Although I usually don't promote the Monopole model, this question is answered by the wider Flat Earth community in the traditional FE model.
The Southern Hemisphere appears to be special place which has much stronger winds than the Northern Hemisphere:
Flights over the Southern Oceanshttp://www.antarctica.gov.au/magazine/2001-2005/issue-4-spring-2002/feature2/what-is-the-southern-ocean “ The Southern Ocean is notorious for having some of the strongest winds and largest waves on the planet. ”
http://www.bbc.com/earth/story/20151009-where-is-the-windiest-place-on-earth “ There are huge belts of wind caused by the uneven way the Sun heats the Earth's surface. 30° north and south of the equator, the trade winds blow steadily. At 40° lie the prevailing westerlies, and the polar easterlies begin at around 60°.
Ask any round-the-world sailor and they will quickly tell you the stormiest seas, stirred by the strongest winds, are found in the Southern Ocean. These infamously rough latitudes are labelled the "roaring 40s", "furious 50s" and "screaming 60s". ”
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2003JD004179 “ The Southern Ocean is a vital element in the global climate. Its circumpolar current plays a crucial role in the global transport of mass, heat, momentum, and climate signals from one ocean basin to another. Moreover, the Southern Ocean hosts the strongest surface winds of any open ocean area, fostering strong heat, moisture, and momentum exchanges between the ocean and atmosphere. However, the Southern Ocean is tremendously undersurveyed by traditional observation methods because of the remoteness of the area and rough environment, causing the largest data gap of global oceans. ”
Jeran shows that the winds and Jet Streams in the Southern Hemisphere are stronger than the Northern hemisphere:
Flat Earth - Ending Southern Hemisphere Objections (Runtime: 2m)
Further, there are both Eastwards and Westwardly traveling currents in the Southern Hemisphere:
South Pacific Gyrehttp://thejunkwave.com/what-is-a-gyre/Jet Streams Enable Faster Than Sound Flighthttps://www.wired.com/story/norwegian-air-transatlantic-speed-record/ “ OK, about that "subsonic" bit. You might know that the speed of sound at an altitude of 30,000 to 40,000 feet is roughly 670 mph. But Norwegian’s planes didn't break the sound barrier. Those near-800-mph figures represent ground speed—how fast the aircraft is moving over land. Their air speed, which factors out the 200-mph wind boost, was closer to the 787's standard Mach 0.85. (The older Boeing 747 can cruise at Mach 0.86, but is less efficient than its younger stablemate.) When talking supersonic, and breaking sound barriers, it's all about the speed of the air passing over the wings, which in this case was more like 570 mph. ”