Storm Brian, now over the mid-Atlantic, will "undertake explosive cyclogenesis" over the next 24 hours, according to the Met Office, meaning the low pressure cyclonic weather system will see a rapid collapse in pressure.
Dave Reynolds, a forecaster for The Weather Company, said: "This storm is going to be large enough to affect the whole of the UK".
'Gusts exceeding 50mph are expected widely within the warning area, with gusts of around 70mph along exposed coastal areas.
Warnings are in place that more trees may come down in the winds and people have been urged to take care on the roads.
"The low pressure system will then migrate northwards on Sunday taking the stronger winds with it".More news: BoE Deputy Skeptic About Rate Hike
A Status Yellow wind warning has been issued for Co.
He said: "The east-facing coast could well see the strongest winds".
The Met Office said the southern and western coast of England will remain under a yellow weather warning for wind until midnight on Saturday, when the worst of the storm is expected to have lost potency and moved into the far north-easterly reaches of Scotland.
"EA teams are on the ground checking defences and taking precautionary measures such as closing tidal gates".
According to the Met office, Alison Baptiste, National flood duty manager for the Environment Agency, said: "We urge people to stay safe along the coast and warn against putting yourself in unnecessary danger by taking "storm selfies" or driving through flood water-just 30cm is enough to move your vehicle".More news: Dark skies mean good Orionid meteor shower viewing
'We're working with the Met Office and local authorities and are ready to respond as necessary.
National Rail warned the stormy weather could impact on train services, with emergency speed restrictions imposed on most of the routes in Wales.
A spokesman said: "Fallen trees and other debris may temporarily block railway lines and damage overhead wires".
Wind speeds of up to 80mph in isolated areas has been predicted as the storm sweeps over the south of the United Kingdom and Ireland before moving northwards.More news: Nintendo Switch Update 4.0 Lets You Transfer Save Data