All of the Manxman's sailings tomorrow are at risk of disruption because of bad weather.
The Steam Packet Company says a decision on the vessel's 1.45am Heysham to Douglas crossing will be made by 5pm today.
Also at risk is her return trip at 8am - a decision on that sailing is expected by 5.30am tomorrow.
Meanwhile, the ferry's master will decide on her 1.45pm crossing at 8am, while an announcement is expected about her 7.15pm return by 5pm on Tuesday.
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