A status orange snow warning is in effect for Donegal, Leitrim, Sligo, Mayo and Roscommon until 3pm.
Storm Eunice is expected to bring blizzard-like conditions.
Power outages are already in the South and West.
Meteorologist with Ireland’s Weather Channel Cathal Nolan says the weather will be very severe this morning:
Local Authorities across the region have roads and fire crews are on standby this morning to respond to emergency situations that may occur from storm Eunice
All main roads will be treated, and motorists are asked to be especially vigilant on untreated secondary roads.
With a yellow wind warning also forecast and a risk of coastal flooding, motorists and other road users are asked to avoid exposed and coastal areas.
With potentially damaging gusts, there is a danger of fallen trees and branches on all routes, and pedestrians in urban areas asked to beware of icy footpaths and falling slates.
Gary Martin, Director of Emergency Services for Donegal Council, says extensive precautions are in place: