A drought is characterised by consistently lower than average precipation over a period of time.
Drought appears to have no technical, definite definition beyond this. It is a relative term, defined by the expectations within the area undergoing said
The link below shows a chart that splits the categories of drought into six different sectors. Drought does not only consist of shortages of rain fail, but also vegetation and soil moisture. The six categories that are listed on the chart are vegetation, precipitation, stream flow, soil moisture, Palmers drought index, possible impacts, and a verbal description. There are five different levels of drought that can occur as well. Severity depends on all six categories, not just rainfall/precipitation.
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