Storm snow that increases in density with depth from the surface.
Fresh snow that accumulates with lower density, looser snow on top of denser, more cohesive snow is described as “right-side-up” or “bottom heavy”. If storm instabilities are the only concern, a storm that delivers increasingly lower density snow with time is generally favorable for more stable conditions. Right-side-up storms are the result of snowfall events that get progressively colder and/or less windy as the storm evolves. Thus the snow is fluffier and less slabby at the tail end of the storm.