Storm Jorge is battering the country with winds of up to 120km/h in Cork, leading to flight cancellations.
The worst of the weather is on the west coast of the country, where an Orange weather warning remains in place.
The weather warning for Cork has been downgraded to Yellow, but strong gusts are still expected, especially near coastal areas.
Light snowfalls have also occurred in parts of the county.
Video footage from Galway showed a truck being blown over.
The footage was captured today on the N59 at Maam Cross in Connemara.
Galway, Mayo, Donegal and Clare are among the worst areas affected, with dramatic videos of huge ocean swells.
Here in Cork, winds have already begun to pick up, with strong gusts.
Flights from London Heathrow have been cancelled this afternoon.
Several planes had to circle several times before landing safely already today.
There have also been reports of several trees down across Cork county and conditions could deteriorate further in the coming hours.
Storm Jorge is to bring damaging winds of up to 120km/h to Cork today.
A Status Orange warning has been issued by Met Eireann for the city and county.
The Orange warning for wind will be in place from 1pm to 7pm today.
Westerly winds will reach mean speeds of 65 to 80km/h for a time this afternoon and early evening with gusts of 110 to 120km/h, possibly higher in exposed areas.
A number of sports events are expected to be cancelled or postponed.
The Cork Head of the River regatta scheduled for today at The Marina in Cork has been postponed.
The organisers took the decision on safety grounds, with 315 crews due to take part.
It has been rescheduled to Saturday next, March 7.
The Harty Cup Final between Christians and St Flannan's has been postponed from today until tomorrow.
The storm, named by the national meteorological service of Spain, was tracking north-eastwards, approaching the country this morning.
A meeting of the National Emergency Coordination Group took place yesterday to prepare for the conditions.
Chair of the State's National Emergency Coordination Group, Keith Leonard, warned that conditions will be “hazardous” from early today until late this evening.
He said that the Defence Forces have been deployed to a number of locations and have been working with affected communities for the last number of weeks, however, he said it may not be possible to continue with such operations during the height of the storm.
"During the height of that storm, it may not be possible to continue all those operations. It may be a case of suspending them for a period and resuming them then at first light on Sunday morning when conditions improve,” he said.
Met Eireann has issued a Status Red Wind warning for Galway and Clare`which predicts gusts of between 130km/hr and 145km/hr in the two counties between 1pm and 4pm on Saturday afternoon.
Road users in areas affected are advised to check local traffic and weather conditions before setting out on a journey.
The following advice is being given to motorists:
- Control of a vehicle may be affected by strong cross winds.
- High sided vehicles and motorcyclists are particularly vulnerable to strong winds.
- Beware of objects being blown onto the road.
- Expect road conditions to change quickly in high winds so reduce your speed
- Watch out for falling/fallen debris on the road and vehicles veering across the road
- Drivers should allow extra space between themselves and vulnerable road users, such as cyclists and motorcyclists as they may be blown off course by strong winds
- Drivers need to slow down in wet weather conditions, especially on high-speed roads such as dual carriageways and motorways where there is increased danger of aquaplaning
- If the road ahead is flooded choose another route, do not attempt to drive through it
- Road users should always follow recommended routes and obey signs closing roads to traffic
- After going through water, drive slowly with your foot on the brake pedal for a short distance - this helps to dry the brakes
- Drive with dipped headlights at all times