Fierce gales were already causing disruption, with airports across the United Kingdom reporting delays to some arrivals and departures.
One man died after a tree fell on his vehicle in Devon on Friday morning. Part of a doubledecker bus in Poole, Dorset, was crushed by a felled trunk and a road in south Belfast was closed when a number of branches fell on the bonnet of a auto.
High winds on Saturday morning caused trees to fall and caused disruption on several roads, and emergency services warned motorists to take care when driving through the hard conditions. "Even away from the strongest gusts we could still have gale-force winds".
The Met Office said Erik would bring strong winds to parts of the country on Friday and will be followed by rain and more unsettled weather.
Storm Erik is battering the North West today bringing strong winds and heavy rain to the region.
BBC News NI weather presenter Cecilia Daly said that Erik was the sixth named storm of the season.
London North Eastern Railway restricted speeds on trains between Leeds and York to 80mph because of the wind, meaning journeys could be delayed by up to 20 minutes, and a service was cancelled in its entirety due to the speed restrictions across the route and a number of late running services.
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Winds caused a CCTV mast to sway above the A20 near Dover, forcing the closure of the road while it was repaired, Highways England said.
"The highest winds will be in exposed coastal areas, where these values may be exceeded at times".
A slight frost is also possible in some parts with temperatures expected to drop as low as 0°C.
Although the wet and windy weather was expected to ease, further hard conditions were forecast.
The south is set to be temporarily hit by a band of wet weather, while snow is expected to fall in higher part of Wales and England's Peak District.
However, it is thought the storm will largely clear on Sunday with conditions becoming more settled as the week progresses - but there could still be outbreaks of rain.
Mr Keates added the band of weather will potentially have "some hill snow" as it makes it way out of Northern Ireland and into Wales and the south-east of England to end Sunday.