Scientists uncover surprise origin of wispy cirrus clouds

These delicate cloud systems appear to be seeded by massive atmospheric waves thousands of miles away

Cirrus clouds are our highest clouds; their delicate wispy strands are like an artist's brushstrokes through the sky. During the day they are bright white and at dawn and dusk they can take on the hues of sunrise and sunset. But how are they made? New research reveals that some cirrus clouds are seeded by storms on the other side of the world, many thousands of miles away. This has implications for global heating as storm patterns shift.

Meteorologists have long recognised two types of cirrus cloud: anvil" cirrus, which spread out from large storm systems, and in-situ" cirrus, which seem to form on their own. Telling them apart is tricky, but by applying a new computer analysis to cloud satellite data, researchers spotted that in-situ cirrus emerged in response to major storm systems on the other side of the Earth.