The US National Hurricane Centre (NHC) has in the past few hours released an advisory to UK citizens to be on heightened alert.
Terrifying and almost never before seen forecasting models show the violent superstorm smashing into Britain on Monday.
The nation is warned to brace for toppling trees, travel chaos and the risk of injury from flying debris.
A rare and noxious combination of meteorological factors will ensure the churning cyclone – feared to be the worst for a decade – will not weaken before it hits the UK.
Instead Ophelia is poised to scour huge swathes of the country while remaining as close as is possible to a fully-formed hurricane.
The NHC warned the100mph tempest will hit Ireland just after the weekend before reaching Britain at around 8pm on Monday.
UK forecasters are watching her progress with trepidation while the government has issued a severe weather warring for wind through Monday.
Britons are warned to prepare for power outages, road chaos and delays on railways, ferries and at airports.
The storm even threatens to throw the UK communication networks into chaos knocking out mobile phone signals.
Unlike previous hurricanes which weaken or dissipate before they reach the UK, Ophelia will arrive fully-formed, The Met Office said.
Her unusual path across the Atlantic will see her swerve other weather systems which usually knock some of the stuffing out of hurricanes before they reach the North Atlantic.
Met Office spokesman Grahame Madge said: “Ophelia has had a much shorter track across the Atlantic compared to other systems which have come into the north Atlantic.
“She hasn’t encountered other weather systems and not been influenced by them, so rather than dissipating into the usual remnants of warm air, Ophelia will arrive with her original integrity.”
A severe weather warning has been issued down the west coast of Britain which is currently in the firing line to bear the brunt of the onslaught.
While the main threat will be from powerful gales, forecasters have warned Ophelia could unleash heavy downpours in parts.
The NHC this morning warned the storm has continued to strengthen over the past few hours and will reach Britain and Ireland as a “Hurricane-force” cyclone.
A spokesman said: “While post-tropical Ophelia will likely bring some direct impacts from wind and heavy rain to portions of these areas, as well as dangerous marine conditions, given the forecast uncertainty at these time ranges it is too soon to determine the exact magnitude, timing and location of the impacts.
“Residents in Ireland and the United Kingdom should monitor the progress of Ophelia for the next several days.
“Ophelia is expected to transition to a hurricane-force post- tropical cyclone by Monday when it moves near Ireland and the United Kingdom.”
Ophelia is expected mimic Tropical Storm Grace which hit Britain in 2009 and ex-hurricane Gordon which struck in 2006.
Both wrought havoc across the country and are considered to be up there with some of the worst storms to this the UK.
The Met Office said regions most at risk will be the Highlands and North West England; Northern Ireland; Southwest Scotland; the Lothian Borders; Southwest England; Strathclyde and Wales.
Met Office chief forecaster Steve Wellington said: “A spell of very windy weather is likely on Monday in association with ex-Ophelia.
“Some delays to road, rail, air and ferry transport are possible.
“There is a slight chance that power cuts may occur, with the potential to affect other services, such as mobile phone coverage.
“There is a slight chance of some damage to buildings, such as tiles from roofs.
“It is possible that some coastal routes, sea fronts and coastal communities will be affected by spray and/or large waves.
“There is also a small chance that injuries could occur from beach material being thrown onto sea fronts.”