In the PNW (particularly Stevens, Alpental, Crystal) the bumps form over big-ass boulders, so they are irregular in shape and size - and they seem identical from year to year. Early season, as soon as they are covered and the run is opened, there they are again. More snow, more skiers and boarders, the same shapes and spacing only with more snow. It's actually weird for me when I travel and find moguls that are relatively evenly spaced and consistent in size.