A number of snow ploughs and gritters are travelling up and down the A9 to keep it moving through the amber warning period. Storm Bert could bring up to 30cm of snow today as wintery conditions sweep across the UK, says weather presenter Kirsty McCabe.

Washington, D.C. could see its first snowflakes of the season on Friday, while regions north and west of the city could see heavy accumulations from a storm system that is moving across the region.

Northern California is being slammed by an intense atmospheric river which is bringing extreme amounts of rain and snow to the area, as well as southern Oregon.