Extreme cold, high winds and snow leave much of Canada under weather warnings

Winter storm tracker: Almost every US state under a weather alert - ABC News

Here is the latest on the winter storm wreaking havoc across the country

Snow and storms across US as 55 reported killed in winter weather, US weather

Live updates: Winter storm and severe cold sweeps across US

Photos: Deadly blizzard rages in US, Canada on Christmas, Weather News

Winter storm live updates: Millions enduring an arctic Christmas

Criteria for public weather alerts

Extreme cold warnings blanket Western Canada as winter officially arrives – Winnipeg Free Press

Expect extreme cold to end as Pacific warmth breezes into Alberta

Winter storm causes havoc across Canada, disrupts holiday travel

Feet of lake-effect snow to blanket Great Lakes as Midwest winter storm winds down

Winter travel warnings: heavy snow threatens to cancel flights, close roads : NPR

A 'once in a generation' winter storm will impact nearly every state and cripple Christmas travel

Expect extreme cold to end as Pacific warmth breezes into Alberta

Western Labrador under extreme cold warning