Thursday, November 14, 2019

Weather Word of the Day: Mammatus Clouds

By: Ryan Fannock

Weather word of the day: 
Mammatus clouds

What are mammatus clouds?

They were first described all the way back in 1894 by William Clement Ley. They are pouches hanging underneath the base of a cloud. You'll see them occasionally attached to cumulonimbus rain clouds; especially after a tornado rolls through an area. We've even seen them in Pennsylvania after severe storms moved through. My first experience seeing these clouds was in Tamaqua after a severe, tornado warned cell meandered across Eastern Schuylkill County. The name mammatus is derived from Latin; it means udder or breast.