Strong winds mean two of the Manxman's sailings could be called off later.
The Douglas to Heysham sailing at 7.45pm and her return trip setting off at 2.15am on Friday morning are both under threat.
The Steam Packet says a final decision will be made by 5.30pm.
Forecasters say winds of up to 55mph may sweep the Island later.
Where has government found £11m in savings?
Is there border security for Irish sailings?
Emergency powers used to fell trees
Busy road in West to close next week
Free period products would cost £90k in 1st year
MHK wants to know about bail condition breaches
1,500 A&E patients weren't registered with GP
Will the Island's mad cow disease risk status improve?