Milford Haven Coastguard says a man is being treated for smoke inhalation after his boat caught fire near Aberystwyth this morning
A spokesperson said the boat is believed to be from the area.
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Feeling humid with heavy showers and thunderstorms moving north overnight into Sunday.
Four people, including three children, were taken to hospital to be checked for smoke inhalation.
Heavy rain and thunderstorms will affect many parts of Wales this weekend - particularly during Saturday evening.