clear-air turbulence

[ kleer-air ]

noun

1. atmospheric turbulence, sometimes severe, occurring in air devoid of clouds or other visible indicators that turbulence might be present. : CAT

clear-air turbulence

/ klîr′âr′ /

1. Atmospheric turbulence that occurs under tranquil and cloudless conditions at high altitudes near jet streams, mountain ranges, and developing storm systems. It subjects aircraft to strong updrafts and downdrafts.

Word History and Origins

Origin of clear-air turbulence¹

First recorded in 1950–55

Example Sentences

But there is turbulence that neither radar nor pilots can see—clear air turbulence.

From The Daily Beast