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The trade winds or easterlies are permanent east-to-west prevailing winds that flow in the Earth's equatorial region. The trade winds blow mainly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere , strengthening during the winter and when the Arctic oscillation is in its warm phase.
English: Edmond Halley's map of the trade winds, from (1686). "An Historical Account of the Trade Winds, and Monsoons, Observable in the Seas between and near the Tropicks, with an Attempt to Assign the Phisical Cause of the Said Wind". Philosophical Transactions of the Royal Society 16: 153-168.
The westerlies (blue) and trade winds (yellow and brown) The general atmospheric circulation. Trade winds (red), westerlies (white) and the South Pacific anticyclone (blue) [1] The westerlies, anti-trades, [2] or prevailing westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude.
Like trade winds and unlike the westerlies, these prevailing winds blow from the east to the west, and are often weak and irregular. [15] Due to the low sun angle, cold air builds up and subsides at the pole creating surface high-pressure areas, forcing an outflow of air toward the equator; [16] that outflow is deflected westward by the ...
Note that the boundary between the westerlies and the trade winds moves north in summer and south in winter. Portuguese route to India, outbound in red, return route in blue. Northwest Africa: Those sailing from Europe leave the Strait of Gibraltar and soon hit the Canary Current, which pushes them southwest down the African coast.
After using the trade winds to cross the Atlantic in a brisk twenty days, on 15 June, they landed at Carbet on the island of Martinique (Martinica). [161] Columbus anticipated that a hurricane was brewing and had a ship that needed to be replaced, so he headed to Hispaniola, despite being forbidden to land there. He arrived at Santo Domingo on ...
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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. The weaker Westerlies of the Ferrel cell, however, can be disrupted.