The summertime morning fog has begun rolling in again. I came vaguely awake early this morning as a morning bus turned the corner at the traffic light below our bedroom. The light was dim and diffuse, and I knew that the fog was hanging a few hundred feet over San Mateo, blocking the sun. There’s cold water welling up from the depths of the Pacific on the other side of the Coastal Range,. It’s making a huge fog bank every morning, and every morning some of that fog drifts inland. In San Francisco, and on the coast side of the hills to the west of us, the fog might be at ground level, but here in downtown San Mateo it hangs above us as low clouds. I love the summertime morning fog. By mid-day, the fog will disperse, exposing us to the relentless California sunshine, and most afternoons the San Mateo Gale will start whipping through town. But summer mornings are dim and cool.