Met Eireann say the storms could be slow to move on this evening.
Offaly and Westmeath have fallen under a yellow thunderstorm warning until 9pm this evening.
A status orange warning is in effect in Donegal, Mayo, Sligo and Leitrim.
A yellow alert is in place for the rest of Connacht, Longford, and Cavan until the same time.
Forecaster Matthew Martin from Met Eireann outlines what to expect: