National weather service digital atmosphere
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"This work illustrates the importance of evaluating how people interpret information about risks, particularly when it's a matter of public safety," Demuth said. The agency is now previewing the new graphical approach on its website as it prepares to launch the new version across the nation next month. The research team summarized its findings in a 2013 paper in Weather and Forecasting, an American Meteorological Society journal.īuilding on this work, the NWS further refined the icons and began to test them last year, asking for input from thousands of users.
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For example, more than 97 percent of survey respondents correctly identified the start and end time of the flood watch with the revamped graphics and text, compared to less than 4 percent in a control group using the existing NWS presentation.
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The surveys showed that users were significantly better at identifying the timing and nature of the weather threat when the information was presented with new graphics and reinforced with wording that stated the start and stop times of the threat. "Ideally a user will look at it and get a pretty good idea of what is expected."ĭemuth and her colleagues conducted two rounds of surveys with more than 13,000 users of NWS forecasts, asking them to evaluate designs to see which one was best at communicating a severe thunderstorm warning and a flood watch. "This is supposed to be a forecast at a glance, so we adapted the approach using NCAR's work as a basis." Jacks said. They developed experimental graphics and text with the goal of conveying sometimes complex information in a way that is easy to interpret. The research team, working with the NWS, focused on better transmitting two aspects of a forecast that are crucial for helping people understand their risk: the existence of a hazardous weather threat and the timing of that threat. An icon depicting rain, for example, might prompt people to cancel outdoor plans even if there was just a 10 percent chance of showers for a few hours. The work was primarily funded by the NWS, with additional support from NOAA and the National Science Foundation, which sponsors NCAR.ĭemuth and her colleagues began looking into the issue several years ago when the NWS wanted to determine if the icons could communicate weather information more clearly. "Not only must we have advancements in atmospheric science to improve forecasts and services, we must also infuse social science to ensure we are communicating forecast information in a way that is clear and understandable so people can take appropriate action." "Research provides the essential backbone to any effective operational product used by the National Weather Service to protect lives and property," Uccellini said. NWS director Louis Uccellini said the new project demonstrates the importance of research in communicating forecasts to the public. "This helps users interpret the forecast more easily and use it to make informed decisions." "Just putting out the forecast is no longer enough," he said. "The main goal is to better convey information that's critical for protecting lives and protecting property."Įli Jacks, acting chief of the NWS's Forecast Services Division, said the changes are an important step toward helping people make better use of NWS forecasts. "We want to help people better understand when there's a major weather threat and when it's likely to occur," said NCAR's Julie Demuth, a researcher who specializes in communicating weather risks to the public. The team developed prototype graphics and surveyed tens of thousands of local forecast users, finding that specific improvements to the graphics could greatly improve public understanding of the forecasts. The changes are based on several years of work by a multidisciplinary team at NCAR that worked closely with the NWS, an agency within the National Oceanic and Atmospheric Administration. Colored rectangles drawn around the images will also be used to call attention to weather threats, with yellow denoting a watch, orange denoting an advisory, and red denoting a warning. For example, instead of portraying a night as entirely rainy, a split image could show a 30 percent chance of rain in the early part of the evening, followed by partial clearing after midnight. The new icons will feature split images and color-coded boxes to better communicate the existence, timing, and potential severity of upcoming weather threats. These point-and-click forecasts influence weather-related decisions by people across the country, drawing 2 to 4 million unique web views daily. Beginning July 7 the NWS will use the redesigned icons for all local forecasts.