The Met Office has issued warnings across England after it was forecast that a month's worth of rain could fall in the next few hours.
It also warned that flooding as a result of the deluge could result in a 'danger to life' in some parts of the UK.
An amber warning is in effect between 3pm until 11pm across London and the South East where 'intense' rainfall and thunderstorms are predicted.
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As much as 60mm of rain could fall in some places. To put that into context, the average rainfall for June in southern England is 51mm.
Yellow warnings for 'heavy prolonged rainfall' are in place across the entire day for Yorkshire, London and the Midlands.
It is likely that the downpours could cause disruption to bus and train travel, as well as making driving conditions difficult. Power outages are also on the cards in badly affected places.
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Flooding is also possible in many areas. Indeed, the Met Office said that some areas are 'likely to be flooded' and that 'fast-flowing floodwater is possible, causing danger to life'.
Met Office spokesperson Nicola Maxey told The Independent: "We're looking at some very heavy showers, very heavy rain - the sort of rain the drains don't cope with very well so you get surface water flooding very quickly.
"It's that sort of really heavy downpour that has impacts, especially on built-up areas."
Sunday saw heavy rainfall across large parts of the UK, but these latest storms promise to be more intense and potentially more damaging and dangerous.
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Forecaster Steven Keates added: "Probably later this afternoon into this evening and tonight we could see some of the heaviest rain.
"It is going to be more the persistence of the rain in some places and the intensity for others.
"Eastern and southern England in particular are likely to be seeing long and persistent bad weather."
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The Environment Agency has already alerted the public to the risk of flooding near to London's Ravensbourne river. The warning covers the capital boroughs of Greenwich, Croydon, Bromley and Lewisham.
Low terrain, as well as roads and gardens are at the highest risk. The agency said: "We are actively monitoring the situation and are prepared to respond if required.
"Please avoid using low-lying footpaths near local watercourses and plan driving routes to avoid low-lying roads near rivers, which may be flooded."
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There are further yellow warnings in place over the next few days for central and north eastern England. Northern Ireland and Scotland are likely to be less affected by the bad weather.
Featured Image Credit: PA