The Status Yellow snow-ice Warning applies to all of Ireland.
The Met Office has issued its latest warning for snow and ice across Co Tyrone.
A Met Office spokesman said that commuters could be adversely affected by the bad weather, with icy roads expected to bring traffic to a standstill in some areas.
As if we hadn't had enough snow and ice, now there's wind and rain on the way..
'People need to be careful on the roads and make allowances for long journeys'.
Temperatures will also plunge down to -2 tonight.
Today will be a great deal milder than tomorrow, with highest temperatures of 8 to 12 degrees.
Temperatures in the city and county are expected to fall to zero tonight, paving the way for an icy start to Friday, with snow likely as it struggles to reach three degrees.
The State forecaster said Monday will be slightly warmer, with daytime temperatures of between 4-7 degrees.
"So once we clear this weather front into the north sea, Sunday sees a brisk northwesterly breeze, follow these isobars back and you get to Arctic Canada and the air will be particularly cold during Sunday". Weather forecast very windy which could turn to snowy showers at any point.
Sunday: Bright spells and snow showers, most frequent in northwest.
"At this stage, I wouldn't rule out a few centimetres of snow falling to low levels in central and southern areas later".
It will continue to get warmer heading today, which will see gales of up to 40 miles per hour across northern regions.