A farmer has had a lucky escape after his tractor got caught up in a bridge collapse in Donegal yesterday.
The bridge collapsed on the road from Muff to Iskaheen as a result of the heavy floodwaters.
Meanwhile, in Derry farmers are helping with rescue to clean up the floodwaters.
Dramatic photographs and videos are emerging online hours after the north and north-west of the country experienced never-before-seen weather conditions.
Met Eireann forecaster John Eagleton said the rain was more akin to something you would see in continental Europe rather than Ireland.
The storm swept in from the Atlantic before hitting Donegal and then covering Northern Ireland.
Parts of the north and north west were hit with flooding as four inches of rain fell in just 24 hours.
Driving conditions in parts of Donegal and Derry saw many motorists having to abandon their vehicles. The Foyle Arena in Derry was opened as a rest centre due to the number of motorists stranded by floods in the city.
Photographs on social media site show the aftermath of the floods, including a bridge collapse in Claudy, Co Derry.
Locals awoke this morning to find the bridge impassable, and the centre of the bridge washed away.
Meanwhile, video footage has emerged of vehicles which were parked in a park-and-ride at Drumahoe, Co Derry being washed away in flash floods.
Forecaster Mr Eagleton said: "There was a band of rain that crossed right over the north west and Northern Ireland. It was very very intense and was closer to something you would see in parts of continental Europe rather than Ireland."
The forecaster said around four inches of water fell in just 24 hours.
"To put that into context. On a really wet day in Dublin you would typically get around an inch of rain. This is four to five wet days condensed into one. Approximately a month's rain fell in a day."
One local woman told RTE Radio One's Morning Ireland; "The weather has been atrocious.
"We've seen cars being taken away on tow-vans, everything.
"They're actually walking four foot into the water. That's how deep the water is with the floods."
Another said; "I have never seen anything like this. It was terrifying. When I saw the water come over the bonnet of the car, I was actually terrified."
Worst drive of my life from Sligo tonight and now stranded in Derry with no acces to Home in Donegal worst weather I've ever seen pic.twitter.com/ho94Lz1q76