The Steam Packet Company says tonight's sailing from Douglas to Heysham will now leave early because of adverse weather conditions.
The 7.45pm crossing has been brought forward to 7pm because of Storm Emma.
The return service at 2.15am is now also set to depart at 1am.
Tomorrow and Friday's sailings are subject to cancellation or disruption, the Steam Packet says it'll make a decision by 7am tomorrow.
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