Businesses in Newry, County Down, have been damaged after the city's canal burst its banks on Monday night
Portadown, Downpatrick, Templepatrick and Ballynahinch are among the other areas badly affected
More than 12,000 sandbags have been deployed to the worst affected areas of Northern Ireland
The Met Office has cancelled a yellow rain warning for NI for Thursday as Storm Ciarán hits other parts of the UK
We're wrapping up our live coverage now after severe flooding caused chaos for a second day in Northern Ireland.
While the live page will be closing, you can keep up to date with the latest on the BBC News NI website throughout the evening.
Catherine Morrison
BBC News NI reporter in Downpatrick
In Downpatrick, more than a dozen businesses have been flooded on Market Street.
Water is flowing in front of the St Patrick’s Centre straight into shops and pubs.
The road has been closed but some cars are still driving through, sending torrents into premises.
Water levels have been rising steadily all afternoon and tractors bringing pumps to flush out floodwater have been coming throughout the day.
The Quoile River has also burst its banks on to the main Belfast Road into the town, which is closed to traffic.
Police say the Old Belfast Road, Strangford Road and Quoile Road are also closed.
Translink have said Ulsterbus services operating via Downpatrick have also been affected, with disruptions and delays expected.
While counties Down, Armagh and Antrim have seen the worst of the flooding, heavy rain has also affected other parts of Northern Ireland.
In County Tyrone, a recovery operation is under way after a fuel lorry got stuck in flood waters.
As darkness falls, crews are working to help the vehicle at the Reenaderry Road in Derrytresk.
Image source, Getty ImagesThis weekend's Down Royal meeting is off following the heavy rain and has been rescheduled for 10-11 November.
The two-day meet at the venue near Lisburn was scheduled to start on Friday with the Champion Chase to run on Saturday.
Clerk of the course Tracey O'Meara said 25mm of rain overnight on Tuesday left "significant amounts of water lying in some areas" of the track.
The decision to postponed the meeting was made on Wednesday afternoon.
The DfI says it is part of a multi-agency response in order to deal with the scale of the flooding.
Additional staff are in place to help deal with the many incidents that the DfI need to respond to, Mr Lavery says.
He says the department would have about 400 staff working on a normal day, but additional contractors are in place to help deal with the scale of response needed.
"Our planning for this and preparation, I think, has saved many people and property from harm," he tells the BBC.
"We would always like to have additional staff - don't get me wrong of course - and resources, but it's a good news story that we have been able to partner up and help meet demand as much as we can."
He says staff are currently working in shift patterns to avoid "burning them out".
Image source, ReutersPeople in high vis jackets look on at flood water in Newry
Department for Infrastructure (DfI) staff are working double-shifts throughout the night to help assist those worst affected.
The DfI's Paddy Lavery says they are in "reactive mode" and are attending many calls.
Mr Lavery says they are prioritising safety for individuals and protection of property.
He says they have received 1,300 calls from Monday, adding that 20,000 sandbags have been prepared and distributed to those in need.
Jonny Ross, operations manager of Ground Coffee, has just returned from the company's Portadown store, which has been badly affected by flooding.
"It's pretty grim," Mr Ross tells BBC Radio Ulster's evening Extra.
"We operate a lovely little coffee shop on the banks of the River Bann and it sits about 20m above the river," he says.
"The river is now about 20ft higher than what it usually runs and unfortunately, we are about ankle-deep [in water] inside the shop now."
Mr Ross praises staff who were able to take some "preventative action" and get stock removed and protect equipment before the flood water hit.
He says they will access damage tomorrow morning in terms of electrics and plumbing but hopes they will be able to get the kettle back on soon and serve coffees and teas to customers again very soon.
Train passengers entering Lisburn Station from its rear entrace were met with a wet scene earlier.
Image source, Annagh UnitedNIFL Championship Annagh United are one of many sports teams affected by the weather.
The Portadown-based side saw their ground flooded and their recently refurbished clubhouse surrounded.
The club tweeted: "To say we are devastated would be an understatement but we are working hard to protect what we can at both our club and helping the surrounding houses.
