The city of Chicago has a latitude (42°n) within westerlies part of the global circulation.
The westerlies, also known as anti-trades or prevailing westerlies, are the dominant winds in the middle latitudes between 30 and 60 degrees latitude that blow from the west toward the east. Extratropical cyclones are generally guided in this general direction by these systems, which begin from the high-pressure regions in the horse latitudes and trend towards the poles.
The warm, equatorial winds and waters are transported by the westerlies to the western coasts of continents, particularly in the southern hemisphere due to its huge marine area.
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