The Steam Packet Company has cancelled two sailings in the face of bad weather.
The Manxman's 7.45pm Douglas to Heysham sailing and her return trip at 2.15am have both been called off.
Two sailings tomorrow are also at risk - the 8.45am crossing from Douglas and 2.15pm return from Heysham.
A decision on those is expected to be made by 7am on Tuesday.
Local authority: don't suffer in silence at Xmas
Government reminder over salt bins
Weather warning in place for high tides
White Boys touring Island today
Road closed after crash
Worries about fire pollution in Glen Maye
UK businessman wants to hear about mobile signal at sea
Minister quizzed over new Meat Plant director