* WHAT. Hot conditions with high temperatures up to 95-110. Limited overnight relief with low temperatures in the upper 50s to upper 70s. Areas of Major and 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 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.

* WHAT. Hot daytime temperatures near 105 degrees and limited overnight cooling with morning lows in the mid 60s to mid 70s this weekend into next week will result in a prolonged period of Major HeatRisk and heat health impacts. * WHERE. Northern Washoe County, Western Nevada Basin and Range including Pyramid Lake, Greater Reno-Carson City-Minden Area, and Mineral and Southern Lyon Counties. * WHEN. From 10 AM Saturday to 10 AM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events, particularly for those working or participating in outdoor activities.

* WHAT. Hot daytime temperatures in the 90s to near 100 this weekend into next week will result in a prolonged period of Moderate HeatRisk and heat health impacts for those sensitive to heat or those without access to effective cooling. * WHERE. Greater Lake Tahoe Area, Surprise Valley California, Lassen-Eastern Plumas-Eastern Sierra Counties, and Mono County. * WHEN. From 10 AM Saturday to 10 AM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during heat events, particularly for those working or participating in outdoor activities.