* WHAT...High temperatures of 92 to 101 degrees expected and overnight low temperatures in the mid 60s to low 70s, with widespread Moderate HeatRisk and areas of Major HeatRisk.
* WHERE...The Sacramento and northern San Joaquin Valleys, Delta and Carquinez Strait, and foothills.
* WHEN...Until 10 PM PDT Thursday.
* IMPACTS...Hot temperatures may cause heat illnesses, especially to anyone without effective cooling and/or adequate hydration.
* ADDITIONAL DETAILS...Hottest days expected Today and Thursday. Temperatures begin a cooling trend on Friday, with Moderate HeatRisk in the foothill thermal belts and in Sacramento; Minor HeatRisk elsewhere.