In February 2024, Shanghai witnessed the rare meteorological phenomenon known as ‘thundersnow,’ drawing widespread public attention. Thundersnow occurs when snowfall coincides with thunder and lightning—a highly unusual event, especially in southern China. Typically, snow forms under stable, cold conditions, while thunderstorms require strong upward motion of warm, moist air to generate convective clouds. The simultaneous occurrence of both indicates an extremely unstable atmosphere with intense clashes between cold and warm air masses.Meteorologists explained that this thundersnow event resulted from a powerful cold front surging southward and colliding violently with warm, moist air over the middle and lower reaches of the Yangtze River. This created a unique atmospheric structure—warm and humid near the surface, yet dry and cold aloft—enabling both snow and thunderstorms to coexist. While visually spectacular, such weather poses hazards including icy roads, reduced visibility, and lightning risks.Historical records show that Shanghai has seldom experienced thundersnow, with the last similar occurrence dating back several decades. Though a natural marvel, this event also underscores the increasing frequency of extreme weather linked to climate change. Authorities advise residents to enjoy the spectacle cautiously, stay indoors during thunderstorms, and take precautions against cold and slippery conditions.
2024年2月，上海罕见出现‘雷打雪’天气现象，引发市民广泛关注。‘雷打雪’是指在降雪过程中伴随雷电活动的特殊气象现象，在我国南方地区尤为少见。通常，降雪多发生在稳定、寒冷的冷空气控制下，而雷电则需要暖湿空气强烈上升形成对流云团。两者同时出现，说明大气层结极不稳定，冷暖空气剧烈交汇。气象专家解释，此次‘雷打雪’是由于强冷空气南下与南方暖湿气流在长江中下游地区激烈对峙所致。低空暖湿、高空干冷的特殊结构为雷暴和降雪共存创造了条件。这种天气不仅视觉震撼，也带来一定安全隐患，如道路结冰、能见度降低及雷击风险。历史上，上海极少记录到此类现象，上一次类似事件可追溯至数十年前。‘雷打雪’虽属自然奇观，但也提醒公众关注极端天气频发背后的气候变化趋势。气象部门建议市民在欣赏奇景的同时，注意防寒防滑，并避免在雷暴期间外出。
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