How a Pacific typhoon will bring the coldest weather of the season
The whole world is connected in many ways, and in the field of meteorology, we call it teleconnections. Teleconnections are climate or weather patterns that influence other climate or weather patterns large distances away.
El Nino and La Nina are two cases most people have heard of, however powerful typhoons in the Pacific Ocean thousands of miles away can also have an impact on weather across the globe.
Right now, Typhoon Lan is heading toward Japan as a powerful storm. Tropical systems are warm-cored systems, meaning they contain a large amount of warm air. That warm air will get ingested in the jet stream in the northwest Pacific Ocean, which will cause a strong ridge to build. This will push the jet stream north.
Imagine a jump rope, if one end goes up, the other has to go down. In the case of the jet stream, it will dig south over the central Pacific Ocean as a large trough. This will then force the jet stream to build north over the Pacific Northwest of the United States, which will then force the jet stream to dig south over the Central and Eastern United States.
This in return will bring the coldest air of the season across the Midwest, including the Tri-States. Many areas will likely see the first frost and/or freeze and Great Lakes may churn the first lake-effect snow.
It shows how the whole world is connected, even in the field of meteorology.