Which jet stream is located between 30 and 60 degrees latitude?

The polar jet stream is the correct answer because it is typically found at latitudes between 30 and 60 degrees, primarily in both the Northern and Southern Hemispheres. This jet stream forms at the boundary between the colder polar air and the warmer air from the mid-latitudes. The polar jet stream plays a significant role in influencing weather patterns, including the development of storms and changes in temperature.

In contrast, the subtropical jet stream exists closer to the equator, typically between 20 and 30 degrees latitude, and is a result of the warm, moist air rising and cooling at higher altitudes. The tropical jet stream, which is less well-defined, generally occurs near the equator and is associated with tropical weather systems. The equatorial jet stream, while it exists, is not the dominant feature at the specified latitudes and is primarily concerned with regions near the equator. Thus, the polar jet stream is the one that accurately fits the criteria of being situated between 30 and 60 degrees latitude.