As the bad weather continues to worsen over the next 24 hours, motorists are being advised to exercise caution on the roads.
Roads are particularly bad in around south Armagh, leading into Armagh city itself, with rain washing away much of the grit sprayed overnight.
And with the snowing hitting hard this morning, traffic may be disrupted and public transport affected into the afternoon.
NI Traffic Watch say their traffic cameras showing tricky conditions / falling snow on A1 around Newry and Camlough towards Banbridge and Hillsborough roundabout.
.@aaroadwatch @TrafficwatchNI blizzard conditions in Armagh,rain washed grit away last night,roads extremely icy incl the main roads
— Óonagh McArdle (@Oonagh_McArdle) January 16, 2018
The M1 into Belfast is completely congested from Junction 8, near Sprucefield. This is due to an earlier collision on the Westlink.
At present, the only schools in Co Armagh closed today are Derrynoose Primary, Clea Primary, St Patrick’s High in Keady and St Michael’s Primary in Newtownhamilton.
A PSNI spokesperson said: “If it’s snowing in your area please make sure that you clear snow from your vehicle. Please do not leave it unattended with the engine running – someone may come along and steal it.
“Keep a safe distance from the vehicle in front and leave plenty of time for your journey.”
The Met Office’s yellow warning is in place right up until midday on Thursday.
Today will bring the worst of the weather with snow predicted through the day with the heaviest of that between 5-10pm.
The Department for Infrastructure say its winter safety service is ready to keep people moving on our roads.
Around 300 staff and 130 gritters will be available to salt main roads to keep traffic moving safely and freely.
Twelve specialist snow blowers are also available to be deployed if required.