近日，加拿大安大略省多伦多市遭遇极端寒潮，体感温度一度接近零下33℃，引发广泛关注。需要明确的是，‘体感温度’并非实际气温，而是综合考虑风速、湿度等环境因素后，人体实际感受到的冷热程度。在强风和低温共同作用下，热量从皮肤迅速流失，使人感觉比气象站测得的实际气温更冷。据加拿大环境部数据，多伦多当时的实际气温约为零下15℃至零下20℃，但由于风速高达每小时50公里以上，风寒效应显著增强，导致体感温度骤降至接近零下33℃。这种极端体感温度对健康构成严重威胁，尤其是暴露在外的皮肤可能在10至15分钟内出现冻伤风险。当地政府已发布极寒天气警报，建议居民尽量减少外出，穿戴多层保暖衣物，特别注意保护面部、手指和脚趾等易受冻部位。同时，户外水管、车辆及宠物也需采取防冻措施。专家提醒，即使短时间外出，也应做好充分防护，避免因低温引发失温或冻伤等健康问题。此次寒潮是北美冬季典型天气现象之一，气候变化背景下，极端天气事件频发，公众需提高防范意识，科学应对严寒。
Recently, Toronto, Ontario, Canada experienced an extreme cold snap, with wind chill values plunging to nearly -33°C, drawing widespread attention. It’s important to clarify that ‘wind chill’ or ‘feels-like temperature’ is not the actual air temperature but a measure of how cold it feels on human skin when wind speed and other environmental factors are taken into account. Strong winds accelerate heat loss from the body, making it feel significantly colder than the thermometer reading.According to Environment and Climate Change Canada, the actual air temperature in Toronto ranged between approximately -15°C and -20°C. However, with wind speeds exceeding 50 km/h, the wind chill effect dramatically intensified, driving the perceived temperature down to nearly -33°C. At such extremes, exposed skin can develop frostbite in as little as 10 to 15 minutes.Local authorities have issued extreme cold warnings, urging residents to limit outdoor activities, wear multiple layers of warm clothing, and pay special attention to protecting vulnerable areas like the face, fingers, and toes. Precautions are also advised for outdoor pipes, vehicles, and pets to prevent freezing damage. Experts emphasize that even brief exposure requires adequate protection to avoid hypothermia or frostbite.This cold wave is a typical winter weather event in North America. As climate change increases the frequency of extreme weather, public awareness and preparedness for severe cold are more critical than ever.
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