Undulatus Asperatus Over Sampacho, Córdoba, Argentina
March 10, 2016
The photo above shows undulatus asperatus clouds observed over Sampacho, Córdoba, Argentina, on February 16, 2016. Like mammatus clouds, undulatus asperatus are attention getting and look threatening, but they don't necessarily foretell that a severe storm is imminent. In fact, they tend to be seen during the morning hours on days following stormy weather. It's thought that they're related to altostratus undulatus clouds. Look for them over non-mountainous terrain a few hours or so after severe storms have dissipated. Please refer to the Earth Science Picture of the Day for March 8.