We've seen a mix of shelf clouds and undulatus asperatus clouds Tuesday morning. How do they form?

Just north and west of the five boroughs of New York City, no more than a county or two over, frost advisories and even freeze warnings were issued for early this morning. But that's not to say that ...

In last week’s Sunday Science Tidbit, I hinted at a cloud that looks like an ocean wave in the sky. Well this week’s Sunday Science Tidbit is about Undulatus Asperatus clouds. The atmosphere behaves ...

Ramona Edwards emailed these photos of clouds over Huntsville, saying: Undulatus asperatus clouds spotted in Huntsville by Ramona Edwards. There were some really cool “wavy” clouds out this afternoon.

Asperatus — the first "new" type of cloud in decades — is about to get the recognition it deserves in the latest edition of the International Cloud Atlas, the world's top reference book for clouds.

Last night, Facebook and Twitter lit up with pictures of the spectacular hail that briefly fell on the city last night, and sadly wrecked the glass at the Garfield Park Conservatory (update: donate; ...

Whipped into fantastical shapes, these clouds hang over the darkening landscape like the harbingers of a mighty storm. But despite their stunning and frequent appearances, the formations have yet to ...

Social media users have been sharing posts showing an image of an unusual-looking cloud formation. The headlines suggest the photo was taken recently and comments alongside say that kind of formation ...