Altocumulus undulatus asperatus (Latin for high-heap undulating agitated) is a proposed variety of altocumulus undulatus independently "discovered" by several humans in the twentieth and twenty-first centuries and proposed to the UN World Meteorological Association in 2009. Should the cloud type be officially recognized, it will be the first new variety since 1951. However, some meteorologists believe these clouds fall under existing altocumulus or altostratus classifications.