近日，安徽多地出现了一种较为罕见的天气现象——下霰（xiàn）。不少居民在清晨或傍晚发现地面覆盖着一层白色小颗粒，误以为是初雪，实则为‘霰’。霰是一种固态降水，由过冷水滴在高空迅速冻结形成的小冰粒，通常呈白色、不透明、松脆易碎，直径多在2–5毫米之间。与冰雹不同，霰一般出现在降雪前或伴随降雪发生，持续时间较短，落地即碎，不会堆积成厚层。气象专家指出，此次安徽出现霰，主要受冷空气南下与暖湿气流交汇影响，导致大气层中水汽迅速凝结并冻结。这种天气虽不常见，但在冬季寒潮过程中偶有发生。公众无需过度担忧，但需注意道路湿滑带来的出行安全隐患。此外，霰的出现也常被视为强冷空气来临的前兆，提醒人们及时增添衣物、防范降温。值得一提的是，由于霰与雪、冰雹在外形上相似，容易混淆。简单区分方法是：雪柔软蓬松，冰雹坚硬透明且体积较大，而霰则介于两者之间，触感如细小冰珠，落地有轻微弹跳声。此次天气现象不仅为市民带来新奇体验，也提醒我们关注气候变化下的极端天气频发趋势。
Recently, a relatively rare weather phenomenon—graupel—has been observed in multiple areas of Anhui Province. Many residents noticed a layer of small white granules on the ground during early mornings or evenings, initially mistaking it for the season’s first snowfall. However, it was actually graupel. Graupel is a form of solid precipitation formed when supercooled water droplets freeze rapidly onto falling snowflakes or ice nuclei in the atmosphere. It typically appears as white, opaque, and fragile pellets with diameters ranging from 2 to 5 millimeters. Unlike hail, graupel usually occurs just before or alongside snowfall, lasts only briefly, and shatters upon impact without accumulating into thick layers.Meteorologists explain that this occurrence in Anhui resulted from the collision of a southward-moving cold air mass with warm, moist air, causing rapid condensation and freezing of atmospheric moisture. While uncommon, such events can occasionally happen during winter cold surges. The public need not be overly concerned, but should remain cautious of slippery roads and potential travel hazards. Additionally, graupel often signals the imminent arrival of a strong cold front, serving as a reminder to dress warmly and prepare for sudden temperature drops.It’s worth noting that graupel is often confused with snow or hail due to visual similarities. A simple way to distinguish them: snow is soft and fluffy; hail is hard, transparent, and larger; while graupel feels like tiny icy beads and produces a faint bouncing sound when hitting the ground. This unusual weather event not only offered locals a novel experience but also highlighted the increasing frequency of extreme weather under changing climate conditions.
原创文章，作者：admin，如若转载，请注明出处：https://ktez.cn/17273.html