Adding to this, Met Eireann has also issued a status yellow wind warning - as an Atlantic depression is expected to track eastwards over parts of the country on Saturday.
The Met Office cautions there will be strong southwesterly winds on Saturday, issuing a yellow warning valid from 4am to midnight.
Met Office forecaster Helen Roberts warned that heavy rain would be falling on already saturated ground and could cause flooding and affect properties.
Forecasters have confirmed that a number of counties around the country are set to experience heavy, thundery rain both today and tomorrow.
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.
Storm Brian is expected to bash the United Kingdom and the Republic of Ireland on Saturday.
The storm - which could bring gusts of wind of up to 70mph (112kmph) - is likely to hit parts of south-west Ireland in the early hours of Saturday morning.
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Under storm naming guidelines, the Met Office and its partner agency Met Éireann name any storm with an amber - or orange - wind warning.
"At the moment, we don't expect the same level of impacts for the United Kingdom", he said.
Speaking with the Irish Independent, Met Eireann's John Eagleton said that Storm Brian will not possess almost as much destructive capability as Ophelia but that it will "hit the United Kingdom".
The Met Office warns of "dangerous" conditions: "Gusts exceeding 50 miles per hour are expected widely within the warning area, with gusts of around 70 miles per hour along exposed coastal areas".
The weather warning system comes days after Ireland was battered by Hurricane Ophelia which caused widespread disruption to Ireland, northern England and Scotland, leaving three people dead.
The strong winds will also coincide with high tides "bringing the potential for risky waves", according to Met Office meteorologist Aiden McGivern.
"At the moment, Storm Brian is nothing to worry about here in Ireland".