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The African easterly jet is a region of the lower troposphere over West Africa where the seasonal mean wind speed is at a maximum and the wind is easterly. The temperature contrast between the Sahara Desert and the Gulf of Guinea causes the jet to form to the north of the monsoon trough. The jet's maximum wind speeds are at a height of 3 kilometres (1.9 mi). The jet moves northward from its south-most location in January, reaching its most northerly latitude in August. Its strongest winds are in September while it begins shifting back towards the equator. Within the easterly jet, tropical waves form. Convective complexes associated with these waves can form tropical cyclones. If the jet is south of its normal location during August and September, tropical cyclogenesis is suppressed. If des

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  • The African easterly jet is a region of the lower troposphere over West Africa where the seasonal mean wind speed is at a maximum and the wind is easterly. The temperature contrast between the Sahara Desert and the Gulf of Guinea causes the jet to form to the north of the monsoon trough. The jet's maximum wind speeds are at a height of 3 kilometres (1.9 mi). The jet moves northward from its south-most location in January, reaching its most northerly latitude in August. Its strongest winds are in September while it begins shifting back towards the equator. Within the easterly jet, tropical waves form. Convective complexes associated with these waves can form tropical cyclones. If the jet is south of its normal location during August and September, tropical cyclogenesis is suppressed. If desertification continues across Sub-Saharan Africa, the strength of the jet could increase, although tropical wave generation probably would decrease, which would decrease the number of tropical cyclones in the Atlantic basin. (en)
  • Le courant-jet africain d'Est est une zone de vent fort continu aux altitudes 600, 700 hectopascals (environ 4 kilomètres). Il se situe à environ 7,8° de latitude Nord, et est orienté d'est en ouest. Il a pour origine un fort gradient de température et d'humidité. En été, le golfe de Guinée, victime des remontées de l'hiver Austral reste assez frais, alors que l'Afrique nord tropicale, et les côtes de Guinée, jusqu'au Sahel connaît sa mousson et prend donc des caractéristiques chaudes et humides, et que le Sahara reste chaud, mais extrêmement sec. Il se crée alors un courant-jet orienté est-ouest. Le courant jet est impliqué, par son instabilité, dans la formation des ondes tropicales de mai à octobre. Un lien avec l’oscillation atlantique multidécennale est probable. Lorsque l'Atlantique nord se rafraîchit au profit de l'Atlantique sud, la mousson en Afrique nord tropicale s'affaiblit, provoquant des sécheresses périodiques jusqu'au Sahel. Le courant jet est alors affaibli. (fr)
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  • The African easterly jet is a region of the lower troposphere over West Africa where the seasonal mean wind speed is at a maximum and the wind is easterly. The temperature contrast between the Sahara Desert and the Gulf of Guinea causes the jet to form to the north of the monsoon trough. The jet's maximum wind speeds are at a height of 3 kilometres (1.9 mi). The jet moves northward from its south-most location in January, reaching its most northerly latitude in August. Its strongest winds are in September while it begins shifting back towards the equator. Within the easterly jet, tropical waves form. Convective complexes associated with these waves can form tropical cyclones. If the jet is south of its normal location during August and September, tropical cyclogenesis is suppressed. If des (en)
  • Le courant-jet africain d'Est est une zone de vent fort continu aux altitudes 600, 700 hectopascals (environ 4 kilomètres). Il se situe à environ 7,8° de latitude Nord, et est orienté d'est en ouest. Il a pour origine un fort gradient de température et d'humidité. En été, le golfe de Guinée, victime des remontées de l'hiver Austral reste assez frais, alors que l'Afrique nord tropicale, et les côtes de Guinée, jusqu'au Sahel connaît sa mousson et prend donc des caractéristiques chaudes et humides, et que le Sahara reste chaud, mais extrêmement sec. Il se crée alors un courant-jet orienté est-ouest. (fr)
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  • African easterly jet (en)
  • Courant-jet africain d'Est (fr)
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