* WHAT. Minor coastal flooding. * WHERE. San Francisco and San Francisco Bay Shoreline Counties. * WHEN. Until 11 PM PDT Wednesday. * IMPACTS. Flooding of lots, parks, and roads with only isolated road closures expected.

* WHAT. Minor coastal flooding. * WHERE. San Francisco and San Francisco Bay Shoreline Counties. * WHEN. Until 5 AM PDT Friday. * IMPACTS. Flooding of lots, parks, and roads with only isolated road closures expected.

* WHAT. Temperatures in the mid to upper 80s expected. Temperatures near 90 for southeast portions of the city. * WHERE. San Francisco. * WHEN. Until 7 PM PDT Thursday. * IMPACTS. Those sensitive to heat, such as the homeless, elderly, children, and pets will be at risk for heat-related illnesses. Those without effective cooling and/or adequate hydration will be at the greatest risk. * ADDITIONAL DETAILS. The temperature will vary greatly across the city with the highest temperatures in the SE and downtown and more mild temperatures in the West Side and along

* WHAT. Dangerously hot conditions with high temperatures from 105 to 118. Limited overnight relief with low temperatures in the upper 60s to mid 80s. Widespread Major to Extreme HeatRisk is expected. * WHERE. Carquinez Strait and Delta, Central Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills/Sacramento Valley, Northern Sacramento Valley, Northern San Joaquin Valley, Shasta Lake Area / Northern Shasta County, and Southern Sacramento Valley. * WHEN. Until 11 PM PDT Tuesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS. Heat could significantly impact outdoor holiday activities. Area waterways will continue to run cold and fast, creating dangerous conditions for those seeking relief in rivers and lakes. Delta breeze influence will result in slightly cooler, but still hot temperatures in the Vicinity Delta and western portions of the Sacramento Area by late weekend into early next week.

* WHAT. Dangerously hot conditions with temperatures of 113 to 119 expected. * WHERE. San Gorgonio Pass Near Banning. * WHEN. Until 9 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Conserve electricity and set your air conditioner at a higher temperature * Try to delay trips to the gas station and the use of household chemicals until the evening Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. In the South Coast Air Basin and Coachella Valley, 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. In the Mojave Desert, to view current and forecasted air quality levels, visit the Mojave Desert Air Quality Management District website at mdaqmd.ca.gov. Additional details for this air quality alert may be available at www.mdaqmd.ca.gov/advisories. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, to view current and forecasted air quality levels, visit the San Diego County Air Pollution Control District website at www.sdapcd.org/content/sdapcd/air-quality.html. Additional details for this air quality alert may be available at www.sdapcd.org/content/sdapcd/air-quality/smoke-advisory.html For the latest air quality forecasts and information, visit the website at aqmd.gov.