The phenomenon mamma or clouds mammatus, a rare but spectacular form clouds, appears before or after the storm. Rybnik, Poland May 4, 2015 <br />Zjawisko mamma albo chmury mammatus, to rzadka lecz spektakularna forma chmury, pojawia się przed lub po burzy. <br />Camera Sony HDR-CX160E Time-lapse Full HD video (1920x1080p) high quality definition
