This mornings sailing to Heysham will set off an hour early.
The Ben-my-Chree voyage originally expected to leave at 8.45am will now depart at 7.45am with passengers asked to check in no later than 7.15pm.
The Steam Packet Company says the decision has been made due to a rapid deterioration in the weather forecast.
Other sailings this afternoon and tonight are currently unaffected.
New online Isle of Man guide for refugees and asylum seekers
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Lifeboat called to yacht's rescue
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Government reveals TT viewing figures
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Final wind farm hearings set for July
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Cocaine dealer to appeal 14-year jail term
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Infrastructure Minister defends road checks for cat’s eyes work
Roads are always inspected by the Department of Infrastructure before workers install cats eyes.
Beauty brand Charlotte Tilbury launches at Boots this weekend
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Isle of Man Energy confirms no gas price rise
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