Earth’s newest cloud is terrifying

In 2014, I spoke with Gavin Pretor-Pinney, the founder of The Cloud Appreciation Society, about his quixotic mission: to get recognition for a new category of cloud called the “undulatus asperatus.” For years, individuals from across the world had been sending him pictures of the unusual formations, trying to figure out what they were. But they had no official name.
Yesterday, on World Meteorological Day — 9 years after the classification was first submitted — the World M