My DH sent me some pics of midwestern weather. Evidently, these clouds produced some world-class hail near Hastings, NE - west of here, near the middle of the state. Come to think of it, Hastings had some pretty significant flooding in early May, too.

Anyway, the link:

http://www.hprcc.unl.edu/nebraska/ju...-mammatus.html

If you see clouds like that, do yourself a favor and get you and your bike under a sturdy roof. You'll be glad you did.