Offaly's Cathal Nolan says Leinster will bear the brunt.
Today could be the hottest day of the year so far.
Met Éireann is forecasting temperatures of up to 28 degrees in Leinster and Ulster.
Severe downpours, hail and spot flooding could follow, though.
A yellow thunderstorm warning will be in place throughout Ireland from 4 o'clock this afternoon until 9 o'clock tomorrow morning.
Offaly's Cathal Nolan, from Ireland's Weather Channel, says Leinster will bear the brunt of the storm:
Nine Finalist Spot For The Midlands In Digital Town Awards
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Substantial Amount Of Cash And Drugs Seized In Laois To Be Sent For Examination
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The plan is being put in place as part of an EU directive.
€18k Made Available To Fund Midlands Age And Opportunity Programme
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Over 300 New Dwellings Completed In The Midlands This Year
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National Ploughing Association Appoints New President, Chair And Vice-Chair
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Offaly Boy 'Raring To Go' After Life-Saving Procedure
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Over €7m In Just Transition Funding For The Midlands
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Just over 1,800 homes were built in the region last year.
Abolishment Of Carer's Means Test May Be Halted By "Permanent Government"
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Gardaí Advising Motorists To Avoid Midlands Road
Emergency services are at the scene.
