Winds of up to 80mph are expected to hit parts of the UK as Storm Brendan sweeps in.
All schools and nurseries have been shut as a precaution in the Western Isles of Scotland, where the council has warned bus services are also likely to be cancelled.
The Met Office has issued yellow weather warnings of high winds across much of the UK for the next two days.
While the Republic of Ireland is expected to bear the brunt of the storm, with Met Eireann putting out an orange wind warning for the entire country.
Weather warnings for 80mph winds
Whole of country to see rain at some point
'Severe and damaging' winds to move across Ireland
Footage from Galway as Storm Brendan arrives in Ireland
Ferries and flights cancelled
Schools and nurseries closed
The strongest winds are expected around exposed coasts and hills with gusts of 60-70mph likely, and gusts of up to 80mph possible in some places, particularly around the west coast of Scotland.
Western Isles Council has closed all schools and nurseries to pupils as a precaution for the day, though schools are open for staff who are expected to attend "when they deem it safe to do so".
The council said that all bus services in the area are also likely to be cancelled on Monday.
Flood warnings
Coastguard issues waves warning
Storm Brendan his parts of Ireland and Scotland
Video footage shared on social media shows the storm has already hit at Sailcoats, in Scotland, and many parts of Ireland including Cork, Kerry and Donegal.
Trampoline causes chaos on motorway
'Several hours of very dangerous weather'
Head of forecasting at Met Eireann has warned of "several hours of very dangerous weather" in Ireland.
Evelyn Cusack said: "Thankfully the storm centre is keeping out to the northwest of Ireland but we are going to get several hours of dangerous weather as that transfers across the country."
Met Eireann has issued out an orange wind warning for the entire country.
Ms Cusack told RTE radio pressure is falling rapidly in the west of the country where winds are picking up and there is a risk of localised flooding, local structural damage and uprooted trees.
Visitor attractions and bridges closed in Scotland
Restrictions are in place on several bridges in Scotland, with the Cromarty, Dornoch, Skye and Kessock bridges among those closed to high-sided vehicles.
Some visitor attractions have also been affected, with Dumbarton Castle and Dundonald Castle shut due to the weather.
Edinburgh Zoo has said its last admission will be at 1pm due to the storm.
Thousands of homes and businesses without power across Ireland
Sea wall collapses
A sea wall has reportedly collapsed in Carrickfergus, County Antrim, Ireland, causing police to close the road.
Video footage shows traffic struggling to drive through inches of water as waves crash over a wall.
Kevin Scott, who shared the clip on Twitter, wrote: "Absolutely horrendous conditions on the Belfast Road in Carrickfergus. Police have now closed the road as the sea wall collapses."
