Northern California is gonna be really hot tomorrow, because of a high pressure area that will stifle ocean breezes. Sacramento, Fresno, the peninsula are all predicted to get to 99-101, and I suspect that Morgan Hill and other inland areas may get even hotter. The prediction for Concord and the East Bay is 104!!. I expect there may be some power outages as the people and the power grid try to adjust to the sudden heat wave.
A few tips: Get your fans out, and try to remain hydrated. You will need at least a gallon of water over the day if you are at all active. Make sure that the old people have fans or air-conditioning, and access to water.
Be very careful to not leave children or pets in cars even for a few minutes. Babies are gonna be crabby. Make sure they get enough fluids.
Don't be out bike riding on your lunch break, please, and even that daily stroll may be too much for seniors. A wet bandanna does wonders on a hot day.
Make sure your car has adequate anti-freeze, which helps prevent boil-over. If your vehicle engine "temp" light goes on, turn off the air conditioning, turn on the heater full blast, and open the windows. If you get boil-over, get off the highway and open your hood but DO NOT unscrew your radiator cap.
Spare the power grid: if we lose power, then things will really bad for the vulnerable folks. Don't be using your television, oven, toaster, microwave, coffee maker, iron, washer or dryer any more than absolutely necessary. Don't set your air-conditioner to 72...82 would be much better. Things should cool off somewhat by Friday.
On the other hand, you can fry some eggs pretty easily on the pavement, and feel free to get your shorts wet when you water the garden.