Strong winds associated with Storm Callum, coinciding with high spring tides, will hit Ireland on Thursday night and Friday morning, with coastal areas the worst affected.
The other 13 counties have been issued with a yellow warning which will also end at 9am on Friday.
Here an Amber Warning is in place all day.
There are two rain warnings from the Met office, one for Friday for Wales, also Cumbria into southern Scotland.
The Met Office is warning that there exists the potential for injuries and danger to life, the possibility of damage to buildings and disruption to travel.
According to the Met Office, gusts of 50 miles per hour are likely with potential for gusts of 60 miles per hour around exposed coasts and hills.
Not yet formed, but later Thursday into early Friday, a rapidly deepening Atlantic storm depression (936hPa), will advance towards the west of Ireland and track northwards, eventually pulling away towards Iceland daytime Friday.
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In Galway, council crews are rolling out the city's aquadam ahead of potential high-tides of up to six metres. Vehicles were stranded roads were submerged in Oban, while several landslips blocked the A83 in Argyll.
However, it is Friday (October 12) which will see the full force of Storm Callum.
"On Friday, the winds will ease somewhat in many areas during the morning, becoming fresh or strong southerly".
Natural Resources Wales' (NRW) have said they are sending out their emergency response teams to prepare for the storm, checking that flood defences are in good working order, clearing gulleys and ditches, and installing temporary defences.
There will be rough seas and large waves, making coastal areas unsafe.
The weather system will initially have the greatest impact on the west of the country and then move north, however all of the country will be hit.
While heavy rain is expected to continue into Saturday, the wind is now forecast to ease off by Friday evening.