Six sailings are at risk of disruption over the weekend, with two already brought forward.
Manannan’s 7:15am Saturday sailing to Liverpool will leave at 6:15am, with the return sailing also leaving an hour earlier.
All other Saturday sailings are at risk of disruption, including Manxman’s Heysham routes and the afternoon/evening Liverpool return trip.
A decision will be made on the morning Heysham sailing and 2:15pm return by 6:30am on Saturday.
Decisions will also be taken on the later sailings, including the 2:15am sailing on Sunday morning from Heysham, throughout the day.