As you travel from 15°S latitude to 15°N latitude, you would expect to observe changes in the wind direction.
This change is primarily due to the Coriolis effect, which causes winds to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. As you move from the Southern Hemisphere to the Northern Hemisphere, the prevailing wind patterns (such as the trade winds) will shift in their direction, leading to a noticeable change in wind direction.
Additionally, convection patterns may also change, but wind direction is the most direct observation associated with this latitudinal shift.