Met Éireann has issued Status Orange wind warnings for the entire country today.
In an updated warning ahead of Storm Brendan, Met Éireann said the wind warnings come into effect at 5am for Connacht, Kerry and Donegal and 8am for the rest of the country.
It said southerly winds will reach mean speeds of 65 to 80km/h with gusts up to 130km/h, higher in exposed areas.
Please see our updated warnings regarding #StormBrendan on https://t.co/ozrQHtoOkt, coming into effect at 5 am for Connacht, Kerry and Donegal and 8 am for the rest of the country. pic.twitter.com/JshS47suAr— Met Éireann (@MetEireann) January 12, 2020
The alert for the rest of the country comes into effect from 8am and remains valid until 3 o'clock this afternoon.
Met Éireann said southerly winds will reach mean speeds of 50 to 70km/h with gusts of 100 to 120km/h during those times.
It said there is also a significant risk of coastal flooding due to a combination of strong winds, high spring tides and storm surge.
Added to the wind warnings, Met Éireann has issued a Status Red Marine gale warning.
It said gale force to storm force 10 southerly winds will develop overnight and on Monday morning on all Irish coastal waters and on the Irish Sea. Winds will reach violent storm force 11 at times from Mizen Head, to Slyne Head, to Malin Head.
Cork City Council is warning that traffic restrictions will be in place along some of the city's quays early today and on Tuesday morning ahead of expected flooding.
In Mayo, the county council said the Belmullet-Blacksod regional road R313 will be closed from 5am to 10am this morning due to anticipated tidal flooding. Local diversions will be in place.
Donegal County Council said that the Pier car park in Donegal town has been closed since 6 o'clock on Sunday evening and will remain shut until 8am on Tuesday morning.
The council said it had activated its Severe Weather Assessment Team and that it was keeping the 'evolving situation' under review.
Meanwhile, Dublin City Council said it will be erecting flood defences and closing the car parks at Clontarf and Sandymount from 6am on Monday. It is expected that these car parks will reopen this afternoon.
The council said it may also be necessary to close some floodgates along the River Dodder in the Ballsbridge area.
Elsewhere, Kerry County Council's Severe Weather Assessment Team has asked members of the public to avoid exposed coastal areas during the weather warning and for motorists to be aware of the possibility of debris, fallen trees and branches, and fallen power lines on roads.
The National Directorate for Fire and Emergency Management (NDFEM) said: "This is a high energy storm system, that will give rise to very stormy conditions from early Monday morning in all coastal areas."
The directorate said local authorities had activated coordination and crisis management arrangements to prepare for the arrival of the storm.
Meanwhile, the Office of Public Works issued a high tide advisory and local authorities are advising coastal communities that there is a significant risk of coastal flooding.
In Northern Ireland, the Met Office issued a yellow warning that will be in place from 10am to midnight.
The Dublin Port Company said there would be temporary closures to public access on the Great South Wall and North Bull Wall Bridge today.
The Great South Wall will be closed from 11am to 4pm and the North Bull Wall Bridge from midday to 2.30pm.
The closures are due to high tides and dangerous winds on the exposed wall surface.
The Port Company also said it expects delays to some shipping activity, including at the port's LOLO container terminals.