A Red Flag Warning about potential wildfires also is in effect through at least Wednesday, because of soaring temperatures, gusty winds and low humidity.

The California Independent System Operator issued a statewide Flex Alert for today from 4 to 9pm, calling for voluntary electricity conservation.

County health officials warn that extremely hot weather can result in heatstroke, heat exhaustion, heat cramps, sunburn, heat rash, and in some instances death.