More sailings on Thursday are under threat from bad weather which is being forecast.
Voyages to Heysham tonight at 7.45pm and back to the Island at 2.15am tomorrow are already in doubt and now Thursday's 8.45am and 2.15pm services are also looking at potential disruption.
A final decision on this evenings crossing and early on Thursday will be made by 5.30pm today.
Meanwhile, a verdict on the services at 8.45am and 2.15pm on Thursday will be made no later than 7am tomorrow.
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