Droughts

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air masses, in descending to earth, become hotter and drier. When a poleward shift in the west ocurrs, the high-pressure, anticyclonic conditions of the permanently arid regions hit each other on areas that are normally used to seasonally wet low-pressure weather and a drought follows. A southward shift in the western winds causes the most severe drought of the 20th century, the one that struck the African region, Sahel for 12 years starting in 1968.
Statistics indicate that roughly every 22 years a major drought occurs in the United States, they affect the Prairie and midwestern states the most. The disastrous drought of 1933-35, during which large areas of the Great Plains became known as the Dust Bowl, is one example. The effect of the drought was caused cropping, overpopulation, and lack of timely relief measures. In Africa, the Sahel drought was also caused by nonclimate causes such as over cropping.
The types of are Meterological, Agricultural, Hydrological, ...

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