MET Eireann issued a Orange Status Warning this morning in 16 counties.
The warning is on the spot for Leinster, Cavan, Monaghan and Waterford because the eastern part of the country is preparing for heavy spills.
Emission Alert, Met Eireann said, "Status Orange – Warning of thunderstorms for Leinster, Cavan, Monaghan and Waterford.
"The moon will affect the eastern half of the country this morning with heavy plumes, a risk of rains and winds.
"Temporary surface flooding is possible for a while, combined with the risk of a sting that will lead to dangerous driving conditions in some areas."
Warning is in place for 5 hours on Saturday until 12 pm.
The prognosticist said that the rains should be disbanded in the afternoon, while sunny weather would pass.
She added: "Mostly dry somewhere with a foggy sun. Further scattered spruces will develop during the afternoon, mostly engaging parts of the southwest and west.
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"Another warm day with the highest temperatures of 18 to 23 degrees, in moderate southern breezes."
Tonight it should be windy with clear scars and some showers, mostly in the west and northwest. Lowest temperatures from 12 to 14 degrees.
It is expected that tomorrow will be bright and windy with sunshine beams and scattered plumes and temperatures of between 16 and 20 degrees.