* WHAT...Dangerously hot conditions with temperatures 95 to 107 possible and widespread major HeatRisk. Limited overnight relief with low temperatures in the 60s to mid 70s.

* 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 Tuesday morning through Thursday evening.

* IMPACTS...Heat related illnesses increase significantly during extreme heat events, particularly for those working or participating in outdoor activities.

* ADDITIONAL DETAILS...Hottest temperatures are expected Wednesday. Area waterways will continue to run cold and fast, creating dangerous conditions for those seeking relief in rivers and lakes.