After more heavy rain in North Wales overnight, the River Elwy has burst past flood defences. Residents have been warned to evacuate 500 properties.
The BBC's Hywel Griffiths, who is in St Asaph, told the Today programme: "There's nowhere for this water to go now, the ground's saturated, the rivers are swollen."
"It's going to be an uncertain day for many people, I've seen them walking in with water risen up to their knees - they'll be hoping that those levels don't rise as their homes are left empty."
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