 However based on the terrain loose snow avalanches can grow large, and have been known to carry people off a cliff and into a crevass or bury them in a gully, and even completely destroy houses and other similar buildings.Ideal conditions for a loose snow avalanche are steep slope angles of 40 degrees and more, persistent sub-zero temperatures and low humidity, moderate to heavy snowfall, and also in an area where winds are very light or are not affecting the density of the snow.This produces light, fluffy snow that is hard or unable to pack.