A hazard associated with the jet stream is?

The presence of clear air turbulence is a significant hazard associated with the jet stream due to its high-speed winds at cruising altitudes typically encountered by aircraft. The jet stream consists of fast-moving air currents that can create sudden and unpredictable turbulence, which is often found in clear air, making it difficult for pilots to detect and avoid. Unlike turbulence associated with storms, clear air turbulence typically occurs in regions with no visible weather phenomena, increasing the risk to aircraft that may be flying through or near these currents. Understanding and recognizing the conditions related to the jet stream is crucial for pilots, as it can lead to abrupt altitude changes that may pose challenges during flight operations.