South Wales Police said they were involved in two separate water searches from the swollen River Taff on Tuesday.
A spokeswoman said emergency services were searching the River Taff in Cardiff following reports of a person having entered the water near the Principality Stadium shortly before 8.40am, while a river search was under way in the river in Taff’s Well following reports of a canoeist having capsized.
A woman was also rescued at the River Ely in Leckwith following reports of a person in difficulty, the force said on Twitter.
Winds have reached up to 80mph
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Meanwhile, fire crews had to rescue holidaymakers from a flooded campsite in the town of St Clears, Carmarthenshire, after river levels rose in the area.
Mid and West Wales Fire and Rescue Service said nine people and two dogs were rescued by fire service personnel using a swift rescue sledge, lines and wading gear.
Crews also gave medical treatment to one man and evacuated 30 other people from a flooded caravan site in Wiseman’s Bridge, Narberth, while 12 caravans were also removed from the site.
A number of homes in Wales were also said to have been hit by flooding in Llanelli, Neath, Whitland and Tonyrefail, while some roads across the country were left underwater.
Elsewhere, travellers were warned of flooding disrupting rail services and trees blocking roads on Tuesday morning.
Parts of the UK have seen flooding
PA
According to the Met Office, gusts of 67mph were recorded at the Isles of Scilly between 8am and 9am on Tuesday morning, while they reached 73mph at the Needles on the Isle of Wight in the same period.
Three Met Office yellow weather warnings of heavy rain or strong winds cover most of the UK on Tuesday, with stormy conditions expected to last until Wednesday morning.
Warnings of rain cover Northern Ireland, southern Scotland, northern England and parts of North Wales.
As of midday on Tuesday, the Environment Agency had issued 22 flood alerts for England, largely in the South West and West Midlands.
Natural Resources Wales had put out three flood warnings – advising immediate action – and 17 flood alerts for rivers across the south west.
The Met Office has never had two named storms in August since the process started in 2015, but Francis comes on the back of Ellen, which struck last week and caused power outages.