A growing wave of clear-air turbulence incidents on commercial flights is forcing airlines, regulators and meteorologists to rethink how aviation weather is forecast, with new research published in 2024 and 2025 suggesting that climate change is materially altering the skies pilots fly through. The latest data, drawn from multiple atmospheric science teams in the United Kingdom and United States, shows that severe turbulence on transatlantic routes has increased by roughly 55% since 1979 — a trend that experts say will only accelerate as the upper troposphere continues to warm.
The renewed focus on aviation meteorology follows a series of high-profile turbulence events, including the fatal Singapore Airlines flight SQ321 incident in May 2024 and several injury-causing episodes on Hawaiian, Qatar and United Airlines flights. These events have pushed clear-air turbulence — invisible to the naked eye and to conventional onboard radar — to the top of the agenda at the International Civil Aviation Organization and at national weather services that produce flight-level forecasts.
Why Clear-Air Turbulence Is Getting Worse
Clear-air turbulence, or CAT, occurs most often near the jet stream, where strong vertical wind shear can suddenly destabilise otherwise smooth air. Unlike turbulence associated with thunderstorms or mountain waves, CAT leaves no visible signature, making it notoriously difficult for pilots to anticipate. Atmospheric scientists at the University of Reading, led by Professor Paul Williams, have linked the rise in such events to a strengthening of vertical wind shear in the North Atlantic jet stream — a direct consequence of the uneven warming between the tropics and the poles. Their findings, summarised by the [UK Met Office](https://www.metoffice.gov.uk), indicate that moderate-or-greater turbulence is now significantly more common on busy long-haul corridors than it was four decades ago.
The mechanism is rooted in basic dynamic meteorology. As greenhouse gases trap more heat in the lower atmosphere, the stratosphere cools while the mid-latitude upper troposphere warms unevenly. This sharpens temperature gradients near 30,000–40,000 feet — precisely the altitudes where most jet aircraft cruise — and intensifies the wind shear that generates turbulent eddies. According to a study highlighted by the [American Geophysical Union](https://www.agu.org), the frequency of severe CAT could double or even triple over the North Atlantic by mid-century under high-emissions scenarios.
How Forecasting Is Evolving
In response, numerical weather prediction centres are deploying higher-resolution models that better resolve the small-scale gravity waves and shear instabilities responsible for CAT. The U.S. National Oceanic and Atmospheric Administration’s Aviation Weather Center has expanded its Graphical Turbulence Guidance product, while European centres are integrating machine-learning algorithms trained on automated pilot reports and aircraft-derived eddy dissipation rate data. Aviation regulators are also pressing for more widespread adoption of in-situ turbulence reporting systems, which broadcast real-time intensity measurements from commercial aircraft back to forecasters and other flights in the area. More information on these operational tools is available through the [NOAA Aviation Weather Center](https://www.aviationweather.gov).
Airlines, meanwhile, are revising operational procedures. Several carriers have shortened seatbelt-sign discretion windows, ended certain in-flight services earlier in cruise, and updated dispatch software to flag higher-risk routes. Insurers are watching closely: turbulence-related injury claims now represent one of the fastest-growing categories of aviation liability, according to industry briefings released earlier this year.
Significance for Passengers and the Industry
The story matters beyond passenger comfort. Turbulence costs the global aviation sector an estimated $150–500 million annually in injuries, inspections, diversions and structural fatigue on airframes. As routes lengthen and traffic recovers past pre-pandemic levels, even small percentage increases in CAT encounters translate into substantial operational and human costs. The push for sharper aviation meteorology is therefore not merely academic — it is becoming a core safety and economic priority.
What to watch next: the World Meteorological Organization is expected to release updated guidance on turbulence forecasting standards in the coming year, while several airlines are trialling LIDAR-based forward-looking turbulence detection systems that could finally give pilots a few seconds of warning before encountering CAT. If those technologies mature, they may represent the first genuine onboard breakthrough against a hazard that has, until now, been almost entirely invisible.
For more reporting on atmospheric science, climate research and the technologies shaping how we understand the sky, visit science.wide-ranging.com for related stories and deeper analysis.
