* WHAT. Dangerously hot conditions with temperatures 95 to 106 expected and widespread Major HeatRisk. Limited overnight relief with low temperatures in the 60s to mid 70s. * WHERE. Carquinez Strait and Delta, Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills, Northern San Joaquin Valley, and portions of Shasta County. * WHEN. Until 8 PM PDT Thursday. * 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.

* WHAT. A moderate period northwest swell will result in a more energetic surf zone. Breaking waves of 8 to 15 feet will be possible. Given the hot weather inland, area beaches will see increased visitation leading to a higher likelihood of people being swept into the ocean. * WHERE. San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast Counties. * WHEN. Through Thursday evening. * IMPACTS. Large waves can sweep across beaches without warning.

* WHAT. Dangerously hot conditions with temperatures up to 108 expected. * WHERE. San Gorgonio Pass Near Banning. * WHEN. From 10 AM this morning to 9 PM PDT Friday. * IMPACTS. Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.