November's and December's Picturesque Sunsets and sunrises are no accident. This is the time of year when high cirrus clouds, often the precursors of storms, sweep through our area with some regularity. When cirrus or other lofty clouds are present, low-angle sunlight bathes the undersides of these clouds in a bright-orange or crimson luminescence. This effect is most noticeable a half hour to a few minutes before the sun rises and a few minutes to a half hour after the sun sets.