The alert from the Environment Agency covers The River Bure, Spixworth Beck and the surrounding area.
Areas from the north of Norwich to Bodham, including Aylsham and North Walsham, are also included in the flood area.
People are being urged to avoid using low-lying footpaths or entering areas prone to flooding.
READ MORE: Norfolk enjoys hottest day of the year
It comes as The Met Office is forecasting rain until 11am in the affected areas.
The worst of the rain is set to fall before 9am, with at least an 80pc chance of precipitation.
On Sunday, Norfolk enjoyed its warmest day of the year so far as temperatures reached 21C.
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