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Photos: Ominous wavelike asperitas clouds loom over Chicago

By Jennifer Fabiano, AccuWeather staff writer
May 10, 2018, 8:35:11 AM EDT

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Chicago, known for the famous Cloud Gate sculpture, was taken over by a different kind of cloud this morning: an asperitas cloud. These dramatic, wavelike clouds loomed over the city as people partook in their daily morning commutes.

An asperitas cloud is the well-defined structure on the underside of the cloud, according to the World Meteorological International Cloud Atlas. The dramatic visual effects stem from the varying levels of illumination and thickness of each cloud.

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The asperitas cloud is a new type of cloud, only being officially accepted into the WMO’s International Cloud Atlas as a new cloud type in 2017.

“Asperitas is a new type of cloud classified in 2017, although it has been shared on social media since the mid-2000s,” Jesse Ferrell, AccuWeather meteorologist and social media manager, said.

“The cloud is rare and occurs at sharp boundaries of dry and moist air,” Ferrell said.


(Photo/Barry Butler)


(Photo/Andrew Hayes)

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