Typhoon Neoguri made landfall in Japan early Thursday.
Some parts of Japan could receive three months’ worth of rain in a matter of two days. This will likely cause flooding and landslides across the country.
This tropical cyclone is bringing large quantities of rain because of its massive size and how slowly it's moving.
Since this typhoon is so large, it will have an affect on weather halfway around the world in the United States.
The jet stream is the main steering mechanism for weather in the northern hemisphere all around the world. Sometimes it travels in a straight, west to east pattern called zonal flow and at other times, it buckles, moving north and south while it travels west to east, called meridional flow.
Typhoons like Neoguri are large enough that they're able to change how the jet stream travels.
In this case, it's going to push the jet stream much farther north than it normally does, creating a ridge. On the other side of this ridge, the jet stream will dive farther south than it normally does, creating a trough.
It just so happens this ridge and this trough will split the United States in two next week.
The western half of the United States will be under the influence of a large ridge, allowing warm air to build, so temperatures will be well above normal there. The eastern half of the country will be within the trough and north of the jet stream, so much cooler air will begin to pour into the Central Plains, Midwest, Mid-South, and Northeast.
This means the West could experience some of their hottest temperatures yet while the eastern half of the country starts to feel more like late spring or early summer.
This won't last forever though. As typhoon Neoguri weakens and dissipates, the jet stream will return to a more normal state, and temperatures won't be unseasonably hot or cold - until the next big storm changes things up.
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