"It's not good news for Wales in particular," she said.
An Environment Agency spokesman said more flooding could be expected because river levels were already high.
The clean-up operation has begun in Morpeth, Northumberland, where an estimated 1,000 properties were flooded on Saturday and hundreds of people had to spend the night in temporary accommodation.
Floods minister John Healey is to visit the town to see the damage and meet some of the emergency teams who helped with the weekend's rescue effort.
Northumberland County Council member Andrew Tebbutt said Morpeth had been "virtually cut off" from the outside world by the rising water after the River Wansbeck burst its banks, but the situation had "eased considerably".
Clean-up underway following floods in Morpeth
Council officials say it will be months before everyone affected will be allowed back into their homes.
In the West Midlands, meanwhile, several homes had to be evacuated, and some patients were moved from Selly Oak Hospital's flooded Brain Injury Clinic. At least one school - Shenley Court School, in Northfield - was closed on Monday because of flooding.
In Shropshire, flood barriers are in place around Shrewsbury and Ironbridge, and a couple of schools were closed on Monday.
In Gloucestershire, some 25 sheep died and 45 were rescued on Monday after becoming trapped by rising flood water from the River Severn at Staplins Farm in Coombe Hill.
People have been advised to keep updated through news outlets and to call the Floodline on 0845 988 1188.
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