On my way home Tuesday night, a brief but intense deluge came down from the sky—a ripping thunderstorm on the first day of summer. I was unprepared, having forgotten to check the National Weather Service on the way out the door in the morning and consequently having also forgotten my umbrella. I was soaked through by the time I got home (a walk of seven minutes or so), but it wasn’t necessarily unpleasant—the temperature was still fairly high so the rain was, instead of cold and miserable, almost refreshing.