Here’s what happened on top of us yesterday, that gorgeous snow day with so many wonderful sights to see. These maps below, courtesy of San Francisco State University , for 500 millibar pressure level, about 18,000 feet above sea level, for 5 AM LST as the snow band moved through Catalina, and then 5PM LST, a little before sunset:
A visual on what the clouds did as this happened yesterday is below. Interpretative cloud statements on the following gallery: shallow, deeper (precip begins in distance), deepest (small, soft hail falls here and there from miniature cumulonimbus clouds), less deep (barely-able-to-precip stage again), shallow, nil. Pics 1,2, 3, 4, 5, and 6, respectively. If you want all the visual glory of yesterday, go to the U of A time lapse movie here. However, you’d better hurry, these wonderful films are overwritten each day. You can really see the clouds flatten out after about 3 PM LST here, and there are some spectacular snow showers going by on the Catalinas.