The most dangerous conditions are expected in south Wales, where an amber weather warning is in effect, though milder warnings are also in place for Northern Ireland, western Scotland and Cornwall.
As well as brutal winds, lashing rain could cause flooding, power cuts and transportation chaos in parts of the country.
Met Office Meteorologist Aidan McGivern said: “On Friday Storm Callum hits bringing across northern and western Britain strong winds for many areas and a prolonged spell of wet weather throughout Friday and Saturday.
“South Wales in particular is a cause for concern.”
The day will start with the storm off the Irish coast moving towards Scotland.
Mr McGivern claims the morning will see “heavy rain” accompanying “wind gusts reaching 40-50 miles an hour across western parts of Scotland”.
He said: “Across Wales, western England and Northern Ireland in particular 60 miles per hour gusts are possible.
“Later in the day as the storm approaches north-west Scotland there’s the risk of 70 miles per hour guests for exposed parts of north west Scotland.”
Fierce winds aren’t the only threat with concerns also raised about heavy rain and, for coastal areas, powerful waves.
Mr McGivern noted: “Accompanying high tides big waves are the big risk.
“We could see coastal impacts from those.
“The rain is also of concern, a lot of it will pass through 36 hours of Friday and Saturday especially western parts of England, south west Scotland and wales.”
In parts of South Wales in particular there could be 120-160 millimetres of rain.
According to Mr McGiven this is “enough rainfall to cause flooding, communities to be cut off, power cuts, transport delays and cancelations”.
An amber warning is in place for South Wales, meaning there is an “increased likelihood of severely or extremely bad weather” which has the potential to cause “risk to life and property”.
The wet weather will continue for much of the country on Friday, though East Anglia and the south east should largely remain dry.
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