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A look at satellite imagery from Friday evening, which depicted the evolution of a subtropical storm within the broader envelope of a nontropical low.<\/span>\u00a9\u00a0WeatherNerds.org<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\nHow did this surprise storm form?<\/h3>\n On Friday morning, for instance, the National Hurricane Center projected only a 10 percent chance that the antecedent system would form. By evening, those odds grew to 40 percent, then 60 percent overnight.<\/p>\n
What happened was that a pocket of thunderstorms developed at the core of a non-latitude low that was traversing the North Atlantic. Water temperatures were marginal, and probably couldn\u2019t support a fully tropical system.<\/p>\n
At first, that flare-up of shower and thunderstorm activity was unremarkable. But it continued to blossom, eventually cultivating its own self-contained pocket of warm air. That small warm-core system detached from any fronts associated with the midlatitude nontropical low.<\/p>\n
Around the same time late Friday, an instrument mounted aboard a European MetOp satellite estimated gale-force winds exceeding 40 mph \u2014 meeting the criteria for a named storm.<\/p>\n
By Saturday morning, thunderstorm activity had increased to the point that, in tandem with strong winds, it met the definition of a subtropical storm.<\/p>\n
What to know about subtropical storms<\/h3>\n Subtropical storms were a source of meteorological debate as early as the 1950s, because structurally, they weren\u2019t quite tropical or nontropical \u2014 but could have the same impacts as conventional named storms.<\/p>\n
The National Hurricane Center began recognizing them in 1972 but didn\u2019t start naming them until 2002.<\/p>\n
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A look at the Hurricane Center’s forecast for Patty. (NOAA\/NHC)<\/span>\u00a9\u00a0NOAA\/NHC\/NOAA\/NHC<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\nDue to their hybrid nature, subtropical storms can form or maintain strength over water temperatures cooler than the roughly 79 degree threshold needed for a tropical system. That means they can form outside the conventional hurricane season and farther north than hurricanes form.<\/p>\n
Meanwhile, there\u2019s more to track in the Atlantic. A disturbance in the Caribbean has an 80 percent chance of eventual development. It could become a tropical system into early next week, and would be called Rafael.<\/p>\n
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___https:\/\/www.msn.com\/en-us\/weather\/topstories\/a-subtropical-storm-named-patty-has-formed-near-the-azores-drifting-east-toward-spain\/ar-AA1tojqq<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1770","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/stateofthenation.info\/index.php?rest_route=\/wp\/v2\/posts\/1770","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stateofthenation.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stateofthenation.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stateofthenation.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stateofthenation.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1770"}],"version-history":[{"count":0,"href":"https:\/\/stateofthenation.info\/index.php?rest_route=\/wp\/v2\/posts\/1770\/revisions"}],"wp:attachment":[{"href":"https:\/\/stateofthenation.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1770"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stateofthenation.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1770"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stateofthenation.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1770"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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