This storm just froze half of North America

• 1 hour ago
• News
• Duration 3:01

A massive winter storm has buried millions under a historic blanket of snow and ice, locking much of North America in a dangerous Arctic air mass. CBC’s Johanna Wagstaffe breaks down the rare atmospheric collision of a polar vortex and an atmospheric river — two extreme weather phenomena that combined to create this record-breaking, high-impact event.