Hailstorms in the U.S.

Hailstorms in the U.S. This feature layer, utilizing data from the National Oceanic and Atmospheric Administration (NOAA), displays hailstorms in the United States between 1955 and 2024. Per NOAA, "Hail is a form of precipitation consisting of solid ice that forms inside thunderstorm updrafts. Hail can damage aircraft, homes and cars, and can be deadly to livestock and people. Hailstones are formed when raindrops are carried upward by thunderstorm updrafts into extremely cold areas of the atmosphere and freeze. Hailstones then grow by colliding with liquid water drops that freeze onto the hailstone’s surface. Hail falls when it becomes heavy enough to overcome the strength of the thunderstorm updraft and is pulled toward the earth by gravity." A quarter-sized hailstorm outside Oklahoma City Data currency: December 30, 2024 Data source: Storm Prediction Center Data modifications: Added fields Calculated Month and Date For more information: Severe Weather 101 - Hail; NSSL Research: Hail Support documentation: SPC Tornado, Hail, and Wind Database Format Specification For feedback, please contact: [e-mail] National Oceanic and Atmospheric Administration Per NOAA, its mission is "To understand and predict changes in climate, weather, ocean, and coasts, to share that knowledge and information with others, and to conserve and manage coastal and marine ecosystems and resources."

美国境内冰雹数据集
本特征图层采用美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）的数据，展示了1955年至2024年间美国境内的冰雹事件。

据NOAA介绍："冰雹是一种固态降水形态，形成于雷暴上升气流内部。冰雹可能对飞机、房屋与车辆造成损毁，甚至会对牲畜和人类构成致命威胁。冰雹的形成过程为：雨滴被雷暴上升气流抬升至大气层极寒区域并发生冻结；此后，冰雹通过与液态水滴碰撞，使水滴在其表面冻结而不断增大；当冰雹重量足以克服雷暴上升气流的托举力时，便会在重力作用下坠落至地面。"

俄克拉荷马城郊外曾出现直径相当于25美分硬币的冰雹。

数据更新至2024年12月30日。
数据来源：风暴预测中心（Storm Prediction Center）
数据修改内容：新增"月份"与"日期"计算字段。

更多参考资料：《极端天气101——冰雹》；美国国家强风暴实验室（National Severe Storms Laboratory, NSSL）冰雹研究相关内容。

支持文档：《风暴预测中心龙卷风、冰雹与风场数据库格式规范》

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美国国家海洋和大气管理局的使命为："了解并预测气候、天气、海洋与海岸带的变化，向公众分享相关知识与信息，同时保护并管理海岸与海洋生态系统及资源。"