The zone of heavy rain affecting England and Wales on Friday is expected to slowly move northwards on Saturday, with the focus of heaviest rainfall slowly moving away from south Wales but increasingly into parts of Scotland.
On Saturday, heavy rain is expected across most of the country as it looks set to be a wet weekend.
Heavy and persistent rain is due to fall from 6am until midnight on Friday in the north west of England, south west of Scotland and Lothian Borders, Wales and Yorkshire and Humber.
A storm that's been dubbed "Callum" will pass to northwest of the United Kingdom on Friday, bringing winds of up to 70mph and a prolonged downpour that will create hazardous conditions across the country.
Head of Forecasting at Met Eireann (the Irish Met Office) Evelyn Cusack said a combination of storm-force winds and high tides means there is a possibility of flooding along the east, south and west coast as far north as Donegal.
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"There will be rain later tonight and, combined with winds and high tides, there is a risk of coastal flooding". Fallen leaves will lead to blocked drains and flooding issues.
"For Tayside and Fife on Friday there are no warnings in force but the rain is going to continue across the area right into Saturday".
A road that was closed after an accident at Slieve Gullion forest park near Newry, Co Down, where a contractor working for Northern Ireland Water died after he was hit by a falling tree as Storm Ali wreaked havoc across Ireland. More localised surface water and river flooding is also possible for high ground parts of the south-west of England on Friday and Saturday.
Winds of up to 60 miles per hour are also expected to hit Pembrokeshire, which combined with high tides could lead to some coastal impact due to large waves.
"We are going to get very high winds followed by a lot of rain and there could be some coastal surge".