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The 24-hour alert will come into effect at 4am tomorrow.
The midlands will be under a weather warning for rainfall tomorrow.
Met Éireann have issued the alert for 18 counties, including Laois, Offaly and Westmeath.
The 24-hour alert will come into effect at 4am tomorrow, with the forecaster warning of localised flooding, dfficult travelling conditions and poor visibility.
Met Éireann's Mark Bowe outlines the situation ahead: