Westerlies
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The westerlies, anti-trades, or prevailing westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude. They originate from the high-press
The general atmospheric circulation. Trade winds (red), westerlies (white) and the South Pacific anticyclone (blue)
Roaring Forties
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The Roaring Forties are strong westerly winds that occur in the Southern Hemisphere, generally between the latitudes of 40° and 50° south. The strong eastward air currents are caused by the combinatio
Westerlies
…pattern, making the current more north–south oriented, slowing the westerlies. The strongest westerly winds in the middle latitudes can come in the roaring forties, between 40 and 50 degrees south latitude. The westerlies play an important role in carrying the warm, equatorial waters and winds to the western coasts…
Roaring Forties as they contract towards southern Australia (observed in September 1895).
The Roaring Forties in the Cook Strait of New Zealand produce high waves, and erode the shore as shown in this image
A drawing of a square rigged ship with shortened sail passing through the Roaring Forties