It was dawn on Friday, and all night scalding winds had been blowing. Our kids were sleeping on the floor downstairs to stay cool. We don't have AC, and until recently, in the Bay Area, we never needed it. Now, after four years of devastating early fall heat waves, high winds and worsening fires, I realize it's instinctive to keep the kids close on nights like this. We know full well what sweating through a hot windy October night means: Red flag warnings, constant vigilance, waking up to check air quality for signs of smoke. It means keeping an eye on the bag packed by the door.