* WHAT...Hot conditions with maximum temperatures in the low-80s to low-90s. Mild minimum temperatures and weak onshore flow will limit overnight relief.
* WHERE...The Marin Hills, San Francisco, and Northern Salinas Valley/Hollister Valley and Carmel Valley.
* WHEN...From 11 AM this morning to 10 PM PDT Sunday.
* IMPACTS...This level of heat affects anyone without effective cooling and/or adequate hydration. Impacts likely in some health systems, heat-sensitive industries and infrastructure.