What are the fastest and strongest global winds called?

The fastest and strongest global winds are called jet streams. They are narrow bands of powerful air moving high in the atmosphere, generally from west to east, near the boundaries between major air masses.

Jet streams form because warm and cold air create strong temperature differences. Earth’s rotation, through the Coriolis effect, bends these rapidly moving winds into mostly west-to-east paths. The strongest jet streams are found roughly 8 to 14 kilometers above Earth’s surface.

The polar jet stream and subtropical jet stream are the best-known examples. Their position and strength influence storms, temperature patterns, and aviation routes. Commercial aircraft can save time and fuel when flying with a jet-stream tailwind, while headwinds can lengthen a trip.

A common mix-up is confusing jet streams with surface winds or hurricanes. Jet streams are high-altitude atmospheric currents, not individual storms, although they can help steer and intensify weather systems.