Storm Francis is set to bring 22 hours worth of rain to Liverpool in just one day as the city prepares for flooding and travel chaos.
Two yellow weather warnings are in place for the region as strong winds and heavy showers are expected until the early hours of Wednesday morning.
The downpours began at around 2am on Tuesday morning and according to the Met Office, the rain will not calm down until 8am the next day.
Issuing the warnings, the weather authority has warned that the extreme conditions could cause power cuts, disruption to travel, huge waves and flying debris.
It comes just days after Storm Ellen claimed lives as it hit the UK and Ireland with winds of almost 90mph that uprooted trees, damaged buildings and caused dangerous sea conditions.
Forecasting the weather for Tuesday and Wednesday, the Met Office said: "Tuesday will be a very wet and windy day, though the rain may clear for a short period around lunchtime, before returning in the early afternoon.
"Feeling fresh strong to gale force winds. Maximum temperature 18 °C.
"Rain and winds easing on Wednesday, leaving some sunshine by the afternoon.
"Thursday and Friday look unsettled again, with further showers, or longer spells of rain.
"Turning windier by Friday."
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In regards to the approaching storm, on their website, Met Office forecasters said: "Wind and rain warnings are in force for Tuesday as another named storm impacts the UK.
"A deep area of low pressure will cross the UK from Monday night, bringing wind gusts of 60mph and potentially 70mph in exposed western locations and also heavy rain for many.
"A yellow wind warning is in force for the whole of Wales and most of England until midday on Wednesday.
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"Whilst not exceptional, winds this strong are unusual for August and they will be accompanied by some heavy rain in places, with possible transport disruption and impacts on outdoor activities.
"The rain is expected to be heaviest in Northern Ireland and south-west Scotland where 60-90mm in total could fall as the storm moves from west to east."