The latest update from the National Weather Service in Sacramento, which provided the graphic::
Low to moderate risk of heat-related illnesses for sensitive groups
Potential for new fire starts due to lightning
High for heat
Low for thunderstorm potential
Timing and Strength
Hot weather with Valley highs near 95-107 through Thursday, cooler for Friday - weekend
Mountain thunderstorms possible each afternoon/evening Tuesday into the weekend. Highest potential Wednesday - Friday.
Hot weather will continue through Thursday before a cool-down is expected for the weekend. Monsoonal moisture may surge north, beginning Tuesday and continuing into the weekend. This may allow for isolated
thunderstorms to develop over mountainous terrain each afternoon and evening, with the highest potential Wednesday - Friday. There is the potential for new fire starts due to lightning and gusty winds with any storm that forms.