Manannan sailings to Liverpool and from on Wednesday are at risk of disruption because of forecast high winds.
The fastcraft’s 3pm sailing to Merseyside from Douglas and the return journey at 7.45pm could both be cancelled.
Final decisions will be made by the Master of the ship by 1pm tomorrow.
The 3.15am Manannan sailing on Thursday morning is also at risk of disruption. A decision will be made on this by 6pm on Wednesday evening.