The Children's Hospital for Wales in Cardiff has been closed due to damage caused by heavy rainfall.
18 children being treated there have been moved to other wards at the University Hospital of Wales.
The hospital was closed and patients moved on Monday afternoon.
Nobody was injured.
Cardiff and Vale University Health Board says it doesn't expect the hospital to reopen before the end of the week, as damage to electrics is examined.
More top news
Breezy overnight. It will become fairly cloudy as the night progresses.
It should turn cloudier through the early hours with some patchy drizzle and some hill fog too.
It will be a breezy day with variable amounts of cloud and some bright or sunny spells.