Poor conditions expected tomorrow means more of Friday's sailings are now in doubt.
Tomorrows 8.45am service to Heysham and its return at 2.15pm face potential disruption due to the poor weather which is forecast - a decision on both services will be made by 7am on Friday.
It comes after the Steam Packet Company already announced the 7.45pm Ben-my-Chree voyage to the Lancashire port tomorrow is also subject to delays or cancellations.
A final call on that crossing and its 2.15am return on Saturday will be made by 5.30pm tomorrow evening.
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