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A
A northeasterly wind flowing out from a high pressure over Sahara which brings a lot of haze to cities in northwest Africa
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B
A warm southerly dust-bearing wind affecting the coast of North Africa.
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C
A localised depression giving squally winds.
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D
A SW monsoonal wind causing extensive areas of advection fog along the West African coast south of 15°N.
Refer to figure.
The harmattan is a northeasterly trade wind strengthened by a low-pressure centre over the north coast of the Gulf of Guinea and a high-pressure centre located over northwestern Africa. The Harmattan is a cool wind which blows mostly during winter.
- It usually carries large amounts of dust, which it can transport hundreds of miles out over the Atlantic Ocean; the dust often interferes with local aircraft operations - may reduce visibility to below 1000 m (especially in areas bordering desert regions). The dust layer may extend to 7000 or 10000 ft or more, and visibility improves towards the coast.
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Greece