Motorists are advised to take due caution and to slow down on roads across the region this morning.
A yellow weather warning for snow and ice is in operation until midnight tonight nationally, but areas of the west and northwest appear to be the worst affected so far.
The Road Safety Officer with Mayo County Council Noel Gibbons is asking drivers to be particularly careful driving in and on hailstones. He told Midwest News that a number of minor traffic incidents have occurred across the county in these conditions this morning.
Power outages are also being experienced across the region, with about 200 ESB customers in the Achill area without a supply since about 8.15 this morning due to a fault on the line. The estimated restoration time is about 12 noon.
Areas of Clifden and Carraroe in Galway are also without a supply this morning , and a major power outage occurred for a short time in the Bellacorrick area of north Mayo just after 8am this morning with 5,000 households affected - but it was restored again about a half an hour later.