On my original flight from Houston to Buenos Aires I commented on the fact that we hit some turbulence near the equator. It was probably about 2am for me and I was a bit groggy from ativan, so I didn’t really take too much notice. But I thought at the time that it may be related to crossing from the nothern hemisphere down to the southern hemisphere. Clouds in the ITCZ, Photo from Wikipedia Sure enough, there’s a region of unstable air around the equator called the Intertropical Convergence Zone which often causes turbulence for flights crossing between the two hemispheres. Sometimes the turbulence ...