How can pilots visually identify the jet stream and associated clear air turbulence in flight?

Pilots can visually identify the jet stream and associated clear air turbulence primarily by observing long streaks of cirrus clouds. These clouds often form in the presence of the jet stream due to the strong winds aloft, which generate upward motion and moisture that leads to cirrus cloud formation. The presence of these high-altitude clouds provides a visual indication of the jet stream's position, as they typically align along the path of the jet stream.

Furthermore, the jet stream is commonly associated with clear air turbulence. This turbulence occurs in clear air, away from thunderstorms, and is often found at the boundaries of air masses with different temperatures and at the edges of the jet stream. While turbulence patterns may also be detected as pilots experience changes in flight conditions, the sighting of cirrus clouds serves as a reliable visual cue for pilots to anticipate areas of potential turbulence related to the jet stream. Other options, such as detecting increased air temperature or looking for dust or haze, do not directly correlate with the identification of the jet stream or clear air turbulence.