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.
READ MORE: Met Eireann forecasts 26C scorcher before nasty turn for entire country
The forecaster told RTE's Claire Byrne: "The heat has been moving up through Spain and Portugal to France and it will head further north over the next few days, probably impacting the southeast of England significantly over the weekend.
"We are faced with uncertainty over the next few days. We are on the border between very cold air coming down from the northwest from the Arctic and this heat coming up from the south.
"The two of those are extremes, so extreme heat and quite cold weather. Ireland is in prime position in the north of the Atlantic and is right on the border for those two. With those extremes comes extreme uncertainty.
"We don’t know how far south the cold air will get, we don’t know how long the warm air is going to last or proceed up northwards the country.
"At the moment it looks like Friday will be right on that border. We’ll have heat in the southeast of the country and temperatures possibly getting up to 26 degrees.
"That cold air is coming down and with cold air means warm air rises and it turns into cloud and we get rain."
Are you feeling lucky? Get your daily horoscope reading here
