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.
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Any showers in the north will clear away quickly to leave a dry and bright day with plenty of sunny spells.
The rain will continue to push southeastwards this evening. Drier and colder by dawn. Sunny spells throughout the day tomorrow