Thunderstorms could bring a month's worth of rain to parts of the UK, before the hottest temperatures of the year so far.
The South East, East Anglia, the East Midlands and the North East are expected to be hit by storms.
Thunderstorms are forecast to cause disruption and flooding on Tuesday and Wednesday.
Around 400 passengers were stranded for up to eight hours after the trains came to a standstill.
Two sinkholes have closed the M25 in Kent and rail services were heavily disrupted on Tuesday morning.
Showers may be thundery with hail or give sleet or snow over high ground.
There'll be top temperatures of 14 Celsius (57 F), though it will be feeling chilly in the wind and rain.
It will be a cold start across the UK, with an added chill from the wind.
The extreme weather brought torrential rain and downpours to many parts of the UK.
When the rain clears, strong winds can be expected