"' William Ferrel "'( 1817 & ndash; 1891 ) was an American meteorologist who developed theories which explained the general mid-latitude atmospheric circulation in detail, now known as the Ferrel cell in his honor.
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A strong high, moving polewards may bring Westerly winds for days . As the high and low pressure zones are established by the Hadley and Polar cells, it can be said that they drive the weather of the middle latitude Ferrel cell.
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The continent Euramerica ( or Laurussia ) was created in the early Devonian by the collision of Laurentia and Baltica, which rotated into the natural dry zone along the Tropic of Capricorn, which is formed as much in Paleozoic times as nowadays by the convergence of two great air-masses, the Hadley cell and the Ferrel cell.
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While the Hadley and Polar cells are truly closed loops, the Ferrel cell is not, and the telling point is in the Westerlies, which are more formally known as " the Prevailing Westerlies . " The Easterly Trade Winds and the Polar Easterlies have nothing over which to prevail, as their parent circulation cells are strong enough, and face few obstacles either in the form of massive terrain features or high pressure zones.
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The page Subtropical ridge hints at a bit more : " The divergence over the near-equatorial trough leads to air rising and moving away from the equator aloft . As it moves towards the Mid-Latitudes, the air cools and sinks, which leads to subsidence near the 30th parallel of both hemispheres . " The impression I get from reading these, and other pages, is that the Hadley cells and the polar cells are the driving forces, while the in-between mid-latitude Ferrel cell exists mainly because the polar and Hadley cells have a gap between them.
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