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Flood alerts are in force along large parts of the Kent coast and stretches of river.
The Environment Agency say high tides overnight and on Monday morning could affect low lying land and roads nearest to the water.
The rising water is expected to peak at midnight but flooding is possible two hours either side of that time - from 10pm tonight until 2am tomorrow.
Dartford to All Hallows, the Medway estuary and Isle of Grain, the Isle of Sheppey and parts of Swale and the coast from Whitstable to Margate are all expected to be affected.
At this stage it is not thought any properties will be flooded but the situation is being closely monitored.
Environment Agency staff are operating defences and structures and are prepared to respond if required.
Another alert covers land from St Margaret's at Cliffe to Sandgate, including the Port of Dover.
A high tide is expected at 10.45am on Monday but flooding could happen between 8.45am and 12.15pm.
We are being warned to be careful along beaches, promenades, coastal footpaths and roads as large waves and sea spray could be dangerous.
Higher than normal tides are expected over the next four days.
For all the forecasts, warnings and weather related news, click here.