* WHAT. Dangerously hot conditions with temperatures of 105 to 115. Limited overnight relief with low temperatures in the upper 60s to mid 80s. Widespread Major to Extreme HeatRisktRisk will result. * 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. From 11 AM this morning to 8 PM PDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. * 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.

* 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 HeatRisktRisk will result. * 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. From 11 AM this morning to 8 PM PDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. * 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.

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

* WHAT. Temperatures in the mid to upper 80s expected. Temperatures near 90 for southeast portions of the city. * WHERE. San Francisco. * WHEN. From 11 AM Tuesday to 7 PM PDT Wednesday. * 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.

* WHAT. Minor coastal flooding expected. * WHERE. Bayside shorelines of San Francisco Bay and San Pablo Bay. * WHEN. Until 11 PM PDT Wednesday. * IMPACTS. Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS. Tidal levels are increasing as a result of higher astronomical tides. Low lying areas within the SF Bay Area may see minor flooding as a result during high tide. Next high tide in San Francisco is at 912 PM on Tuesday at 6.73 ft.