Yes, the jet stream is changing. Studies have shown that, on average, the jet stream is shifting further north in many parts of the Northern Hemisphere. This shift has been linked to climate change. As greenhouse gas concentrations increase, the Arctic is warming faster than the rest of the planet. This difference in warming rates create temperature gradients stronger the temperature differences between the tropics and the Arctic. Stronger temperature gradients produce stronger jet streams.

As the jet stream shifts north, it affects the weather patterns in the regions below it. For example, in the United States, the shift has been linked to more extreme weather events, such as heat waves, droughts, and blizzards in different regions. The shift has also been linked to changes in crop yields and the distribution of plant and animal species.