Thomas Frost was last seen on Saturday evening (11 February) at his parents' home in St Ouen.
The States of Jersey Police and Jersey Fire & Rescue are still looking for the missing 51-year-old.
Officers are using drones to scan the northwest coast and the Fire Service is searching nearby Val De Le Mare reservoir with the inshore rescue vessel.
Mr Frost is described as 6ft with a medium build and could be wearing a grey hoodie, navy shirt and navy jeans. There is also a possibility he is not wearing shoes.
Anyone with any information that can help police with their investigation is asked to call police on 01534 612612, option 2, option 4.
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