When parallel rows of clouds lined up over southwestern Iceland on April 30, 2021, they appeared to be strikingly pretty, but relatively common, wave clouds. Wave clouds are a visible component of waves in the atmosphere, which form for a variety of reasons. According to cloud researcher Bastiaan Van Diedenhoven of SRON Netherlands Institute for Space Research, this is a reasonable explanation for the cloud pattern visible on April 30. The natural-color image on the left—acquired by the Operational Land Imager (OLI) on Landsat 8—shows the clouds as they appeared around midday on April 30, 2021. Throstur Thorsteinsson, a scientist at the University of Iceland, also thinks the cloud waves were probably influenced by the eruption.