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The different categories of droughts have different causes but similar effects: Meteorological drought occurs when there is a prolonged time with less than average precipitation. [21] Meteorological drought usually precedes the other kinds of drought. [22]
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 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]
Since 2000, climate change has been the primary cause of both the expansion of the drought area and the increase in drought severity, with that percentage rising to over 90% during the drought period.
And just during the past 90 days, many parts of South Florida have been inundated again with between 150% and 200% of average rainfall totals, according to the weather service. Over on the Gulf ...
Also droughts can alter the total amount of freshwater and cause a decline in groundwater storage, and reduction in groundwater recharge. [47] Reduction in water quality due to extreme events can also occur. [48]: 558 Faster melting of glaciers can also occur. [49]
Natural weather systems, for example, can play a key role, as was the case with drought in southern Africa in early 2024. Many countries in southern Africa experienced a prolonged dry period in ...
In 2013 a group of scientists from the Princeton University published a study suggesting that total deforestation of the Amazon rainforest can strongly exacerbate drought conditions in the western states of the USA. According to the study "an Amazon stripped bare could mean 20 percent less rain for the coastal Northwest and a 50 percent ...