A Twister In Sligo Broadsheet at 3:14 pm May 20, 2012 @CloudAppSoc Beautiful and very rare cloud spotted at sunset in Co. Sligo, Ireland on a surf trip recently. twitter.com/bluefingers/st… — bluefingers (@bluefingers) May 17, 2012 A phenomenon known as Kelvin Helmholtz Instability, apparently. Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window) Related posts: Cumulus? Howth That Happen? Objects In The Side View Mirror DUCK!