Mammatus in Nebraska Home » May 30: Smorgasbord of storms » Mammatus in Nebraska Mammatus form in the wake of the squall line in Nebraska on May 30, 2011. Photo by Chris Kridler, chriskridler.com Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name* Email* Website Save my name, email, and website in this browser for the next time I comment. Δ