The Environment Agency warning is in place for the tidal Rivers Bure, Ant and Thurne on Friday morning.
It is due to high tides combined with high river flows from upstream.
A spokesman for the agency said: “We expect to see high water levels around Potter Heigham, Wroxham boat yards and Ferry Road in Horning.
“The Broads and river levels will remain high due to tide locking and rainfall.
“We are closely monitoring the situation.
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“Avoid low-lying roads near rivers, which may be flooded.”
The alert coincides with a Met Office yellow warning for heavy rain due to Storm Claudia.
The warning has been issued for the county between 6am on Friday and 6am on Saturday.
The Met Office said there will be heavy and prolonged rainfall, which may lead to flooding in some areas.
Disruption includes the chance of power cuts and loss of other services to some homes and businesses.
The rain could also lead to difficult driving conditions, road closures and cancellations of bus and train services.