* WHAT. Temperatures are going to warm significantly as we head into the 4th of July weekend with afternoon highs 90 to 95 degrees in most valley areas, locally to 105+ degrees across the hotter Chalfant Valley in Mono County and the Honey Lake area including Susanville in northeast CA. While overnights will cool briefly, these daytime temperatures will be at record levels and very unusual even for summer. This will result in a prolonged period of Moderate HeatRisk. * WHERE. Greater Lake Tahoe Area, Lassen-Eastern Plumas-Eastern Sierra Counties, and Mono County. * WHEN. From 10 AM Saturday to 10 AM PDT Wednesday. * IMPACTS. This extended period of hot weather may cause heat illnesses, especially for those with no access to air conditioning.

* WHAT. Temperatures are going to warm significantly as we head into the 4th of July weekend with afternoon highs 90 to 95 degrees in most valley areas, locally to 105+ degrees across the hotter Chalfant Valley in Mono County and the Honey Lake area including Susanville in northeast CA. While overnights will cool briefly, these daytime temperatures will be at record levels and very unusual even for summer. This will result in a prolonged period of Moderate HeatRisk. * WHERE. Greater Lake Tahoe Area, Lassen-Eastern Plumas-Eastern Sierra Counties, and Mono County. * WHEN. From 10 AM Saturday to 10 AM PDT Wednesday. * IMPACTS. This extended period of hot weather may cause heat illnesses, especially for those with no access to air conditioning.

* 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. 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 is expected. * WHERE. Burney Basin / Eastern Shasta County, West Slope Northern Sierra Nevada, and Western Plumas County/Lassen Park. * WHEN. From 11 AM this morning to 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.