Added on: February 22, 2013
Snow pellets or graupel are the cold season’s version of hail. They ordinarily occur during the winter months, but can be seen reaching the surface just about any time of the year at the highest elevations in the Rockies. While they are not a huge threat to pilots other than the potential for a few nicks on the leading edges, they are a sign of deep, most convection that carries a descent amount of supercooled liquid water in the clouds. With a little surface-based instability from a warm ground and cold air pouring in aloft, snow pellets can be the result. In this workshop we’ll look at the atmospheric conditions that can produce snow pellets in association with low-topped convection in southern California.