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Drought

Weather

World’s wettest rainstorms are getting wetter, affecting flood and drought risk

Events that deliver about half of global rainfall are getting shorter but more intense, with wide-ranging implications The world’s wettest rainstorms produce about half of the global annual rainfall. Now a study shows that these intense downpours have become shorter in duration and fewer in number, compressing the same amount of rain into quicker and more extreme events, with implications for flood and drought risk. Chiyuan Miao and colleagues from Beijing Normal University in China analysed daily measurements between 1980 and 2022 from more than 19,000 rain gauges around the world. They found

Weather

Weatherwatch: soil moisture deficit – how dry are the UK’s thirsty soils?

SMD is the moisture the soil must make up until it is at capacity, with very dry conditions over most of England and Wales When the ground is thoroughly wet, after excess rainwater has run off it is said to be at field capacity. Meteorologists describe drought in terms of soil moisture deficit (SMD) from field capacity. The SMD is a measure of how thirsty the soil is, expressed as how many millimetres of rain it would take to top it up to field capacity. In southern England, the SMD tends to hover around zero in winter when fields are wet. In summer it may be about 100mm, going up to 150mm or

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