We just had a low pressure system move out of the San Diego area before this High Pressure system moved in. When this High took over air from higher in the atmosphere sinks down to fill the space left as air blew outward. This day we had a Red Flag Warning Issued in San Diego County Due to Elevated Fire Risk. With the combination of high temperatures, gusty winds( up to 60mph) and low humidity this is what can be seen occasionally in this region of the world.

 Dude, the color of the sky, in all the pics from this day, is insane! Did you use a filter or was the sky a crazy blue?