A FORTNIGHT'S worth of rain will lash Britain in just three hours today as the country is hit by ferocious thunder and hail storms, the Met Office warns.
A "danger to life warning" has been issued for most of England and Wales today, with weather forecasters predicting serious flooding, blackouts and travel chaos.
After an extremely wet weekend saw flooding hit some areas, millions will have to endure more intense downpours due to the storms today.
A spokesman for the Met Office said: "Heavy showers and thunderstorms will continue to spread north-east across England and Wales, while also increasing in frequency during the day.
"In a few places there is the potential for 20mm (0.8in) to 30mm (1.2in) of rain to fall in an hour and 30mm (1.2in) to 50mm (2in) of rain to fall in three hours.
"Hail is also possible, mainly over northern England."
East Anglia and the South East are not covered by the warning, which runs until the end of Tuesday.
The area covered by a weather warning for Wednesday includes parts of Scotland, North Wales, north England and the Midlands.
Homes and businesses are at risk of more flooding over the coming days – while lightning strikes could lead to power cuts.
Temperatures will also nosedive to highs around just 18C – a week after the country endured its hottest day ever with a high of 38.7C.
Weather forecasters fear the predicted floods, lightning, hail and strong winds could spark travel chaos.
The Met Office warned train and bus services may be delayed or cancelled, driving conditions will be difficult and roads could be closed due to flooding.
The thunderstorms and heavy rain may also spark blackouts, with fast-flowing floodwater potentially causing danger to life.
In its weather warning, the Met Office said: "There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds.
"There is a small chance of fast flowing or deep floodwater causing danger to life. Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services.
"Spray and sudden flooding could lead to difficult driving conditions and some road closures. There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost."
A separate warning is also in place for the whole of tomorrow, covering parts of Scotland, North Wales, northern England and the Midlands.
The deluge comes as the Met Office yesterday confirmed that last Thursday really was Britain's hottest day on record.
Cambridge University Botanic Garden measured 38.7C (101.7F), beating the previous UK record of 38.5C (101.3F), set in Kent in 2003.
The new weather warnings follow a weekend of heavy downpours – with half a month's worth of rain falling across parts of the UK leading to travel disruption and floods.
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