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.
Limerick has experienced major flooding this morning as Storm Brian hits the south and west of the country..
Severe weather warnings have been issued with flash floods, strong winds and huge waves expected to lash Wales and the South of England on Saturday.
"The low pressure system will then migrate northwards on Sunday taking the stronger winds with it".
Meanwhile, the HSE in the south-east says preparations are in place to react to the current and impending "Yellow" rainfall and "Orange" wind weather warnings associated with Storm Brian.
The Met Office said: "The worst risk areas are along the south coast and the west coast, but even heading as far north as north-west England, such as the west coast of Cumbria and Lancashire, which are now in the yellow warning area".
National flood duty manager for the Environment Agency Ben Lukey warned members of the public against posing for photos during the hazardous conditions.
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"Environment Agency teams are on the ground checking defences and taking precautionary measures such as closing tidal gates".
"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 auto".
"Short term loss of power and other services is also possible".
"Speed restrictions may be imposed in the worst-affected areas for safety reasons, which may delay your journey".
The Energy Networks Association, representing the UK's energy infrastructure, also reminded residents to call the free 105 advice telephone number in case of damage to local networks and power supplies.
Storms in the United Kingdom and Ireland are named alphabetically and Brian will follow September's Storm Aileen.