* 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.

* WHAT. Dangerously hot conditions with high temperatures 105 to 111 expected. Limited overnight relief with lows mainly in the upper 60s to lower 80s. Widespread Major HeatRisk with localized Extreme HeatRisk. * WHERE. Northern San Joaquin Valley and Southern Sacramento Valley. * WHEN. From 11 AM Wednesday to 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. 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 90 to 105. Moderate 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.