The extreme weather could result in dangerous conditions affecting business all over the country - so here's all the factors that need to be taken into account.
If this happens after school has already started students who go home for lunch should be told not to return while kids who don't have that option should be supervised and sent home when it's safe to do so. Around dawn, a band of wintry showers will push south over Ulster with widespread frost and ice overnight.
Similar showers will take place in Atlantic coastal counties of Connacht and Ulster and also for a time in parts of east Leinster.Thursday, 8 December An icy start on Thursday with patches of freezing fog in places. A band of wintry showers over Ulster will track southwards over the country. Some accumulations of snow are possible, especially in Midland counties and over high ground leading to hazardous travel conditions. Sunny spells and scattered wintry showers will follow.