A number of flights between Dublin and London Heathrow this evening have been cancelled as a consequence of bad weather forecast to hit Ireland and much of the UK.
Wintry weather is set to sweep across the country over the next two days, with counties Donegal, Cavan, Monaghan, Sligo, Mayo and Leitrim bearing the brunt.
Met Éireann has issued snow and ice warnings covering most of the country.
The heaviest snow is likely to be over Ulster, Connacht, north Leinster and west Munster - especially on high ground.
Local authorities are activating severe weather plans and Defence Forces personnel have been put on standby.
Aer Lingus and British Airways flights between Dublin and Heathrow are included in 80 departures and arrivals to Heathrow that have been cancelled for this evening.
Intending passengers are advised to check with their airlines.
Bus Eireann say they are minor delays reported on their northbound services in both directions due to heavy snowfalls between Monaghan & Omagh.
Authorities in the northwest say there was no major disruption overnight. There were some snowfalls in Donegal and parts of Sligo, but it was melting away.
Gritters were on the roads in Donegal, Sligo and Leitrim from the early hours of this morning.
Donegal, Sligo and Leitrim County Councils continue to be on the alert during the period of the weather warning, with gritters and snowploughs at the ready.
Heavy sleet is falling in the north east and parts of the midlands this evening.
Some of the worst affected areas are Carrickmacross, Co Monaghan and Bailieborough, Co Cavan where freezing temperatures are making road conditions hazardous.
Heavy snow blanketed Northern Ireland mid-morning, with Coleraine and Ballymena among the towns worst hit.
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The Road Safety Authority is advising all road users to take extra care when using the roads over the next 72 hours.
The RSA is asking road users to check local weather and traffic conditions and be aware of the conditions before setting out on a trip.
It advises drivers to clear windows and mirrors before setting out, and to avoid using hot water on windscreens as it can crack glass.
Drivers are urged to slow down, watch for black ice, and leave extra distance between you and the vehicle in front.
Kerry County Council is asking motorists to avoid the Conor Pass in west Kerry following heavy snowfalls and icy conditions.
There has been snow at the county bounds on the N22 and driving conditions there are poor.
In all parts of the county, motorists are asked to drive with care and allow plenty of time for journeys this evening and throughout Friday.
Kerry County Council crews are salting main routes however motorists should always exercise caution and drive with care.
The Council is monitoring the situation closely and will provide updates on social media and through the media generally.