The biggest wave ever to hit Irish shores has been recorded, weather experts have revealed.
The monster 67-footer was measured at a special buoy off the Donegal coast on Tuesday as a force 10 storm raged across the north coast.
Meteorologists at Met Eireann said data from the sea conditions about 60 miles to sea were the most severe it has encountered that distance offshore.
"The M4 weather buoy off the Donegal coast recorded a maximum wave height of 20.4 metres which is the highest maximum wave recorded in Irish waters," Met Eireann reported.
At Malin Head, the northerly most tip of Ireland, wind gusting to 140kmph was recorded.
Elsewhere, the Irish Coast Guard has urged people to stay off exposed coasts, cliffs, piers, harbour walls, beaches, promenades during this week's forecast stormy weather.
Winds and stormy conditions will ease before freezing conditions hit Ireland on Thursday and there is a risk of a second storm hitting the south and midlands. Forecasters, however, said there is a chance the storm may miss Ireland to the south.
The Weather Buoy project is a collaborative project between the Department of Transport, Marine Institute, Met Eireann and the UK Met Office.
Manager of the Irish Coast Guard, Declan Geoghegan said: "The combination of tides, forecasted gale warnings for the next day or so, high sea conditions and swollen rivers may result in very dangerous conditions."
Noel Brett, CEO, Road Safety Authority said: "I would ask each and every road user to use the roads safely over the coming week. With bad weather forecast, we need to be prepared for these severe weather conditions of stormy winds, patches of ice and snow showers."