 8 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of

* WHAT...Temperatures of 80 to 95 degrees expected. * WHERE...San Luis Obispo County Beaches and Santa Barbara County Central Coast Beaches. * WHEN...From 10 AM Wednesday to 8 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...Hot conditions with maximum temperatures in the mid-90s to near 105. Mild minimum temperatures and weak onshore flow will limit overnight relief. * WHERE...The East Bay and San Francisco Bay Shoreline, North Bay Interior Mountains and Valleys, The Santa Clara Valley and Eastern Hills, The Santa Cruz Mountains, Interior Monterey County and the Santa Lucia Range, Most of San Benito County and the Cholame Hills in Southeast Monterey County, and Southern Salinas Valley/Arroyo Seco and Lake San Antonio.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast, Northern Monterey Bay, and Southern Monterey Bay. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. If commuting, allow extra drive time to reach your destination safely.

* WHAT...North winds 20 to 30 kt with gusts up to 35 kt and very steep and hazardous wind-driven seas 7 to 11 ft. * WHERE...All areas. Very steep and hazardous seas are expected from Gold Beach southward during the evening and overnight periods. * WHEN...For the Small Craft Advisory, until 5 PM PDT Wednesday. For the Hazardous Seas Warning, from 8 PM this evening to 5 PM PDT Wednesday. * WHEN..From 11 PM Sunday to 11 PM PDT Monday. * IMPACTS...Very steep and hazardous seas could capsize or

* WHAT...For the Beach Hazards Statement, dangerous rip currents expected. For the Coastal Flood Advisory, minor coastal flooding expected. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...For the Beach Hazards Statement, from this afternoon through Friday evening. For the Coastal Flood Advisory, from 6 AM Wednesday to 11 AM PDT Friday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Minor coastal erosion is also

Patchy to more widespread fog development will be possible through sunrise this morning. At times the fog could become dense, restricting visibilities to less than a half to a quarter of a mile in areas. The fog should lift after by 9 AM. While driving this morning, be alert for rapid changes in visibilities over short distances. Be sure to slow down, use low-beam headlights, and leave extra distance between you and the vehicle in front of you.