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 Westerlies and their impact

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meodingu
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PostSubject: Westerlies and their impact   Tue Oct 26, 2010 8:20 pm


Westerlies and their impact

Benjamin Franklin's map of the Gulf Stream
Main article: Westerlies

The Westerlies or the Prevailing Westerlies are the prevailing winds in the middle latitudes between 35 and 65 degrees latitude. These prevailing winds blow from the west to the east to the north of the subtropical ridge,[31][32] and steer extratropical cyclones in this general manner. The winds are predominantly from the southwest in the Northern Hemisphere and from the northwest in the Southern Hemisphere.[24] They are strongest in the winter when the pressure is lower over the poles, and weakest during the summer and when pressures are higher over the poles.[33]

Together with the trade winds, the westerlies enabled a round-trip trade route for sailing ships crossing the Atlantic and Pacific Oceans, as the westerlies lead to the development of strong ocean currents on the western sides of oceans in both hemispheres through the process of western intensification.[34] These western ocean currents transport warm, tropical water polewards toward the polar regions. The westerlies can be particularly strong, especially in the southern hemisphere, where there is less land in the middle latitudes to cause the flow pattern to amplify, which slows the winds down. The strongest westerly winds in the middle latitudes are within a band known as the Roaring Forties, between 40 and 50 degrees latitude south of the equator.[35] The Westerlies play an important role in carrying the warm, equatorial waters and winds to the western coasts of continents,[36][37] especially in the southern hemisphere because of its vast oceanic expanse.





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