UK storm forecast: Heavy rain and thunderstorms – flash flooding risk

Weather: Dramatic Thunderstorms and heavy showers forecasted

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Britain has seen the scorching summer heatwave come to a shuddering halt as thunder and lightning, heavy rain and plunging temperatures hit the country. This has prompted the Met Office to issue several yellow weather warnings for rain and thunderstorms on Monday and Tuesday. But any hopes of respite from the horrendous weather have been dashed by forecasters, who have warned of a complete washout over the next few days and the possibility of flash flooding in some places.

The latest weather maps from WXCHARTS show almost the entire UK drowned in persistent rain on Thursday afternoon, with the heaviest battering areas around Edinburgh and Cardiff.

This trend of heavy rain continues on Friday afternoon, with just small regions in East Anglia, the east coast of England and Wales escaping the worst of the treacherous conditions.

On Saturday, there is relief for millions of Britons as the latest weather maps show the rain moving eastwards towards the North Sea, leaving the country relatively dry.

However, this positive hope is again short-lived as a huge band of heavy rain is seen sweeping in north eastwards from the Atlantic towards South East England and Wales.

This will trigger a massive deluge of rain that will spread throughout the UK over the course of Sunday, turning heavy and drowning Britain in the early hours of Monday morning.

The latest maps from Netweather show an extremely high risk of storms engulfing almost all of Britain on Thursday, as temperatures struggle to edge towards 20C heading into the start of next week.

Brian Gaze from The Weather Outlook warned of heavy and thundery downpours over the next few days that could see as much as 5omm of fall in some places.

This will quickly trigger a risk of flash flooding that will cause chaos for millions of motorists, and while it will turn drier on Saturday, the wet weather returns on Sunday “as the remnants of Hurricane Danielle approach the UK”.

Mr Gaze told “Low pressure centred just to our west will keep the weather unsettled during the next few days.

“It brings the likelihood of further heavy and thundery downpours, but they will be quite hit and miss in nature so rain amounts could vary a lot locally.

“In places another 50mm could fall leading to a risk of flash flooding and difficult driving conditions.

“By Saturday the area of low pressure will be pulling away eastwards so there is a good chance of drier weather.

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“Things become more uncertain by Sunday with a growing possibility of it turning wet again from the southwest as the remnants of Hurricane Danielle approach the UK.”

Accuweather Meteorologist Alyssa Smithmyer warned a storm will churn across central and southern parts of the UK throughout the course of this week, with rain and thundery showers smashing into the country.

On Friday, southern and western Wales, southern and western England, and areas of southern and eastern Scotland will be battered by the “heavier storms” while over the next few days, up to 45mm of rain could drown parts of the UK.

She told “Through the end of the week we are expecting unsettled weather across the United Kingdom as a storm slowly churns across central and southern regions from Wednesday to Friday.

“We are forecasting rounds of rain and thundery showers for most of the country through the end of the week, with the possibility for a brief break in the stormy weather on Saturday before additional rain arrives with the next storm.

“Through Friday, the regions expected to receive higher rainfall amounts/potential for heavier storms can be southern and western Wales, southern and western England, and portions of southern and eastern Scotland.

“From Wednesday to Friday, the highest rainfall amounts could reach around 38-45 mm, although amounts ranging from 8-20 mm will be more common across the region over the course of three days.

“Locally higher rain amounts can occur in thunderstorms, which can cause flooding in streets and poor drainage areas.

“Due to how dry the region has been, any rainfall will be beneficial to the drought situation. However, very dry ground will often struggle to quickly absorb heavier rainfall in a short period of time, which can worsen any localised flooding.”

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