More thunderstorms are on the way after the UK was battered with almost a month's worth of rain in a day.
The Met Office has issued yellow warnings for thunderstorms and rain in England and Scotland for the next four days possibly causing more flooding and transport disruption.
Merseyside has been highlighted as an area of concern.
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A yellow weather warning is in place for the region from 9am tomorrow (July 27) to 6am on Wednesday (July 28).
The new warnings come as homes and roads were flood in the south of England, and a hospital was forced to cancel all surgery and outpatient appointments on Monday due to the heavy rain.
The Met Office said thunderstorms occur when there is warm air on the surface that is underneath cooler air above it.
The warm air rises and creates instability which can create quite heavy downpours of rain and hail, as well as creating the conditions for thunder and lightning.
A Met Office spokesman said: "Going forward, there's some more thunderstorms and intense downpours in the forecast, with a yellow weather warning for thunderstorms currently active until 5pm today in the far South East.
"The current dominant weather pattern of the UK is set to be a spell of low pressure, bringing with it some more persistent rain from Tuesday and into Wednesday, with some slow moving heavy rain expected over Scotland on Wednesday in particular."
The spokesman said an official study would have to be completed before any connections to the weekend's weather can be linked to climate change, but added the science indicates warmer air can hold more water, so rainfall is increasing on average across the world.
"In some places, rainfall is becoming more intense as well. Heavy rainfall is also more likely.
"Since 1998, the UK has seen seven of the 10 wettest years on record. The winter storms in 2015 were at least 40% more likely because of climate change," he said.
Greenpeace UK's policy director, Doug Parr, said: "Despite decades of warnings, it seems as if there is a reluctance from governments to act decisively on climate change until the flood waters are lapping at your toes.
"Extreme weather of the kind being experienced across the world this summer will only increase in the UK, in both frequency and intensity, unless action is taken to curb emissions.
"With the UK hosting this autumn's crucial climate talks, Boris Johnson must grab the bull by the horns and set an example for others to follow.
"He must bring in ambitious policies that match his rhetoric and actually deliver the emissions cuts that we so desperately need to stop global temperatures from spiralling out of control."
The Environment Agency has one flood warning in place for Whitwell, Wroxall, Langbridge, Alverstone on the Eastern Yar in the south, as well as 10 flood alerts around England.
