Met Éireann are keeping the Orange Status Wind Warning in place for Donegal, Galway, Mayo, Sligo and Clare until 5pm on Friday evening, while the rest of the country will be taken off the orange status as of 9am on Friday morning.
In Dublin, the national emergency co-ordination group met on Thursday for a briefing on the incoming storm.
The Met Office has warned that homes and offices are likely to be flooded, and fast flowing or deep floodwater could cause a danger to life.
Prolonged heavy rain is expected across much of the country on Friday and again on Saturday.
A yellow rain warning is in place from 6am to midnight on Friday for heavy, slow moving, rain that will affect the North West, including Blackpool, Cumbria and Lancashire.
"Those rainfall totals are really going to be mounting up, 40-60 mm, we could see up to 100 mm in the higher ground in the south of Wales in particular". The Warningsford Road, Banbridge is partially closed due to fallen trees, while there are also reports of a fallen tree on the Hillsborough Road, Monyreagh.
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The council has distributed sandbags to protect homes at risk of flooding.
David Costello captured this footage of Storm Callum not adhering to the speed limit while waves battered Strand Road, Sandymount, last night. "In addition, leaves and twigs, brought down by the wind, could block drains and culverts, increasing the likelihood of flooding".
"Control of a vehicle may be affected by strong cross winds".
Sioned Warrell, Natural Resources Wales Duty Tactical Manager, said: "The rain could cause flooding, especially in south and west Wales, and we are urging people to prepare themselves".
While heavy rain is expected to continue into Saturday, the wind is now forecast to ease off by Friday evening.
"Making sure you know what the situation is like where you live is really important".