![]() The rotation tracks or hail swath data can be overlaid on high-resolution street maps in Google Earth/Maps to pinpoint areas affected by the hazardous weather. On-Demand uses data gathered and sorted by WDSS-II to estimate the tracks of rotating storms and where hail fell. WDSS-II then processes, analyzes and displays the data in a way that is useful to people who need to diagnose severe weather quickly. The WDSS-II system receives data in real-time from the nationwide networks of weather radars, satellites, surface observations and lightning detectors. The platform is being used by several local American Red Cross chapters, emergency managers and National Weather Service Forecast Offices for disaster assessment and response. On-Demand is a web-based tool that can be used to help confirm when and where severe weather occurred. The image was produced by the On-Demand Severe Weather Verification System, part of NSSL's Warning Decision Support System – Integrated Information (WDSS-II) Multi-Radar/Multi Sensor platform. Bright reds and yellows show more intense circulations. NSSL has released this image documenting the rotation tracks of the devastating tornadoes on May 22.
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