The storm is wreaking havoc on travel arrangements, with certain flights being canceled on Friday morning at Cardiff and Exeter airports.
Passengers are advised to check service updates with ferry companies before travelling from either Holyhead or Fishguard.
Paul Hand of ESB Networks said 30,000 homes and business were without power, but he anticipated this figure increasing as the storm moves north.
"Accompanying high tides will be big waves and we could see coastal impacts from those and inland impacts from those strong winds as well". Hundreds of homes and businesses are also without power, and 20,000 properties were without power in Ireland.
Joanna Donnelly of Met Éireann said the strong winds will continue on west coast but will ease slowly inland.
The forecast deluge poses a risk of communities being cut off by flooding, while widespread gales are expected to cause disruption across western areas of the UK.
The Environment Agency has issued flood warnings for parts of the Dorset coast, as well as 58 flood alerts across England, while Natural Resources Wales has 28 flood warnings and 39 flood alerts in place.
Numerous warnings are for South Wales, with people being urged to stay alert as downpours could mean river levels continuing to rise.
"We are also starting to see the rain push in to parts of south-west England and part of the Republic of Ireland", Met Office meteorologist Alex Burkhill said. "That's quite a substantial amount of rain to come and could bring flooding".
A Met Office yellow "be aware" warning for wind has been in place since 3am for the west of the country, with gusts of about 80mph expected.
The storm is set to give "further severe and locally damaging wind gusts" to the northwest of the country Friday, with gradually moderate winds elsewhere.
There has also been reports of tress down and flooding in parts with warnings of hazardous conditions through the day.