Tina Thomas, 44, was engulfed and nearly swept out to sea by the crashing wave as her and her husband Ashley, 46, were taking their dog Apollo for a walk along the Swansea Marina on Friday.
Areas in London and the south of England, the Highlands and north east of Scotland and Northern Ireland are all set to be lashed over the next few days.
A shopping centre in East Sussex has been evacuated due to flooding, as huge downpours continue to batter Britain and more than 100 flood alerts are issued.