In recent years, there has been a concerning increase in clear air turbulence events affecting commercial aircraft, leading to injuries, emergency landings, and even fatalities. Clear Air Turbulence (CAT) occurs at high altitudes and is becoming more common due to climate change intensifying atmospheric conditions. Wind shear, jet streams, temperature gradients, mountain waves, and atmospheric circulation all contribute to the formation of CAT. Studies show a significant rise in the frequency and intensity of CAT conditions over the past few decades, with implications for the aviation industry, costing around $200 million annually in the USA alone. The intensification of jet streams driven by global warming is a key factor in the increase of CAT events.
https://www.flightradar24.com/blog/is-cat-more-common/