A severe gale is due to batter the islands on Monday.
Conditions could increase to storm level with thunder and lightning expected.
The Met Office said gusts could reach 80 mph on Lewis.
It added: “Another rapidly deepening area of low pressure will develop over the North Atlantic during Sunday night, bringing severe southwesterly gales to the far north and northwest of Scotland with gusts of 70 mph.”
People are warned of the risk of further disruption to both transport and power supplies.
Severe gale set to hit Western Isles
11 January 2015