Around 9,000 homes in Great Yarmouth in Norfolk are to be evacuated after severe flood warnings.
Norfolk Police say people affected should make arrangements to stay with friends or relatives.
For those who cannot do this rest centres will be set up from 2pm at the following locations:
Flegg High, Martham Primary, Caister High, Cliff Park High, Orimiston Venture Academy and Lynn Grove High from 3pm.
Rest centres will also be set up at Alderman Peel High School in Market Lane in Wells and at Hunstanton Community Centre in Avenue Road for those affected.
Sandbag locations for the Yarmouth area include Beach Coach Station, Pasteur Road car park (opposite Toops Tiles), Southgates Road, Quay Road, Gorleston and the Runham Road junction.
This will be a 36-48 hour evacuation which covers three anticipated high tides.
Norfolk’s Deputy Chief Constable Charlie Hall, who is leading the multi-agency response, said: "This is a significant policing operation underlined by the number of people and properties affected over the next two days.
"We understand people may be anxious, but we would like to reassure residents that Norfolk has tried and tested flood response plans which are being put in place, in line with Environment Agency advice.
"Such disruptions are entirely necessary to ensure the safety of everyone involved and for the evacuation to be conducted in a planned and organised manner.”
In Wells Pinewood Caravan Park have evacuated 22 touring vans (site manager's decision).
61 properties will be evacuated at 4pm in the East Quay, The Quay and Freeman Street areas.
The flood barrier at Wells will be closed at 5pm alongside the following roads; Polka Road, Stanley Road and Freeman Street.
In Blakeney 30 properties are to be evacuated. The Blakeney Hotel has 66 people staying they will be closing the flood door.
In Salthouse some 23 properties will be evacuated and at 5pm a road closure will be put in place on the A149 coast road.
Walcott has 52 properties to be evacuated and the coast road will be closed.
The South Quay car park in King’s Lynn along the quay side will be closed from 3pm. Anyone parking their car is asked to remove it before this time.
Shepherd’s Port area of Snettisham, coastal areas of Heacham and South Hunstanton have received evacuation notices.
Roads due to be closed in such areas include South Beach Road in Hunstanton (from the top of the road at Oasis Way roundabout), Jubliee Road (near North Beach and the flood defence) and South Beach (near the flood defences) in Heacham and Beach Road in Snettisham.