* WHAT. Long period northwest swell will result in an energetic surf zone resulting in an increasing risk of sneaker waves and increasing rip currents, then transitioning to a larger surf with strong rip currents, long beach run-up and large shore break on steeper beaches. Breaking waves of 10 to 14 feet are expected. * WHERE. San Francisco, Coastal North Bay Including Point Reyes National Seashore and San Francisco Peninsula Coast Counties. * WHEN. Through Monday evening. * IMPACTS. Large waves can sweep across the beach without warning, pulling people into the sea from rocks, jetties, and beaches. Sudden immersion in cold water can result in cold water shock even for the most experienced swimmers. Cold water shock can result in dramatic changes in breathing, heart rate and blood pressure, greatly increasing the risk of drowning in rough open waters.

* WHAT. North winds 20 to 30 mph with gusts up to 50 mph expected. Strongest winds are expected across the Delta and far western side of the Central Valley. * WHERE. Carquinez Strait and Delta, Central and Southern Sacramento Valley, Mountains Southwestern Shasta County to Western Colusa County, Northern San Joaquin Valley. * WHEN. From 10 PM Tuesday to 6 PM PST Wednesday. * IMPACTS. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT. Long period northwest swell will result in an energetic surf zone resulting in an increasing risk of sneaker waves and increasing rip currents, then transitioning to a larger surf with strong rip currents, long beach run-up and large shore break on steeper beaches. Breaking waves of 10 to 14 feet are expected. * WHERE. San Francisco, Coastal North Bay Including Point Reyes National Seashore and San Francisco Peninsula Coast. * WHEN. Until 7 PM PST this evening. * IMPACTS. Large waves can sweep across the beach without warning, pulling people into the sea from rocks, jetties, and beaches. Sudden immersion in cold water can result in cold water shock even for the most experienced swimmers. Cold water shock can result in dramatic changes in breathing, heart rate and blood pressure, greatly increasing the risk of drowning in rough open waters.

RED FLAG WARNING IN EFFECT TUESDAY MORNING THROUGH THURSDAY MORNING FOR THE BAY AREA AND CENTRAL COAST AS STRONG OFFSHORE WINDS AND CRITICALLY DRY CONDITIONS ARE EXPECTED TO DEVELOP. .Offshore winds are anticipated to increase early Tuesday morning and persist through Thursday morning. North to northeasterly wind gusts will average between 25 and 50 mph, particularly across the higher terrain of the Santa Cruz Mountains, East Bay Hills, North Bay Mountains, as well as interior portions of Napa and Sonoma counties. In particular, these areas of Napa and Sonoma counties have an increased likelihood of wind gusts in excess of 55 mph late Tuesday and through the day on Wednesday. Afternoon humidity values will fall to between 15 and 25 percent. Overnight humidity recovery will be poor with readings between 25 and 45 percent. The combination of the aforementioned winds and humidity will translate to fires exhibiting a large resistance to control and thereby creating a hazardous and extreme wildfire environment. Fire crews and residents are urged to remain abreast of the weather forecast over the next couple of days. * AFFECTED AREA. Fire Weather Zone 006 San Francisco, Fire Weather Zone 502 Marin Coastal Range, Fire Weather Zone 503 Sonoma Coastal Range, Fire Weather Zone 504 North Bay Interior Mountains, Fire Weather Zone 506 North Bay Interior Valleys, Fire Weather Zone 508 San Francisco Bay Shoreline, Fire Weather Zone 509 San Francisco Peninsula Coast, Fire Weather Zone 510 East Bay Interior Valleys, Fire Weather Zone 512 Santa Cruz Mountains, Fire Weather Zone 513 Santa Clara Valley Including San Jose, Fire Weather Zone 514 Eastern Santa Clara Hills, Fire Weather Zone 515 East Bay Hills, Fire Weather Zone 517 Santa Lucia Mountains and Los Padres National Forest, Fire Weather Zone 518 Mountains of San Benito County And Interior Monterey County including Pinnacles National Park and Fire Weather Zone 529 Northern Monterey Bay. * TIMING. 11 AM Tuesday until 7 AM Thursday. * WINDS. Offshore winds up to or above 25 mph with gusts in excess of 55 mph. * RELATIVE HUMIDITY. Afternoon humidity as low as 15%. Overnight humidity recovery between 25 and 45%. * LIGHTNING. None anticipated. * IMPACTS. Despite recent rainfall, a long duration offshore flow event is anticipated. This will result in the rapid curing of fuels. The combination of strong winds and low humidity will cause fire to rapidly grow in size and intensity. Outdoor burning is not recommended and may be prohibited in some areas.

* WHAT. Northwest winds 15 to 20 kt with gusts up to 25 kt and a light chop expected. * WHERE. San Pablo Bay, Suisun Bay, the West Delta and the San Francisco Bay north of the Bay Bridge. * WHEN. From 9 PM this evening to 3 AM PST Tuesday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. The South Coast AQMD has issued an air quality alert due to harmful levels of particle pollution from windblown dust. * WHERE. in the Inland Empire and Coachella Valley. Levels of particle pollution can vary by time and location depending on emissions and local weather conditions. * WHEN. until 6PM on Monday. * IMPACTS. Particle pollution can get deep into the lungs and cause serious health problems such as asthma attacks, heart and lung disease symptoms, and increased risk of lung infections. Everyone can be affected, but sensitive groups such as people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.