Two more of the Manxman's sailings may have to be called off in the face of bad weather conditions.
Her 7.45pm trip to Heysham and 2.15am return journey today are at risk of disruption, with a decision due at 5.30pm.
But now the Steam Packet Company says also at risk are her 8.45am Heysham and 2.15pm Douglas sailings on Wednesday.
The ship's master will make a final decision on those crossings by 7am tomorrow.