There are very clear correlations. The scientists aren't pulling the association out of thin air, it's observed. We have satellites that watch the atmospheric currents and temperature fluctuations, how those drag different temperatures of air to different areas, and back engineer why things are moving the way they are.
The primary example is the weakening of the Arctic air currents causing the cold air to escape. The Arctic then warms faster, and causes short-lived, dramatic drops in temperature in the north Midwest.
We do similar back-engineering with the dry spells on the west coast.
The largest computers in the world are routinely used to simulate the weather and predict changes climate change will cause, and we are getting more and more accurate every year.
The primary example is the weakening of the Arctic air currents causing the cold air to escape. The Arctic then warms faster, and causes short-lived, dramatic drops in temperature in the north Midwest.
We do similar back-engineering with the dry spells on the west coast.
The largest computers in the world are routinely used to simulate the weather and predict changes climate change will cause, and we are getting more and more accurate every year.