The Steam Packet Company says it'll make a decision by 5pm today about two ferry sailings tonight.
The Manxman's 7.15pm crossing from Douglas to Heysham and 2.15am return are both at risk.
Gale force winds are forecast to sweep the Irish Sea overnight.
A final decision on both voyages is due to be made by the vessel's master by 5pm.
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Stay safe for Hop Tu Naa tonight
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