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Roaring Forties

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 combination of warm air being displaced upward from the Equator towards the South Pole, Earth's rotation, and the scarcity of landmasses to serve as windbreaks at those latitudes. On average, winds speeds in the region measure around 10 m/s (22 mph) with peak gusts of over 25 m/s (56 mph).

Dynamics
of New Zealand produce high waves, and erode the shore as shown in this image Hot air rises at the Equator and is pushed towards the poles by cooler air travelling towards the Equator (an atmospheric circulation feature known as the Hadley Cell). ==Use for sailing==
Use for sailing
, taken by ships sailing from Europe to Australia in order to take advantage of the Roaring Forties During the Age of Sail, ships travelling from Europe to the East Indies or Australasia would sail down the west coast of Africa and round the Cape of Good Hope to use the Roaring Forties to speed their passage across the Indian Ocean, then on the return leg, continue eastwards across the Pacific Ocean and south of Cape Horn before sailing up the east coast of the Americas to home. It was first used by Dutch explorer Hendrik Brouwer in his Brouwer Route, discovered in 1611, which effectively halved the duration of the trip from Europe to Java, down from a year or more to 5 months and 24 days. "To run the easting down" was the phrase used to describe the fast passages achieved in the Roaring Forties. Modern round-the-world sailors also take advantage of the Roaring Forties to speed travel times, in particular those involved in record attempts or races. An old sailor's expression goes, "below 40 degrees south, there is no law; below 50 degrees, there is no God." ==Impact of pollution==
Impact of pollution
ged ship with shortened sail passing through the Roaring Forties The peak band of winds has moved approximately 2.5 degrees south in the late 20th century, from a combination of human-induced ozone depletion and greenhouse gas emissions. This has caused faster warming across much of southern Australia (especially in winter) and less rainfall in Western Australia. ==Popular culture==
Popular culture
The story Easting Down by Shalimar describes the events that befall a steamship unwisely venturing into the Roaring Forties to achieve a faster passage. In 1982, French filmmaker Christian de Chalonge directed The Roaring Forties, a drama movie inspired by the death of Donald Crowhurst, a British sailor who perished in the 1969 Sunday Times Golden Globe Race. ==See also==
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