Bad weather may cause disruption to the Thursday morning's ferry out of Lochboisdale and Castlebay.
Cal Mac said the MV Clansman's voyage to Oban is on amber alert.
Wind conditions may touch severe gale levels with windspeeds of around 50mph forecast for the area at departure time.
A high swell running up the southern Minch is expected over the day and may particularly affect seas around Uist and Barra in the morning.
Clansman on amber
20 January 2016