A drought is an extended period of months or years when a region notes a deficiency in its water supply. Generally, this occurs when a region receives consistently below average precipitation. It can have a substantial impact on the ecosystem and agriculture of the affected region.
Generally, rainfall is related to the amount of water vapor in the atmosphere, combined with the upward forcing of the air mass containing that water vapor. If either of these are reduced, the result is a drought. This can be triggered by an above average prevalence of high pressure carrying continesntal, rather than oceanic air masses (i.e. reduced water content), and ridges of high pressure area form with behaviors which prevent or restrict the developing of thunderstorm activity or rainfall over one certain region.n persist for several years, even a short, intense drought can cause significant damage and harm the local economy.
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