I took a late-day stroll Friday, exploring the neighborhood and enjoying the warm spring air. As the sun sank low in the west, I could see it had potential for a beautiful sunset — streaked cirrus clouds aligned north and south across the sky. So I waited. The air grew cool. The cirrus seemed to disappear. And then warm color rose, first lighting a few scattered cumulus and then revealing the missing cirrus. Just after sunset the sky turned orange, glowing clouds reflected in water, ducks made ripples as they found their nighttime moorings.