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Hi Bailey, thank you for your question. As we mention in the post, historical measurements of teleconnections have been made all over the globe over the last thousand plus years. Unfortunately, much of this information is anecdotal and likely not enough to make any robust conclusions about changes in these teleconnections' magnitudes and positions. To make up for this lack of observed data, scientists run climate model simulations for thousands of years, analyzing terabytes of data to determine how Rossby waves, the jet stream, and subsequent teleconnection patterns have  changed over time both naturally and due to climate change.