{"id":2798,"date":"2025-03-31T13:24:29","date_gmt":"2025-03-31T11:24:29","guid":{"rendered":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/on-31-mars-2025-at-11h24-un-conflit-de-masse-dair-exceptionnel-sur-les-etats-unis\/"},"modified":"2025-03-31T13:24:29","modified_gmt":"2025-03-31T11:24:29","slug":"on-31-mars-2025-at-11h24-un-conflit-de-masse-dair-exceptionnel-sur-les-etats-unis","status":"publish","type":"post","link":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/on-31-mars-2025-at-11h24-un-conflit-de-masse-dair-exceptionnel-sur-les-etats-unis\/","title":{"rendered":"on 31 mars 2025 at 11h24  Un conflit de masse d&#8217;air exceptionnel sur les \u00c9tats-Unis\u00a0!"},"content":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader <a href=\"https:\/\/www.meteo-paris.com\/actualites\/un-conflit-de-masse-d-air-exceptionnel-sur-les-etats-unis\" target=\"_blank\" class=\"feedzy-rss-link-icon\">Read More<\/a><\/p>\n<h2>Quand deux masses d&#8217;air oppos\u00e9es se rencontrent<\/h2>\n<p>Le Nord de l&#8217;Am\u00e9rique est relativement habitu\u00e9 aux extr\u00eames m\u00e9t\u00e9orologiques, notamment au niveau des temp\u00e9ratures avec des masses d&#8217;air tropicales remontant du Golfe du Mexique et pouvant rencontrer des masses d&#8217;air polaires venues du Nord du Canada.<\/p>\n<p>C&#8217;est ce qu&#8217;il s&#8217;est pass\u00e9 en fin de semaine derni\u00e8re entre le Nord des \u00c9tats-Unis et le Canada avec une masse d&#8217;air polaire descendant de l&#8217;Arctique et envahissant une large partie du Canada et du Nord des \u00c9tats-Unis rencontrant une masse d&#8217;air subtropicale remontant du Mexique.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/conflit%2029%20mars.png\" \/><\/p>\n<p><em><strong>Anomalies de temp\u00e9ratures sur les \u00c9tats-Unis pour la journ\u00e9e du 29 mars 2025 \u2013<\/strong><\/em> via TropicalTidBits<\/p>\n<p>\u00a0<\/p>\n<p>C&#8217;est notamment en journ\u00e9e du samedi 29 mars sur le Nord-Est des \u00c9tats-Unis que ce conflit de masse d&#8217;air fut le plus remarquable. En effet, on pouvait par exemple relever jusqu&#8217;\u00e0 29\u00b0C \u00e0 New-York au meilleur de la journ\u00e9e alors qu&#8217;on n&#8217;observait pas plus de 2\u00b0C du c\u00f4t\u00e9 de Boston o\u00f9 quelques flocons ont m\u00eame \u00e9t\u00e9 observ\u00e9s, soit une diff\u00e9rence de 27\u00b0C\u00a0en \u00e0 peine 300km\u00a0!<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/GnOnthuXQAAMmY_.jpg\" \/><\/p>\n<p><em><strong>Impressionnant gradient thermique sur le Nord-Est des Etats-Unis en journ\u00e9e du 29 mars 2025<\/strong><\/em> \u2013 M\u00e9t\u00e9o-Villes<\/p>\n<p>\u00a0<\/p>\n<p>Sur l&#8217;\u00eele de Long Island, situ\u00e9e au c\u0153ur de ce conflit de masse d&#8217;air durant la journ\u00e9e, la diff\u00e9rence de temp\u00e9rature fut encore plus impressionnante. \u00c0 17h locales, on pouvait en effet relever 27,2\u00b0C \u00e0 l&#8217;a\u00e9roport international Kennedy contre 10\u00b0C \u00e0 la m\u00eame heure \u00e0 Shirley, soit une diff\u00e9rence de 17,2\u00b0C en \u00e0 peine 80 kilom\u00e8tres\u00a0!<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/conflit%20Lisland.png\" \/><\/p>\n<p><em><strong>Exceptionnel gradient thermique sur Long Island le 29 mars 2025<\/strong><\/em> \u2013 via Infoclimat.fr<\/p>\n<p>\u00a0<\/p>\n<h2>Un conflit qui ne fut pas sans cons\u00e9quence<\/h2>\n<p>Comme souvent dans ce genre de situation, ce conflit de masses d&#8217;air fut accompagn\u00e9 de ph\u00e9nom\u00e8nes m\u00e9t\u00e9orologiques virulents entre Canada et \u00c9tats-Unis.<\/p>\n<p>Sur le Sud de ce conflit, une violente d\u00e9gradation orageuse a \u00e9t\u00e9 observ\u00e9e ce dimanche sur une large zone s&#8217;\u00e9tendant du Texas au Michigan avec de violentes pr\u00e9cipitations, des chutes de gr\u00eale parfois dommageables, de puissantes rafales de vent ainsi que plusieurs tornades.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/GnVGBk5XoAA84PA.jpg\" \/><\/p>\n<p><em><strong>Tornade pr\u00e8s de Harrisburg en Arkansas ce 30 mars 2025 <\/strong><\/em>\u2013 Photographie\u00a0: <a href=\"https:\/\/x.com\/BradArnoldWX\/status\/1906507022616469851\">Brad Arnold<\/a>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>Plus au Nord, au niveau de la zone de conflit \u00e0 la fronti\u00e8re entre USA et Canada, un impressionnant \u00e9pisode de pluies vergla\u00e7antes a \u00e9t\u00e9 observ\u00e9 durant le week-end, notamment entre Michigan et Ontario.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/GnSywRTWAAANvQs.jpg\" \/><\/p>\n<p><em><strong>Impressionnante couche de glace suite \u00e0 des pluies vergla\u00e7antes \u00e0 Gaylord dans le Michigan ce 30 mars 2025 <\/strong><\/em>\u2013 Via Twitter @ironpigsmoke<\/p>\n<p>\u00a0<\/p>\n<p>Sur les secteurs les plus touch\u00e9s, les d\u00e9g\u00e2ts sont parfois tr\u00e8s importants avec de nombreuses chutes d&#8217;arbres et plusieurs milliers de foyers encore priv\u00e9s d&#8217;\u00e9lectricit\u00e9 en ce d\u00e9but de semaine.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/GnU_QgxWoAAJti8.jpg\" \/><\/p>\n<p><em><strong>Nombreux d\u00e9g\u00e2ts suite aux pluies vergla\u00e7antes \u00e0 Orillia en Ontario ce 30 mars 2025 <\/strong><\/em>\u2013 Via Twitter @tbryce<\/p>\n<p>\u00a0<\/p>\n<p>De nouveaux conflits de masse d&#8217;air notables sont attendus dans les prochains jours du c\u00f4t\u00e9 des \u00c9tats-Unis, engendrant notamment plusieurs d\u00e9gradations orageuses virulentes avec un risque accru de tornades sur une large partie Centre et Est du pays, une situation qu&#8217;il conviendra de suivre attentivement sur ces r\u00e9gions.\u00a0<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/twitter-guillaume-sechet.jpg\" \/><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/logotb.jpg\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader Read More Quand deux masses d&#8217;air oppos\u00e9es se rencontrent Le Nord de l&#8217;Am\u00e9rique est relativement habitu\u00e9 aux extr\u00eames m\u00e9t\u00e9orologiques, notamment au [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2799,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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