The Yukon is currently battling an intense cold snap, with temperatures plunging to -50°C in some areas. But what's causing this extreme weather? And why is it affecting the power grid? Here's a breakdown of the situation and what's behind the frigid temperatures.
The Arctic Ridge of High Pressure
The culprit is an Arctic ridge of high pressure, according to Environment Canada meteorologist Tanmay Rane. When a cold front passes, the cold air behind it follows, and since cold air is heavier, it sinks to the surface, pushing surrounding air out of the way. This creates a pocket of air that's colder than the surface air, leading to cooler conditions.
Clear skies are also a factor. Without clouds to absorb heat radiated from the Earth's surface, the heat escapes into space overnight, preventing temperatures from rising. This creates a vicious cycle, with the Yukon getting colder and colder each night.
Wind Chill and Frostbite Risk
Wind chill is another factor to consider. Windier conditions make you feel colder, and wind chill values can be significantly lower than recorded temperatures. Exposure to wind chill values between -48°C and -54°C poses a severe risk of frostbite, with skin freezing in less than five minutes at wind speeds above 50 km/h.
Power Grid Strain
The extreme cold is putting a strain on Yukon's power grid. Electricity usage has surged, reaching a peak on Monday with 123 megawatts of power being pulled from a system that can accommodate 140 megawatts. Rolling blackouts may be enacted to alleviate demand, but residents are being urged to prepare emergency kits with supplies like flashlights, emergency blankets, and food.
When Will the Cold Let Up?
While the cold isn't going away anytime soon, Rane predicts that temperatures could start to rise by next week. The Arctic high will slowly move south into northern BC, and clouds will begin to move in, leading to a gradual increase in temperature.
Conclusion
The extreme cold in the Yukon is a complex weather phenomenon, driven by high pressure, clear skies, wind chill, and power grid strain. While it's a challenging situation, residents are taking precautions, and the cold is expected to ease in the coming days.
