People have been warned to stay away from Welsh coasts as high winds coincide with high tides. There are eight flood warnings and 23 flood alerts in place across Wales, mainly on coastal areas.
Natural Resources Wales is urging people living near or visiting the Welsh coast to be prepared for coastal flooding impacts on Tuesday and Wednesday.
The warning comes as strong wind and large waves could cause a storm surge that could cause overtopping of defences in places. They say that if you live near to, or are visiting a coastal area, please take extra care and keep a safe distance from coastal paths and promenades which may be affected by strong winds and spray.
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There is a warning that flooding is coming over sea defences on the A55 in north wales. One lane has been closed eastbound at Penmaenbach Headland because of the amount of water on the carriageway. There was also a landslip in Ystradgynlais.
In England, more than 200 people have been evacuated in West Sussex after the River Arun burst its banks, amid warnings that "flooding may increase" throughout Tuesday.
The evacuations included around 180 people rescued overnight from Medmerry Holiday Park in Earnley and around 15 from Ferry Road and Rope Walk in Littlehampton, West Sussex County Council said. One person showing signs of hypothermia was taken to hospital.
The council said evacuations of "around 20 people" were under way on Tuesday morning from Bracklesham Caravan and Boat Club.
Forecasters warned that heavy rain and strong winds would continue to batter parts of western Wales, southern England , Northern Ireland and Scotland over the next few days.
In a statement, West Sussex County Council said: "At around midnight we were alerted to the first flooding incident in Littlehampton, which primarily affected Ferry Road and Rope Walk. In total, 15 people were evacuated. Shortly after 1am we then responded to a flooding incident at Medmerry Holiday Park, Earnley. In total around 180 people were evacuated.
"South East Coast Ambulance Service have assessed and triaged a number of people at a nearby facility, and one person showing signs of hypothermia has been taken to hospital at this time.
"Fire crews have now left both incidents, and the situation in these two areas will be closely monitored throughout the day.
"And finally, at around 6.40am crews were made aware of flooding at Bracklesham Caravan and Boat Club. Evacuations of around 20 people are under way.
"The water levels have not yet receded and those who have been evacuated remain displaced. It is also possible that the flooding may increase throughout the day."
A yellow weather warning for Wales's west coast is in place until 3pm on Tuesday, when "a spell of strong winds" will affect the region.
