A huge clean-up operation is underway in Northern Ireland, after three-quarters of the rain expected to fall in the whole of August fell on Saturday.
Roads turned into rivers, with ALL the main roads in and out of Belfast, the capital city, affected.
Some cars struggled to make it through the deep flood waters...
But some didn't make it through at all, and had to be abandoned.
Rivers burst their banks, and bridges were washed away.
Police warned people not to leave their houses, but in Newcastle, County Down, 80 people were forced from their homes, and had to shelter in a community centre.
Emergency services worked through the night to repair the damage, and are now hoping the weather will hold long enough to get things back to normal.