Mammatus clouds are cellular patterns of pouches hanging underneath the base of a cloud, typically a cumulonimbus raincloud. The name derives from the Latin mamma (meaning "udder" or "breast")
— Massimo (@Rainmaker1973) October 5, 2023
These filmed over the Chinese province of Hubei pic.twitter.com/sETii7Zm1W
Yikes
https://www.nbcchicago.com/weather/here-are-the-latest-rainfall-totals-from-the-chicago-area-2/3976010