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Month's worth of rain to raise flood risks across southern UK into midweek

By Kristina Pydynowski, AccuWeather senior meteorologist
June 11, 2019, 4:02:08 AM EDT


An unusually wet stretch weather can bring a month's worth of rain to parts of the southern United Kingdom through midweek, raising the dangers of flash flooding.

Rainy spells will continue to stream across southern England and Wales through Wednesday as a storm churns south of the U.K.

Rainfall amounts can average 25-75 mm (1-3 inches) from eastern Wales to the Midlands and southeastern England during this time. One of the highest rainfall totals, 2.38 inches, was recorded in Kenley.

There can be an AccuWeather Local StormMax™ of 100 mm (4 inches), mainly in the corridor from the East Midlands to East England, where the heavy bouts of rain will be most persistent into midweek.

Rainfall totals over the next few days can reach or exceed amounts typically recorded over the entire month of June.

Residents and motorists must remain alert for areas of flash flooding, especially where the rain and thunderstorms unload localised amounts in excess of 50 mm (2 inches).

Average June rainfall generally averages 25-50 mm (1-2 inches) across the southern U.K., including 45.1 mm (1.78 inches) at London's Heathrow Airport.

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London and South East London has already experienced its wettest time period of the week.

A drier Tuesday will unfold in London with a lingering odd shower. There can be an increase in showers around the city at midweek, but the heaviest rain may remain to the north and west.

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More flooding incidents are expected from eastern Wales to the Midlands and northern parts of East England as rainy spells, some of which will be heavy, continue into midweek.

Officials may be forced to close roads that become inundated with water in low-lying and poor drainage areas, as well as along small streams.

Even in the absence of flooding, motorists can face poor visibility amid the downpours. Standing water will heighten the risk of vehicles hydroplaning when traveling at highway speeds.

Most of the northern U.K. will be dry with odd showers through Tuesday. Rain will spread northward to these areas Wednesday into Thursday, but a repeat of the totals received farther south is not expected.

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