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.
Repairs on Peel Power Station to get underway
Manx Care doctor survey to be discussed by Tynwald
Weather warning for snow tonight
MHK queries safety at primary school in Ballabeg
Gales put two ferry sailings at risk tonight
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night