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A research team tested six of the most advanced weather models against a record-breaking flood season. They all missed the storms in the same four ways.<\/p>\n
Sharper than ever before<\/p>\n
Storms that do the worst damage are rarely lone thunderstorms<\/a>. <\/p>\n They gang up into sprawling clusters \u2013 mesoscale convective systems \u2013 that a review<\/a> ties to most of the world\u2019s worst flooding, damaging winds, and record rain.<\/p>\n Older models spread only about 10,000 grid cells across the globe. A storm spanning hundreds of miles fell on a few blocky squares. <\/p>\n To compensate for storms they could not fully resolve, those models relied on simplified rules of thumb, producing too much light rain while missing the most intense downpours.<\/p>\n A new generation, called kilometer-scale models, slices the globe into over 50 million cells \u2013 fine enough to make out features as small as about 1.7 miles. <\/p>\n Xiaotong Huang, a graduate researcher at the Chinese Academy of Meteorological Sciences (CAMS<\/a>), led the team that ran six of these models against the 2020 storms.<\/p>\n Weather models meet a record flood<\/p>\n That exam came in the summer of 2020, when relentless rain swamped East Asia. Ten Chinese provinces flooded. <\/p>\n Parts of Japan saw about 39 inches of rain in three days. South Korea\u2019s rainy season ran 54 days instead of the usual 32 days. <\/p>\n In a worldwide modeling effort in 2025, several of the new weather models were each run for a full year \u2013 enough to cover the whole 2020 wet season.<\/p>\n The models came from leading weather and climate centers in Europe, Asia, and North America \u2013 each with its own design. <\/p>\n Huang\u2019s team checked them against satellite observations<\/a> of the real storms \u2013 where rain fell, how big each system grew, and how long it lasted.<\/p>\n The big picture <\/p>\n Much of the news was reassuring. Across the board, the models placed the rain roughly where it belonged and moved the storms at close to the right speed and duration.<\/p>\n \u201cThese models mostly get the big picture right,\u201d said Huang. They also caught the daily rhythm of these storms \u2013 the regular cycle of when they flare up and fade.<\/p>\n Most models even tracked one of the region\u2019s signature patterns \u2013 storms forming near the Tibetan Plateau and marching eastward across China for hours. <\/p>\n The fact that this new generation of models could reproduce so much of the observed behavior was an encouraging sign for their developers.<\/p>\n Four shared blind spots<\/p>\n Surprises showed up when the team lined up the errors. Every model missed in the same four directions at once \u2013 a pattern no one had confirmed across so many leading models.<\/p>\n Each one conjured too many storm clusters, mostly flimsy systems that fizzled fast. <\/p>\n Real storms lasted longer and stayed organized, while the models produced a larger number of shorter-lived systems.<\/p>\n On top of that, each simulated storm covered too little ground, cramming its rain into a patch smaller than the real one. <\/p>\n Inside that core, the rain fell harder than the satellites ever recorded. <\/p>\n Each weather model had one strength<\/p>\n Despite the shared blind spots, the models were not identical, and each had a strong suit. <\/p>\n The European center\u2019s model drew the most realistic map of where the heaviest rain landed, matching the real geography best.<\/p>\n A Japanese model came closest on storm size, getting each system\u2019s sprawl about right where others shrank it too far. <\/p>\n The strongest U.S. entry best captured a subtler contrast \u2013 how rain differs over land and over open ocean.<\/p>\n No single model won outright. Each got a piece of the puzzle right while carrying the same core weakness \u2013 a hint that the fix lies deep in the way they all build a storm, not in one model\u2019s tweak.<\/p>\n A clear target for better forecasts<\/p>\n The stakes are not hypothetical. In late May 2026, torrential rain hammered the lower Yangtze River basin in eastern China, and authorities issued the year\u2019s first red alert for flash floods<\/a>.<\/p>\n These storm clusters are not staying put, either. An earlier study<\/a> from the same group found their rain has grown more frequent and intense over two decades.<\/p>\n For the first time across so many leading models, the field knows exactly where they fail on the storms that do real harm. <\/p>\n That hands developers a clear target and pushes these year-long simulations toward a tool forecasters and flood planners can rely on.<\/p>\n The study is published in Advances in Atmospheric Sciences<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"It feels safe to assume that a sharper weather model must be a more accurate one. Today\u2019s global…\n","protected":false},"author":2,"featured_media":511327,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[61,60,82],"class_list":["post-511326","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-ie","tag-ireland","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/511326","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/comments?post=511326"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/511326\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media\/511327"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media?parent=511326"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/categories?post=511326"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/tags?post=511326"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}