People living on low-lying land in East Anglia have been warned strong winds combined with expected high tides could cause flooding this weekend.
The Environment Agency said "higher than normal" seasonal tides were predicted for Saturday and Monday.
Storms could cause flood problems in areas of Cambridgeshire, Essex, Norfolk and Suffolk.
"Tides will only be four centimetres higher than normal but severe weather increases the risk," a spokesman said.
People warned
Experts have said existing flood defences can cope with high tides.
"We are only likely to experience problems if the high tides happen at the same time as adverse weather like strong winds, storm surge and waves, associated with a low-pressure weather system," the agency spokesman said.
"The high tides should pass with no consequences. But at this stage, we can't say whether there will definitely be no flooding.
"If the worst happens, the Environment Agency and emergency services will initiate tried and tested procedures."
He said officials would aim to predict floods and warn locals.