Officers are called to a property on Morawelon Road, Holyhead and a 61-year-old man is arrested.
Authorities said they were dealing with flooding and fallen trees as Storm Boelo followed Storm Austen.
Adrian McAnarney fell from Crib Goch in Eryri National Park, also known as Snowdonia.
Michael Anthony Ward's family paid tribute to him, describing him as a "loving father with a big heart".
Martin Joseph Ward was arrested after the body of his father Michael Anthony Ward was found on 17 October.
Police have launched an investigation and say there will be an increased presence in the area.
The North Wales Coast line will close for four weeks in January 2027 for work to be carried out.
Operators have brought in new rules if you are travelling by ferry from Britain to the Republic of Ireland.
