Met Office issues 19-hour yellow thunderstorm warning with London at risk of 'flash floods'

The Met Office has issued a 19-hour yellow weather warning for thunderstorms with thousands of Brits braced for heavy downpours, flooding, and power cuts

The Met Office has issued a yellow weather warning for thunderstorms, with thousands of Britons preparing for heavy rainfall and lightning over the coming two days.

The forecaster has implemented the alert from 3am on Wednesday, encompassing vast areas of England and Wales, including the capital.

Locals have been cautioned about disruption and possible power outages on Wednesday and Thursday, with flooding also anticipated.

Wednesday's warning remains in effect until 10pm and applies to 59 local authorities. An additional yellow warning has been issued from 6am on Thursday.

The forecaster stated there was "a small risk of flooding and disruption from thunderstorms on Wednesday," advising Britons to prepare for potential floods and havoc caused by lightning strikes.

In London, there is a risk of 'flash floods' with up to 50mm of rainfall expected to arrive in the space of just a few hours.

The Met Office cautioned: "Homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes or hail.

"Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services".

British households have been advised to take precautions ahead of the storms and assemble an emergency flood kit, including essentials needed should a power cut occur.

Regarding potential lightning strikes, the Met Office advises: "If you find yourself outside and hear thunder, protect yourself by finding a safe enclosed shelter (such as a car).

"Do not shelter under or near trees, or other structures which may be struck by lightning. If you are on an elevated area, move to lower ground."

Sadiq Khan has advised Londoners to ensure their "insurance covers flooding". The government also urged those in the capital to "put your valuables and important documents on a high shelf" and "learn how to turn off your water, gas and electricity supply".

As well as Greater London several other areas in the South East of England are expected to see downpours.

Warm temperatures are still forecast despite the wet conditions. The forecast for London on Wednesday says: "Cloudy start to Wednesday with heavy or thundery showers. Cloud lifts into the afternoon, bringing some brighter or sunny spells, although scattered heavy or thundery showers still possible. Feeling warm. Maximum temperature 27C."