UK weather: Welsh coastline is pummelled by waves
6 January 2014 Last updated at 19:13 GMT
All buildings along the promenade in Aberystwyth are being evacuated in anticipation of further high tides and an "exceptional" wave swell.
Residents are being warned to vacate properties as soon as possible and use a nearby support centre that has been provided.
About 150 students in seafront flats have been moved out until Wednesday.
Arwyn Jones reports.