Tornadoes

Tornadoes This feature layer, utilizing data from the National Oceanic and Atmospheric Administration (NOAA), displays tornadoes in the United States, Puerto Rico and U.S. Virgin Islands between 1950 and 2025. Per NOAA, “A tornado is a narrow, violently rotating column of air that extends from a thunderstorm to the ground. Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. Tornadoes can be among the most violent phenomena of all atmospheric storms we experience. The most destructive tornadoes occur from supercells, which are rotating thunderstorms with a well-defined radar circulation called a mesocyclone. (Supercells can also produce damaging hail, severe non-tornadic winds, frequent lightning, and flash floods.)” EF-5 Tornado (May 22, 2011) near Joplin, Missouri Data currency: 2025 Data source: Storm Prediction Center Data modification: Added field "Date_Calc" For more information: Severe Weather 101 - Tornadoes; NSSL Research: Tornadoes 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.”

龙卷风要素图层
本要素图层依托美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）的数据，展示了1950年至2025年间美国本土、波多黎各及美属维尔京群岛境内的龙卷风分布情况。

根据NOAA官方定义："龙卷风是一种从雷暴延伸至地面的狭窄且剧烈旋转的气柱。由于风本身不可见，除非形成由水滴、尘埃与残骸组成的凝结漏斗，否则难以直接观测到龙卷风。龙卷风可被列为人类所经历的各类大气风暴中最为剧烈的现象之一。极具破坏性的龙卷风多产生于超级单体雷暴——这类旋转雷暴拥有明确的雷达环流特征，即中气旋（mesocyclone）。（超级单体雷暴亦可引发破坏性冰雹、严重的非龙卷大风、频发雷电及山洪。）"

2011年5月22日发生于密苏里州乔普林附近的EF5级龙卷风。

数据时效性：2025年
数据来源：风暴预测中心（Storm Prediction Center）
数据修改说明：新增"Date_Calc"字段

更多参考资料：《极端天气入门101——龙卷风》、美国国家强风暴实验室（National Severe Storms Laboratory, NSSL）相关研究：龙卷风
支持文档：《风暴预测中心龙卷风、冰雹与大风数据库格式规范》

如需反馈相关问题，请联系：[e-mail]

美国国家海洋和大气管理局的官方使命为："理解并预测气候、天气、海洋及海岸的变化趋势，向公众分享相关知识与信息，并保护与管理海岸及海洋生态系统与资源。"