page_title: Roaring Forties
hierarchical_section_title: Roaring Forties
caption_attribution_description: English: View of sediment from New Zealand flowing in the Pacific Ocean. The volume of sediment in the water hints at rough seas. Distinctive plumes arise from pulsing rivers, while the halo of turquoise around both islands is likely sediment swept up to the ocean surface by powerful waves. The plumes fan out and fade from tan to green and blue with water depth and distance from the shore. The Cook Strait, the narrow strip of water separating the North and South Islands of New Zealand, has a reputation for being among the world’s roughest stretches of water. The islands lie within the “Roaring Forties,” a belt of winds that circles the globe around 40 degrees south. The westerlies hit the islands side on and run into the mountain ranges. The Cook Strait is the only opening for the winds, so the channel becomes something of a wind tunnel. Strong winds produce high waves, and they erode the shore as shown in the image.
context_page_description: The Roaring Forties are strong westerly winds found in the Southern Hemisphere, generally between the latitudes of 40 and 50 degrees. The strong west-to-east air currents are caused by the combination of air being displaced from the Equator towards the South Pole, the Earth's rotation, and the scarcity of landmasses to serve as windbreaks.
  The Roaring Forties were a major aid to ships sailing the Brouwer Route from Europe to the East Indies or Australasia during the Age of Sail, and in modern usage are favoured by yachtsmen on round-the-world voyages and competitions. The boundaries of the Roaring Forties are not consistent, and shift north or south depending on the season. Similar but stronger conditions occurring in more southerly latitudes are referred to as the Furious Fifties and the Shrieking or Screaming Sixties.
context_section_description: The Roaring Forties are strong westerly winds found in the Southern Hemisphere, generally between the latitudes of 40 and 50 degrees. The strong west-to-east air currents are caused by the combination of air being displaced from the Equator towards the South Pole, the Earth's rotation, and the scarcity of landmasses to serve as windbreaks.
  The Roaring Forties were a major aid to ships sailing the Brouwer Route from Europe to the East Indies or Australasia during the Age of Sail, and in modern usage are favoured by yachtsmen on round-the-world voyages and competitions. The boundaries of the Roaring Forties are not consistent, and shift north or south depending on the season. Similar but stronger conditions occurring in more southerly latitudes are referred to as the Furious Fifties and the Shrieking or Screaming Sixties.
caption: The Roaring Forties in the Cook Strait of New Zealand produce high waves, and they erode the shore as shown in this image.
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