Rhode's Cathal Nolan from Ireland's Weather Channel says it's been forming slowly over the Atlantic.
A sub tropical airmass is why we're experiencing a period of significant muggy weather, according to an Offaly climate scientist.
Temperatures of up to 28 degrees are being forecast across the region today by Met Eireann, with a possible heatwave on the cards.
This latest warm spell of weather is also being influenced by the more extreme heat across Europe at the moment.
Rhode's Cathal Nolan from Ireland's Weather Channel says it's taken its time to form:
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