The miracle of clouds

Clouds moved in after dark Thursday afternoon, and there's been some light snow. The effect on temperatures has been dramatic. Or not. As the plots at the right shows, there has been warming in the lowest 100 meters above the valley floor, cooling 100-400 AGL, and not much change above that. The temperature traces tell the same tale: dramatic warming on the valley floor, and with slight cooling in the hills. It's classic Interior Alaska in the winter.