RTE weather forecaster Joanna Donnelly has warned that Ireland is facing "extreme uncertainty" in the coming days.
Friday looks set to be the hottest day of the year so far with 26C heat - but only half of the country will get to bask in the glorious sunshine.
Because Ireland is ‘on the border’ between a clash of cold air from the north and hot air from the south, the north and northwest will be considerably colder.