Dublin City Council said it is querying the “timelines” of weather warnings after the capital experienced “exceptionally heavy rainfall” overnight.
Wicklow and Dublin were hit with intense rainfall during the night and a number of areas woke to major flooding.
Met Éireann said the rain was more intense than forecast earlier on Thursday.
It said an area of low pressure to the west of the country “steered a weather front over Ireland” during Thursday and Friday.
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“This weather front brought spells of heavy rain to parts of the midlands and the east of the country during Thursday evening and overnight.”
Regarding Dublin and Wicklow, it said a status yellow rainfall warning was issued at 2.36am.
“This warning was issued to increase public awareness, taking account of expected intense rainfall during the morning commuting period.”
Two new warnings for heavy rain and snow have been issued for Saturday.
A status yellow rain warning for Cork and Kerry is in place from noon to midnight and includes the possibility of flash flooding. A separate status yellow warning for rain with the possibility of snow is also in place from midday across Connacht, Donegal, Cavan and Longford.
The forecaster warned that the rain will be heavy at times and will turn to sleet or snow, together with strengthening winds.
In a statement on Friday, Dublin City Council noted that a total of 46mm of rain had been recorded at the Mellowes Road rain gauge overnight, with 9.6mm falling in a single hour.
“Combined with already saturated ground conditions, this resulted in significant surface water runoff and a number of flooding incidents across the city,” it said.
“A full review of the event has commenced in parallel with ongoing responses, including the timeliness of weather warnings/forecasts. We recognise the distress flooding can cause for residents and businesses and will continue to provide updates as further verified information becomes available.”
Emergency crews were deployed throughout the night and continue to respond on Friday.
“While rainfall has eased, river levels remain elevated and conditions are being closely monitored,” the council said.
Significant impact was reported in several areas including Clongriffin and Ballymun, where flooding hit roads and properties.
There were early reports of flooding in the areas of Clongriffin, Swords, Santry, Rush and parts of the M1.
Junction 4 on the M1 at Donabate was affected, with the southbound slip road closed, Transport Infrastructure Ireland said.
Dublin Bus advised of diversions on four of its routes including the 16, 33, 41 and 41C due to flooding. It said those routes will divert at Coolock Lane on to the M1 to Dublin Airport due to flooding at Collinstown.
Bus Éireann said that flooding and rain have affected some of its services, including the 115 between Navan and Dublin and the NV1 route between Enfield and Dublin.
On Friday morning, DAA said that due to the heavy rainfall overnight, some roads leading to Dublin Airport are closed or “trickier than usual to navigate”.
Drivers have been advised to follow local diversions and take extra care. Flights are operating as normal.
Ireland will be cold and mainly dry over the weekend, with a status yellow ice warning coming into effect and the possibility of a little snow over higher ground.
Met Éireann has issued a status yellow low temperature and ice warning for the whole country from 9pm on Friday to 10am on Saturday.
Friday morning will see some frost and ice, especially in the west and the north of Ireland. Rain in Munster and south Leinster will clear through the morning, with mostly dry and sunny conditions following.
There will be a few isolated showers in the north and west, with highest temperatures of 3 to 7 degrees. It will then become very cold on Friday night.
While conditions will be mostly clear, some higher cloud will start to build from the Atlantic overnight. Lowest temperatures, as the weather warning sets in, are expected to be between -4 and 1 degrees.
On Saturday, it will be another frosty start. Spells of sunshine will follow, the best of them in the east. It will grow increasingly cloudy from the west through the day, as rain spreads northeastward through the afternoon and evening, turning heavy in parts.
There is a chance of some sleet, especially over higher ground, but it should stay mainly dry for much of the day in east Leinster and most of Ulster. Highest temperatures are again expected to be between 3 and 7 degrees.
Saturday night will be wet and windy for a time, with spells of heavy rain. There will be more sleet and possibly a little snow for a time over higher ground in the north and east. Lowest temperatures overnight will be between 1 and 5 degrees.
Sunday will be bright with sunshine and scattered showers, most of which will be widespread in the west and north. Some of the showers will be heavy, with a chance of hail and maybe the odd isolated thunderstorm near the coast. Highest temperatures will be 7 to 11 degrees.
Sunday night will be breezy, especially further to the west and northwest. There will be a mix of clear spells and scattered showers, some heavy, including hail and possibly sleet over higher ground.
More persistent rain is possible in parts of the north and northwest, with a greater chance of thunderstorms there too. Lowest temperatures will be 2 to 6 degrees, with increasing west to southwest winds.
