Sailings to and from Heysham tonight and early tomorrow morning are facing potential disruption.
The Steam Packet Company is advising the 7.45pm Ben-my-Chree journey to the Lancashire port and its return at 2.15am on Tuesday morning are in doubt because of poor weather being forecast.
Officials say the master will make a final decision on both crossings by 5.30pm this evening.
Morning and afternoon services today are currently unaffected.
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