The Steam Packet says two sailings overnight have been called off.
Bad weather means the Manxman's 7.15pm Douglas to Heysham crossing and her return trip at 1.45am have both been cancelled.
Also at risk are her 8am Douglas to Heysham voyage tomorrow, Wednesday, March 25, and her 1.45pm return sailing.
A decision on those is expected to be made by 6am tomorrow morning.
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