There are a lot of great things about living here but summer heatwaves are not one of them. As the high pressure builds here, it will suck the fog off the cool Pacific waters into San Francisco. Eventually the heat breaks and some of that cool air from San Francisco Bay moves up the Delta to relieve us. A lot of people will be fleeing this weekend to the coast or up to the mountains. Last Sunday we were having thunderstorms and plunging temperatures and snow falling on the high mountain passes.