The skies above Alabama on Thursday were transformed into a rare display of a cloud known as undulatus, as well as an even more rare and highly prized cloud formation among atmospheric aficionados: undulatus asperatus.
Undulatus asperatus, or turbulent wave clouds, have been the subject of a quixotic advocacy campaign by the UK-based Cloud Appreciation Society, which is a lobbying group for cloud fanatics worldwide.
Social media posts show that the sky was full of undulatus, or “wavy,” clouds above Alabama as a mixture of sleet, snow and rain moved into the region on Thursday morning. Both types of clouds reveal turbulent wave motion of varying amplitudes. …
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Alabama skies covered by stunning wave clouds