* WHAT...Dangerous rip currents and breaking waves due to elevated surf of 4 to 6 feet expected. Very minor tidal overflow and coastal flooding.

* WHERE...Santa Barbara County Southwestern Coast, Santa Barbara County Southeastern Coast, Malibu Coast, and Los Angeles County Beaches.

* WHEN...From Thursday afternoon through Sunday afternoon.

* IMPACTS...There is an increased risk of ocean drowning. Rip currents can pull swimmers and surfers out to sea. Waves can wash people off beaches and rocks, and capsize small boats nearshore. In addition, astronomical tides will be running high, around 7 feet. And with the elevated surf, very minor tidal overflow and coastal flooding will be possible for west and northwest- facing beaches within a couple hours of morning high tides, which will progress from around 7AM PST Friday to between 8AM and 9AM PST by Sunday.

The South Coast AQMD has extended an air quality alert due to increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect until Thursday at 7 PM.

If you smell smoke or see ash due to a wildfire, remain indoors with windows and doors closed or seek alternative shelter, if feasible. Avoid vigorous physical activity and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. If you must be outdoors, keep the time brief and wear a tightly-fitted N-95 or P-100 respirator to help reduce exposure. Limit the use of gasoline powered lawn and garden equipment.

Exposure to particle pollution can cause serious health problems, aggravate lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with heart or lung diseases should follow their doctor's advice for dealing with episodes of unhealthy air quality. Additionally, people with respiratory or heart disease, older adults, and children are particularly susceptible and should avoid prolonged exposure, strenuous activities or heavy exertion as conditions dictate.

Levels of particle pollution can vary hour by hour and by location depending on fire behavior and local weather conditions.

To view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory.