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A drought is a period of drier-than-normal conditions. [1]: 1157 A drought can last for days, months or years. Drought often has large impacts on the ecosystems and agriculture of affected regions, and causes harm to the local economy.
Mechanisms of producing precipitation include convective, stratiform, [6] and orographic rainfall. [7] Convective processes involve strong vertical motions that can cause the overturning of the atmosphere in that location within an hour and cause heavy precipitation, [8] while stratiform processes involve weaker upward motions and less intense precipitation over a longer duration. [9]
The 1988–1990 North American drought ranks among the worst episodes of drought in the United States. This multi-year drought began in most areas in 1988 and continued into 1989 and 1990 (in certain areas). The drought caused $60 billion in damage ($155 billion 2025 USD) in United States dollars, adjusting for inflation.
The 2012–2013 North American drought, an expansion of the 2010–2013 Southern United States drought, originated in the midst of a record-breaking heat wave.Low snowfall amounts in winter, coupled with the intense summer heat from La Niña, caused drought-like conditions to migrate northward from the southern United States, wreaking havoc on crops and water supply. [1]
It is used to inform social and economic policies, including decisions regarding state and local emergency drought declarations, federal funds for farmers and agribusinesses, and other disaster ...
Additionally as drought prediction was essentially random and in response to recent severe drought years, in 1977 the U.S. Department of the Interior, Office of Water Research and Technology contracted Entropy Limited for an exploratory study of the applicability of the entropy minimax method of statistical analysis of multivariate data to the ...
California is the most populous state and largest agricultural producer in the United States, and as such, drought in California can have a severe economic as well as environmental impact. The historical and ongoing droughts in California are caused by lack of rainfall (or snowfall), higher average temperatures , and drier air masses in the ...
Also in drought conditions were Wyoming, Oregon and Arizona. Over the course of 2021, conditions improved in the Northeast but worsened in the Western United States. As of June 2021, "nearly the entire region (97 percent) [was] facing abnormally dry conditions." [5] Drought also affected a wide area of Mexico in 2021, as well as the prairies of ...