Met Eireann is warning of localised flooding, hail damage, and possible power outages.
The Midlands counties have been added to the list of those under a yellow warning for severe thunderstorms today.
The alert comes into effect from 9am for Laois, Offaly, Westmeath, Kildare, Longford, Meath, Tipperary, Cavan, and Clare.
That continues until 6 this evening, with a risk of localised flooding, hail damage and difficult travelling conditions along with potential outages to power and water supplies.
The warning from Donegal and all of Connacht remains in place until 9 am.
Meanwhile the yellow high temperature warning for the entire country has been extended to tomorrow morning.
Offaly's Cathal Nolan from Ireland's Weather Channel says it will be next week before temperatures to return to more normal levels:
Alan O'Reilly from Carlow Weather says there were very intense thunderstorms in the northwest last night:
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