"Please avoid the Annagh area as the water is deep and the road is closed."
The head of the Northern Ireland Civil Service says colleagues have been working around the clock to mitigate the effects of the extreme weather.
Image source, Reuters"It is very distressing to see the impact this is having on families and businesses and whilst this remains an unfolding situation, the response continues on the ground," says Jayne Brady.
"Our priority is, as far as possible, to prevent risk to life and property.
"In the coming days, the focus will move to recovery - a cross-departmental group has been established to ensure that everything that can be done is being done and to co-ordinate central and local government efforts to support people and businesses over the coming days and weeks."
If you're about to set out in your car - here's an up to date list of road closures from Trafficwatch NI, external.
County Down
County Armagh
County Antrim
County Tyrone
Barra Best
BBC News NI weather presenter
It was the wettest October on record for both County Armagh and County Down.
According to the Met Office, it was the fifth wettest October on record for Northern Ireland as a whole.
The Derryscollop Road in Armagh is one of the many rural roads closed
191.8mm of rain was recorded over the month – that’s 68% more than normal.
Average rainfall in October is normally around 114.41mm.
Image source, Ballynahinch United FCBallynahinch United Football Club has been working hard to protect its clubhouse as the river nearby has burst its banks.
Gilbert Cromie is the club chairman and said they've tried their best to save what they can.
"We got a lot of help from people yesterday bringing sandbags, councillors coming down to help too but the water is pouring from the car park onto the pitch.
"It will take sometime to dry out - the pitch won't be playable for a few weeks.
"The football club has been going for 55 years. If it gets any worse, it will cause a very serious situation for us - but the water hasn't gotten into the clubhouse yet."
Ita Dungan
BBC News NI
Nic Kane had to use his initiative this morning to get to an important hospital appointment in Belfast.
The family car was submerged in their driveway in Templepatrick.
He asked the driver of a 40ft lorry to bring him beyond the floodwater and from there a friend gave him a lift to the hospital.
The basement and garage of the family home had over 60cms of floodwater inside.
Image source, Dale McCroryAlliance Upper Bann MLA Eóin Tennyson says there's been anxiety for households and businesses affected by flooding in Portadown.
However, he says the situation has been made worse by the lack of a sitting Stormont.
"We should have an executive in place to coordinate a response, provide reassurance and offer clarity in terms of available support," he says.
Image source, Dale McCroryHe has written to the Department of Finance and Northern Ireland secretary urging that a support package, including appropriate rates relief, be put in place.
He adds that the local chamber, the Department for Infrastructure and council have been "working around the clock" to help.
There's been quite a bit of travel disruption these past few days due to the extreme weather conditions.
Translink has asked people to allow for delays and disruption to trains this afternoon.
Anyone hoping to park in Portadown Train Station carpark should think again as it's been closed due to flooding.
County Down man Ciaran Bonner took this video of Dundrum Cricket Club's grounds which have been badly affected by past floods.
This latest bout of bad weather has flooded the County Down club's pitch.
Dundrum Cricket Club under water
Jimmy Quinn’s house in Derrytresk, County Tyrone, is surrounded by floodwater.
He says, while his house has flooded in the past, “this would be the worst”.
"I was down there twice this morning, but I’m not going down again. It’s too deep," he says.
Jimmy has had to decamp to a relative's house in the meantime.
Ita Dungan
BBC News NI
Paul Grugdings of Templepatrick Dental in County Antrim says he does not know how long the practice will have close due to early morning flooding.
The main computer is down and the practice has been unable to contact patients to tell them it has had to close.
Paul says they may have to wait for an RQIA inspection before reopening.
There has been localised flooding in the past but water has never got into the building.
Newry ice-cream shop owner Michael Nugent says he was only able to see the damage in the shop for the first time on Wednesday.
It was under 3ft of water and a lot of the electrical appliances and stock were ruined.
"We’re trying to salvage as much as we can, but all in all it could be £100,000 worth lost in this store," he said.
“We aren’t going to be reopening at this site any time soon.”