Water levels around the UK could be higher than in the storm surge of 1953, but thanks to flood defences the impact is likely to be smaller.
Many coastal areas face flood warnings and high winds are causing more widespread problems, ahead of tomorrow's cold snap.
Public Health England has issued guidelines on how to prepare for potential flooding as high winds sweep the country
Thousands of people were evacuated from their homes as a tidal surge hit coastal towns along the east coast of Britain.
The surge, predicted to be the worst for more than 60 years, hit the north Norfolk coast early in the evening and was expected to head south throughout the night.
The Environment Agency (EA) has issued a number of severe flood warnings - the highest category, which are only issued when flooding poses a danger to life - covering coastal areas in East Anglia, the Midlands and Kent.
Around 1,500 properties in Norfolk who are without power as a result of the storm, 1,200 in Essex and about 1,000 in Suffolk.
Statement from UK Power Networks:
– UK Power Networks
"UK Power Networks is continuing to keep in regular contact with the Met Office and the Environment Agency to monitor weather conditions and predicted flooding for the East coast.
"As part of this work, we have installed flood prevention measures at key substations in at-risk coastal areas. If there’s a possibility that flood water will affect our equipment our first priority must always be safety.
"We may have to turn off peoples’ electricity supplies but only as a last resort for safety reasons and of course, we would switch the mains supply on again as soon as possible."
High waves and strong winds have hit the East coast, affecting areas of Lincolnshire and the East Riding of Yorkshire.
More properties were being evacuated in Kent tonight - 70 in Seasalter and 200 in Faversham - ahead of expected flooding in the early hours of tomorrow.
A Kent County Council spokesman said:
The Environment Agency and Met Office are forecasting that there is a significant risk to people and property as tides combine with a coastal surge and significant waves, overnight and again on Friday afternoon.
For those who are unable to find alternative accommodation, we are working with our colleagues in Dover District Council, Canterbury City Council, Swale Borough Council, the NHS and the voluntary sector to ensure residents' welfare needs, including feeding and bedding, are catered for at evacuation centres.
Community wardens and police officers are making door-to-door visits.
The Ministry of Defence said "a small number of personnel" had been drafted in to help local authorities deal with flooding in Norfolk.Major Simon Ward, of the Light Dragoons, told the Eastern Daily Press that 65 troops from B and C squadrons are on stand-by at Gorleston fire station.He said:
We're still awaiting tasking from the fire service, but we've undergone some training in flood barrier erection and are waiting to assist should we need to.
The Environment Agency says water levels of 5.8 metres are the highest ever recorded in Hull, as storm conditions have created a tidal swell.
Eight Severe Flood Warnings and 34 Flood Warnings have been issued by the Agency across the region.