This evening's Steam Packet 7.45pm sailing from Douglas to Heysham might be cancelled or disrupted because of adverse weather conditions.
The company says a decision will be made by 5.30pm.
The 2.15am return sailing will obviously be affected too.
The Steam Packet has now says that the Friday night's 8.30pm sailing is also at risk of not sailing.
The daytime sailings tomorrow (leaving Douglas at 8.30pm, returning at 2.15am) are unaffected.