* WHAT. Dangerously hot conditions with high temperatures from 105 to 115, locally higher. Limited overnight relief with low temperatures in the mid 60s to mid 80s. Widespread Major to Extreme HeatRisk is expected. * WHERE. Carquinez Strait and Delta, Sacramento Valley, Northern San Joaquin Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills, and Shasta Lake Area / Northern Shasta County. * WHEN. Until 11 PM PDT Tuesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events, particularly for those working outside or participating in outdoor activities. * ADDITIONAL DETAILS. Heat could significantly impact outdoor 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 Delta and western portions of the Sacramento Area early this week.

* WHAT. Hot conditions with high temperatures up to 95-110. Areas of Major to Extreme HeatRisk are expected. * WHERE. Burney Basin / Eastern Shasta County, West Slope Northern Sierra Nevada, and Western Plumas County/Lassen Park. * WHEN. Until 11 PM PDT Tuesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events, particularly for those working outside or participating in outdoor activities. * ADDITIONAL DETAILS. Heat could significantly impact outdoor 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 105 to 110, locally higher. Limited overnight relief with lows mainly in the 70s to lower 80s. Widespread Major to Extreme HeatRisk continues. * WHERE. Central and Northern Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills/Sacramento Valley, and Shasta Lake Area / Northern Shasta County. * WHEN. Until 8 PM PDT Friday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events, particularly for those working outside or participating in outdoor activities. * ADDITIONAL DETAILS. Heat could significantly impact outdoor activities. Area waterways will continue to be cold, creating dangerous conditions for those seeking relief in rivers and lakes.

* WHAT. High temperatures up to 105. Areas of Major to Extreme HeatRisk. * WHERE. Burney Basin / Eastern Shasta County, West Slope Northern Sierra Nevada, and Western Plumas County/Lassen Park. * WHEN. Until 8 PM PDT Friday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events, particularly for those working outside or participating in outdoor activities. * ADDITIONAL DETAILS. Heat could significantly impact outdoor activities. Area waterways will continue to run cold and fast, creating dangerous conditions for those seeking relief in rivers and lakes.