The spring melt has everyone scrambling to protect the city from flooding, and the fire department responds to a call that puts the town in jeopardy.

Avalanche technicians race to repair a remote weather station before an incoming storm. The escalating risks force them to flush out a dangerous buildup of snow.

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services. Working alone, Ray faces a string of dangerous solo vehicle-retrieval missions on a storm-battered highway.

Multiple 911 calls push Dawson City to the brink as first responders battle to save a family home and a historic building, while snowstorms pummel Whitehorse, causing chaos and forcing a dangerous backcountry helicopter rescue mission.

Frigid temperatures wreak havoc on Dawson City, putting the fire department in danger. An avalanche shuts down the Klondike Highway.