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December was an extraordinary month in both meteorological and hydrological terms, with some of the most widespread and severe flooding witnessed in the UK. Slow-moving low pressure systems driven by a sustained moist south-westerly airflow brought prolonged heavy rainfal l to northern and western areas with the persistent unsettled weather (including the named storms ‘Desmond’, ‘Eva’ and ‘Frank’) causing widespread and repeated flooding, bringing significant disruption to transport, utilities and agriculture and flooding over 16,000 homes in England alone. The prolonged and often intense rainfall across a large area of upland northern Britain contributed to unprecedented rainf all totals in many regions. Saturated soils resulting from substantial November rainfall exacerbated the fluvial flooding which followed in December. The spatial scale of sustained very high flows was remarkable; many large catchments in northern Britain recorded their highest ever peak flows and/or monthly mean flows.
England：Severity of the December 2015 floods --preliminary analysis
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