A thunderstorm warning has been issued for Longford,Westmeath and 13 other counties.
The status yellow alert, for all of Leinster, Cavan, Monaghan and Donegal, is now in place.
Met Eireann says these counties could be affected by scattered thunderstorms and lightning, with a risk of localised flooding.
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The warning will remain in place until 8 o'clock tomorrow morning.