Hello how may I help you? Hi there, could you find something out for me? I can't seem to find info Sure. I'd like to know what the biggest cloud ever recorded was Is it the tallest, widest or heaviest? Find me the heaviest cloud Sure. let me check. Ok, thanks It's the Cumulonimbus cloud. Ok, but when was the biggest cloud spotted? What year? It was the same type of cloud found in Oklahoma. Last recorded on 2017.