Met Éireann has raised the alert level for Storm Brendan to a Status Orange for all of Ireland as expected weather may pose a threat to life.
The forecaster is predicting gusts of up to 130 kilometres per hour. However, at 3pm on Sunday the forecaster extended the warning to the entire 26 counties.
"This is a high energy storm system, that will give rise to very stormy conditions from early Monday morning in all coastal areas", it said.
Two Status Orange weather warnings have been issued by Met Eireann covering much of the south and west of Ireland, while the remainder of the country is under a status yellow warning.
"We can expect a risk of coastal flooding, high spring tides, storm surge and of course some heavy rain", she said.
Storm Brendan is expected to last from 10am tomorrow to 11.59pm.
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The directorate said local authorities had activated coordination and crisis management arrangements to prepare for the arrival of Brendan.
It is also warning there is a significant risk of coastal flooding.
"As Storm Brendan moves eastwards, strong winds will also develop across eastern parts of the United Kingdom, particularly northeast Scotland where there is also a wind warning in place".
Mr Saunders added the severe conditions could cause travel disruption, and those in affected areas are advised to take extra care when driving on exposed routes such as bridges or high open roads.
Weather warnings have been issued by the Met Office for the region, advising people of potential disruption.