The Steam Packet company says two of its sailings later this week may be at risk of disruption.
Gale force winds are forecast, and the company says the Manxman's 7.15pm Douglas to Heysham trip on Friday could be at risk.
Also under threat is her return voyage at 1.45am on Saturday morning.
A final decision is due to be made by the vessel's master by 5pm on Friday.
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