The Ben-my-Chree's 14:15 departure from Heysham this afternoon (Wednesday) will now leave at 13:30.
That's the latest from the Isle of Man Steam Packet which said all other sailings are currently scheduled to leave/arrive on time.
A spokesman said the timetable change is "due to a rapid deterioration in the latest weather forecast".
Passengers are requested to check in no later than 13:00.
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