This is a developing situation that could prove disruptive.
Currently the models are more than flirting with a much colder regime for Ireland and the real risk of some prolonged snowfall can not be ruled out.
As a northerly or north-northeasterly is the likely outcome it is northern areas that will take the brunt.
However there are two things in particular to watch.
On Wednesday a period of rain and strong winds will sweep up from the southwest. Initially it will be pleasantly mild and wet. However during Wednesday night and for Thursday as really cold air digs in from the north there is a real prospect this could turn to snow temporarily as temperatures plunge rapidly nationwide.
This is not nailed. What's maybe more certain is that after that bitterly cold air becomes entrenched and heavy snow showers follow - with another real prospect of troughs and polar low type features through Thursday night and Friday that would enhance snowfall for a good chunk of the country and lead to disruption.
Friday looks very cold indeed. Temperatures may struggle above freezing and may remain below over snow covered ground.
Specifics can't be nailed yet. Definitely be aware and keep an eye on forecasts.
It could be a 48 to 60 hour "event" but every chance it could go beyond that but lets keep this within the realm of the more realistic time frame. This applies until Friday night, but we will soon be able to elaborate further and in much more detail.
There is good enough cross model agreement.