Three Steam Packet sailings are at risk over the next 24 hours.
Moderate to rough seas are expected later today into tomorrow as the wind picks up.
The sailings at risk are the 1:45pm sailing from Heysham to Douglas, with a decision due to be made by 8am this morning.
Following that, the 7:15pm sailing from Douglas and overnight return from Lancashire are also at risk.
A decision on the overnight crossing will be made this evening.