Undulatus Asperatus clouds

This bizarre undulatus asperatus cloud formation was observed at Escuintla, Guatemala on the afternoon of July 5, 2014.      Image © Julio Meza; Julio’s Web site

The day was rather windy but otherwise no unusual weather was associated with these mid-level clouds. In the few cases where undulatus asperatus have been documented, they’ve been observed to take shape over relatively flat terrain sometime (2 or 3 hours to more than 8 hours) after thunderstorms were reported. In 2009, undulatus asperatus were recognized as a new type of cloud.    Summary Authors: Julio Meza; Jim Foster

source EPOD