Met Éireann has issued a thunderstorm warning for six counties in the midlands and north-east.
Cavan, Monaghan, Longford, Louth, Meath, Offaly and Westmeath are under the alert until 6 o'clock this evening.
Meanwhile, a separate warning for the entire country for high temperatures remains in place until Saturday.
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Emer Flood from Met Éireann outlines where the hottest temperatures are expected.