Large parts of the country could be hit be severe flash flooding when thunderstorms and heavy rain hit later on.
The Met Office has issued an amber 'danger to life' weather warning this afternoon, warning that some communities could be completely cut off 'for several days'.
The weather organisation has warned that a great stretch of the country from Bath and Oxford up to Blackpool, as well as all but the most westerly tips of Wales, are in for a rough evening.
Between 5.40pm and 9pm today millions of Brits could find themselves at risk of flash flooding.
The Met Office warns that there is a good chance heavy rain will lead to flash flooding which could overwhelm roads and sewage systems.
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It is likely the ferocious storm could lead to power cuts.
People in the affected area are advised to be particularly careful when travelling and to avoid unnecessary journeys.
In the worst case scenario fast flowing and deep water could claim people's lives and tear down buildings.
Communities in difficult to reach places have been warned that they may be cut off if the flooding is particularly bad.
Earlier today Chief meteorologist Steve Ramsdale said certain areas could see “exceptional rainfall totals could be seen of 60 millimetres in an hour with a very small chance of 150 millimetres of rainfall in three or four hours”.
The Met Office has warned:
- There is a chance that fast flowing/deep water could suddenly occur, bringing a danger to life and extensive flooding of homes and businesses
- Damage to buildings/structures from lightning strikes, hail, strong winds may occur
- If flooding occurs, road closures with long delays and cancellations to bus and rail services are possible
- Rapidly changing, dangerous driving conditions from spray, sudden flooding, standing water and/or hail might occur
- Power and other essential services, such as gas, water, mobile phone service could be lost
- Communities might be completely cut off, perhaps for several days
Parts of the country have already been battered by serious amounts of rain this week.
Last night Edinburgh was lit up by a huge lightning storm.
On Monday parts of west Wales, including Aberystwyth, enduring flooding following a short period of heavy rain fall.
Fire crews in Lancashire say they were called out to more than 30 flooding incidents overnight in Lancaster, Warton, Kirkham, Hesketh Bank and Tarleton.