After a winter snowstorm Cheyenne Wyoming reports a total snowaccumulation of 48

After a winter snowstorm Cheyenne Wyoming reports a total snowaccumulation of 48 cm while the maximum depth in the surroundingcountryside is only 28 cm. If the storms intensity and durationwere practically the same for a radius of 50 km around Cheyenneexplain why Cheyenne received so much more snow.