Storms are expected to hit large swathes of the country in the next two days causing widespread disruption, the Met Office has warned.
Huge areas of the west of the UK are due to be hit from 1.30pm today including Glasgow, Cardiff, Belfast, Manchester and Birmingham.
The yellow weather warning that is in place until 6am tomorrow is then replaced by an even bigger alert covering central and parts of the east of the UK, which lasts until 9pm Thursday.
The second warning takes in all the towns and cities affected on Tuesday, but also adds Lincoln, Nottingham, Oxford, Leicester and Cambridge to the firing line.
The Met Office warns that thunderstorms could cause flooding and disruption.
The alert reads: "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.
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"There is a small chance of fast flowing or deep floodwater causing danger to life."
It adds that some delays and cancellations are likely to train and bus services as well as hazardous driving conditions and some road closures.
The weather experts also warned there could be the chance of power cuts, and some smaller communities could be cut off.
By Thursday afternoon, just the south will still be affected by rain, from as far west as Exeter, through Taunton, Salisbury, Portsmouth and Brighton, and stretching east to Canterbury.
The yellow warning says slow moving, heavy showers and thunderstorms.
So far there are no weather warnings for the rest of the week.
The Met Office long-range report, however, predicts "changeable" weather through much of June.
"Many areas are likely to see a mixture of bright or sunny spells and showers, some of which may turn heavy in places," it reads.
It also forecasts temperatures around average or above for the time of year for the foreseeable future.
