Droughts are periods of below average rainfall in a particular area. They’re caused by changes in weather patterns that result in less precipitation. High pressure systems, for example, result in sunny rain-free weather because they do not allow water vapor to rise and condense, which forms rain. If a high pressure system remains over an area for a long time, the area will experience drought.
Essentially, droughts are caused by depreciating precipitation over a period of time. It can take decades for a drought to occur which makes them difficult to predict. Droughts can be mild and almost undetected or they can be life threatening and severe.
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