Communities in Maldon, in Essex, are being advised to move pets to safety, avoid coastal paths and promenades, and postpone road journeys where possible.
It comes as the Environment Agency issued flood warnings for Norfolk, Suffolk and Essex.
High tide is expected in Maldon just before 5pm.
The Environment Agency is warning that businesses and homes alongs the waterfront and The Hythe could be at risk.
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Saturday will be largely cloudy with a continued risk of heavy showers or thunderstorms. Sunday will be dry with sunny spells.
There continues to be a risk of thunder tonight and tomorrow but the weather will become drier and clearer by sunday.
The Chief Exec of car manufacturer Lotus has said he is deeply sorry to announce job losses at the company's head quarters in Norfolk.