Northwest winds are set to reach mean speeds ranging between 65kph and 80kph - with gusts of 110-130kph likely in coastal parts of Connacht with the risk of coastal flooding.
"Gusts exceeding 50mph are expected widely within the warning area, with gusts of around 70mph along exposed coastal areas".
The Ophelia-battered southern half of the country is now bracing itself for yet more high winds, along with potential torrential rainfall and spot flooding.
They state that "A spell of strong southwesterly winds is expected".
The Met Office and Met Éireann do not rename the remnants of storms that have moved across the Atlantic, if they have already been named.
Another warm winter forecast for swath of US
For the United States, La Nina would reduce precipitation across much of the South, with limited increases in the far north. NOAA says they will update their forecast in the coming weeks as La Nina conditions develop.
At present, Storm Brian is out over the Atlantic Ocean and is, what meteorologists describe as, a weather bomb.
The term weather bomb is used by United States forecasters to describe a rapid fall in the central pressure of a storm system.
On Twitter Met Éireann wrote; "The system that may become #StormBrian will undergo explosive cyclogenesis in the next 24 hours".
Latest models show the tempest hitting the southwest coast at around 9am on Saturday before ripping through the country during the day.
Classified by Met Éireann as a storm earlier on Thursday (19 October), its affects are predicted to be felt all across the United Kingdom with strong winds forecast for Wales, north-west England and most of southern England on the first day of many pupils' half-term holidays. We expect winds of 80mph perhaps stronger in coastal regions and although these might not be as strong as Ophelia it is important to note that many trees may have been weakened earlier in the week.
Met Eireann officially named the second "home-grown" storm of the season following on from Aileen last month.