BBC News
More than 150 flood warnings have been issued by Britain Met Office.
There are currently 17 severe flood warnings, which indicate danger to life, for Cumbria and Northumberland while north-west of England is now tagged as a red warning zone, which means no one should travel there unless it's absolutely essential.
Meanwhile, large parts of Scotland are on amber alert, meaning that those areas are potentially going to be flooded further.
In the Republic of Ireland, over 2,000 homes have been left without electricity due to the flooding. Hundreds of others in Wales and North Yorkshire are also without power.
However, Twitter is already awash with pictures of severe flooding, showing massive damage to roads, houses and public areas.
The bottom of our road turning into a lake - near Westport. #StormDesmond pic.twitter.com/SBWeK5zXYe
- Sabine Hiller (@SabineHiller) December 5, 2015
Just back from Keswick. The Greta is VERY high. Defences doing their job #flooding #StormDesmond pic.twitter.com/NPOCfLBV3h
- BlencathraFSC (@BlencathraFSC) December 5, 2015
River breaching flood defences on High Hill #keswick #StormDesmond pic.twitter.com/DxvEvF9szh
- daylightrobber (@daylightrobber) December 5, 2015
BBC
Three hours later finally open road home #cork#traffic
- Jamie O'Brien (@jamieo57) December 3, 2015
At this rate the people stuck on the South Link may still be there for the mornings traffic jam! #nightofthebigtraffic #CorkTraffic
- Neil Murphy (@neilsmurfy) December 3, 2015