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2007 United Kingdom floods

Fatal series of natural disasters

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Upton-upon-Severn flooded Interview with ITV (central) King's Head pub television interview 2007 United Kingdom floods Interview with ITV (central)
Iain Cuthbertson · CC BY-SA 2.0

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Through United Kingdom, Precipitation and High-pressure area

June was one of the wettest months on record in the United Kingdom (see List of weather records). Average rainfall across the country was 5.5 inches (140 mm); more than double the June average. Some areas received a month's worth of precipitation in 24 hours. It was the UK's wettest May–July period since records began in 1776. July had unusually unsettled weather and above-average rainfall through the month, peaking on 20 July as an active frontal system dumped more than 4.7 inches (120 mm) of rain in southern England.

Civil and military authorities described the June and July rescue efforts as the biggest in the UK in peacetime. The Environment Agency described the July floods as critical and expected them to exceed the 1947 benchmark.

Meteorological background

June 2007 started quietly with an anticyclone to the north of the United Kingdom maintaining a dry, cool easterly flow. From 10 June the high pressure began to break down as an upper trough moved into the area, triggering thunderstorms that caused flooding in Northern Ireland on 12 June.

Later that week, a slow-moving area of low pressure from the west of Biscay moved east across the British Isles. At the same time an associated occluded front moved into northern England, becoming very active as it did so, with the peak rainfall on 15 June. Rainfall records were broken across the region, leading to localised flooding. As it weakened, the front moved north into Scotland on 16 June and left England and Wales with a very unstable airmass, frequent heavy showers, thunderstorms and cloudy conditions. This led to localised flash flooding and prevented significant drying where earlier rains had fallen.

On 25 June, another unseasonably low pressure (993 hPa / 29.3 inHg) depression, Cyclone Uriah, moved across England. The associated front settled over northern and eastern England and dumped more than 3.9 inches (100 mm) of rain in places. The combination of high rainfall and high water levels from the earlier rainfall led to extensive flooding across many parts of England and Wales, with the Midlands, Gloucestershire, Worcestershire, South, West and East Yorkshire the most affected. Gales along the east coast also caused storm damage. RAF Fylingdales on the North York Moors reported rainfall totals of 4.1 inches (103 mm) in 24 hours, an estimated 3.9 inches (100 mm) in Hull and 3.0 inches (77 mm) on Emley Moor in West Yorkshire. Until 2007, the average monthly total for June for the whole UK was 2.86 inches (72.6 mm).

On 27 June, the Met Office released an early warning of severe weather for the approaching weekend, stating that 0.79 to 1.97 inches (20 to 50 mm) of rain could fall in some areas, raising the possibility of more flooding within the already saturated flood plains.

On 20 July, another active frontal system moved across southern England. Many places recorded a month's rainfall or more in one day. The Met Office at RAF Brize Norton in Oxfordshire reported 4.98 inches (126.6 mm): a sixth of its annual rainfall. The college at Pershore in Worcestershire reported 5.60 inches (142.2 mm), causing the Environment Agency to issue 16 further severe flood warnings. By 21 July, many towns and villages were flooded, with Gloucestershire, Worcestershire, Warwickshire, Wiltshire, Oxfordshire, Berkshire, London and South Wales facing the brunt of the heavy rainfall.

Climate researchers suggested that the unusual weather leading to the floods might be linked to that year's appearance of La Nina in the Pacific Ocean, and to the jet stream being further south than normal.

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