Over the Southern Ocean surrounding Antarctica, winds can whip around the globe relatively unimpeded by land. Intrepid sailors termed these southern latitudes the Roaring Forties, Furious Fifties, and Screaming Sixties on account of the strong prevailing winds.
When those winds encounter a barrier like an island, the disruption in airflow can be beautiful. One impediment, shown here, is remote Peter I Island. This ice-cloaked volcano lies at 68.86 degrees south latitude in the Bellingshausen Sea, some 400 kilometers (250 miles) off the coast of West Antarctica and more than 1,800 kilometers (1,100 miles) from Cape Horn, Chile.
On an austral summer day in 2026, the Landsat 8 satellite captured this image of von Kármán vortex streets downwind of the island. These counterrotating spirals form as flowing air is deflected, slows, and spins into eddies. A stiff, but perhaps not quite “screaming,” wind was likely blowing that day. Wind speeds typically need to be 18 to 54 kilometers (11 to 34 miles) per hour for vortices to form. With stronger gales, the eddies cannot maintain their shape. The following day, vortex streets appeared within a complex array of cloud types near the island.
Where the clouds parted around the island, some of its icy edifice became visible to the satellite. A 100-meter-wide circular crater sits at its summit, 1,640 meters (5,380 feet) above sea level. The Smithsonian Institution’s Global Volcanism Program describes the island as a “shield-like volcano,” but there are no records of recent eruptions.
Scientific research on Peter I Island has been limited due to its remote location and the challenging ice conditions surrounding it. The island was discov …