What was over Atlanta this morning?
“Undulatus asperatus” clouds.
Cause? Gravity wave packet.
According to Wikipedia:
"Undulatus asperatus (or alternately, asperatus) is a cloud formation, proposed in 2009 as a separate cloud classification by the founder of the Cloud Appreciation Society. If successful it will be the first cloud formation added since cirrus intortus in 1951 to the International Cloud Atlas of the World Meteorological Organization."