Speaking on RTÉ's News at One, Joanna Donnelly of Met Éireann said winds would be strongest in coastal areas.
Met Eireann said: "Strong winds associated with Storm Callum, coinciding with high spring tides will affect Ireland on Thursday night and Friday morning".
"Although the winds will be strongest at the coast they will also be strong inland too, with gusts expected of up 100 km and hour".
Met Eireann has upgraded warnings in effect for tomorrow to Status Orange for 13 counties ahead of Storm Callum, which is expected to hit the country tomorrow night (Thursday, October 11).
There are still yellow alerts in place for wind and rain for Northern England and large swathes of England and Scotland.
Heavy and persistent rain is due to fall from 6am until midnight on Friday in the north west of England, south west of Scotland and Lothian Borders, Wales and Yorkshire and Humber.
Heavy rain will hit western parts of the United Kingdom as early as tomorrow, with flood warnings put in place ahead of the oncoming storm.
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Coral reefs will also be drastically effected , with between 70 and 90 per cent expected to die off, including Australia's Great Barrier Reef.
On Saturday, areas over high ground could see a further 50 to 80mm of rain. Gusts 50 to 60 miles per hour are likely in some places, with potential for gusts of 70 to 80 miles per hour around exposed coasts and hills.
Storm Callum will end Britain's mid-week heatwave, which will see millions of Britons bake in another Indian summer. There is the potential for flooding in these areas.
Arriva is also cancelling services between Llandudno Junction and Blaenau Ffestiniog on both Friday and Saturday.
The county council is urging motorists to avoid all coastal roads, and to only make essential journeys.
Wales and the North West could have the heaviest deluge.
The RSA said that with the risk of coastal flooding, motorists should not attempt to drive through flooded areas.
While heavy rain is expected to continue into the Saturday, the wind is now believed to ease off by Friday evening.