The advisory has been in effect since yesterday (Wednesday) and continues until Wednesday of next week (20th).
Ireland is expected to experience a hot spell from Sunday and into next week with temperatures in the high 20s and possibly exceeding 30 degrees in some parts.
Most forecasts show extremely warm weather on the way as warmer air arrives from the south. Roscommon’s weather station, which is located at Mount Dillon, is expected to hit temperatures in the high 20s by next Monday or Tuesday.
Meanwhile, in the UK, the Met Office has issued an amber warning as temperatures look set to increase in large parts of England and Wales. Temperatures there are expected to reach the mid to high 30s in areas while some forecasters believe the UK could be set to hit an all-time record of 40 degrees.