The Met Office this evening and have just issued a yellow weather warning for Ice for the Western Isles. this warning comes into force at 23:00 this evening and expires at 10:00 Thursday morning.
Here is the link to the council gritting policy https://www.cne-siar.gov.uk/roads-travel-and-parking/roads-maintenance-winter-gritting/ and road gritting times https://www.cne-siar.gov.uk/roads-travel-and-parking/roads-maintenance-winter-gritting/road-gritting-priorities/
There are also road cameras on the Clisham and Barvas Moor which is a good way to look at the wintry conditions.
Please do NOT use Western Isles Weather for the protection of life and property please follow local and national government issued warnings and advice. Please have more than one source for weather information in extreme weather, Such as the Met office and follow any advice and instructions from emergency responders.