No it’s not an alien invasion or giant cotton balls. These are Mammatus Clouds caused by turbulence on the underside of cumulonimbus clouds https://t.co/ZrgsI4e50J https://video.twimg.com/ext_tw_video/1780124966458892288/pu/vid/avc1/720x720/xCg-pT-Tksr1k7RR.mp4?tag=12