The Steam Packet Company says sailings tonight could be under threat because of bad weather.
The Manxman's 7.45pm Douglas to Heysham trip and her return voyage setting off at 2.15am could both be affected.
A final decision is due to be made by the ship's master at 5.30pm.
The Met Office is predicting strong winds this evening and tonight, although no weather warning has been issued.
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