Imagine your sat on an office chair and you spin round really fast.
If you stuck your legs out you slow down and if you tuck in you speed up. This is because your legs conserve momentum and as they go further out they need more engery to turn at the same speed.
As the air in a hurricane moves north it still has a lot of momentum fron the earth spinning and unlike your legs isnt connected to anything so it can speed up itself.
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