Low pressure close to and over the British Isles.
Frequent showers and long periods of rain.
Heavy and intense thunder storms.
Friday 20th July 2007 - 80-90mm rainfall = 2 months
Exceeded 25mm in an hour.
120.8mm on the day.
Flat wide floodplain.
Saturated ground from pro-longed rainfall.
Ground couldn't absorb any more water.
Less infiltration, more surface run-off.
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