{"id":628255,"date":"2025-12-29T19:21:11","date_gmt":"2025-12-29T19:21:11","guid":{"rendered":"https:\/\/www.europesays.com\/fr\/628255\/"},"modified":"2025-12-29T19:21:11","modified_gmt":"2025-12-29T19:21:11","slug":"comment-expliquer-ce-phenomene-etrange","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/fr\/628255\/","title":{"rendered":"comment expliquer ce ph\u00e9nom\u00e8ne \u00e9trange ?"},"content":{"rendered":"

Dans la soir\u00e9e du dimanche 28\u00a0d\u00e9cembre, la station M\u00e9t\u00e9o-France de Grenoble – Le Versoud a relev\u00e9 une temp\u00e9rature de moins 5\u00a0\u00b0C, tandis qu\u2019au m\u00eame moment, le thermom\u00e8tre de celle situ\u00e9e \u00e0 Chamrousse a indiqu\u00e9 plus de 6\u00a0\u00b0C. Elle est pourtant install\u00e9e au c\u0153ur d\u2019une station de ski<\/a> , \u00e0 plus de 1\u00a0700 m\u00e8tres d\u2019altitude. Cette temp\u00e9rature plus basse en vall\u00e9e peut para\u00eetre \u00e9trange. Mais c\u2019est en r\u00e9alit\u00e9, un ph\u00e9nom\u00e8ne \u00ab\u00a0tout \u00e0 fait normal\u00a0\u00bb<\/a> , informe Gilles Brunot, m\u00e9t\u00e9orologue de M\u00e9t\u00e9o-France, \u00e0 Chamonix (Haute-Savoie).<\/p>\n

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Il a d\u2019ailleurs aussi pu \u00eatre relev\u00e9 dans les autres massifs, selon des donn\u00e9es de l\u2019association Romma (R\u00e9seau d\u2019observation m\u00e9t\u00e9o du service alpin)<\/a> \u00a0: moins 3\u00a0\u00b0C \u00e0 Saint-Marcellin, contre plus de 5\u00a0\u00b0C \u00e0 Malleval-en-Vercors ou encore moins 6,5\u00a0\u00b0C au Bourg-d\u2019Oisans, contre 7\u00a0\u00b0C \u00e0 Villard-Reymond.<\/p>\n

Ce ph\u00e9nom\u00e8ne porte un nom\u00a0: l\u2019inversion de temp\u00e9rature. \u00ab\u00a0Il est surtout visible en hiver, pendant les p\u00e9riodes anticycloniques, explique le sp\u00e9cialiste. Lorsque le ciel est d\u00e9gag\u00e9 la nuit, l\u2019air au niveau du sol se refroidit car il perd de l\u2019\u00e9nergie. Or, l\u2019air froid est plus lourd que l\u2019air chaud.\u00a0\u00bb Celui-ci reste ainsi en altitude, expliquant les diff\u00e9rences de temp\u00e9ratures.<\/p>\n

Parfois, un \u00e9cart important peut s\u2019observer \u00e0 une diff\u00e9rence d\u2019altitude minime. \u00ab\u00a0J\u2019ai d\u00e9j\u00e0 aper\u00e7u 15\u00a0\u00b0C d\u2019\u00e9cart entre deux points, s\u00e9par\u00e9s par seulement 30 m\u00e8tres de d\u00e9nivel\u00e9\u00a0\u00bb, assure Gilles Brunot.<\/p>\n

L\u2019inversion de temp\u00e9rature ne devrait pas se prolonger au-del\u00e0 de quelques jours.<\/p>\n","protected":false},"excerpt":{"rendered":"Dans la soir\u00e9e du dimanche 28\u00a0d\u00e9cembre, la station M\u00e9t\u00e9o-France de Grenoble – Le Versoud a relev\u00e9 une temp\u00e9rature…\n","protected":false},"author":2,"featured_media":628256,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9566],"tags":[1111,11,2430,112,113,114,436,1777,674,1011,27,2731,108,73763,12203,73762,8423,12,25,73764],"class_list":{"0":"post-628255","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-grenoble","8":"tag-actu","9":"tag-actualites","10":"tag-auvergne-rhone-alpes","11":"tag-edition-grenoble-agglomeration","12":"tag-edition-gresivaudan-oisans","13":"tag-edition-voiron-saint-marcellin","14":"tag-environnement","15":"tag-eu","16":"tag-europe","17":"tag-fr","18":"tag-france","19":"tag-grenoble","20":"tag-isere","21":"tag-le-bourg-doisans","22":"tag-le-versoud","23":"tag-malleval-en-vercors","24":"tag-meteorologie-climat","25":"tag-news","26":"tag-republique-francaise","27":"tag-villard-reymond"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@fr\/115804483355764299","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/posts\/628255","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/comments?post=628255"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/posts\/628255\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/media\/628256"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/media?parent=628255"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/categories?post=628255"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/fr\/wp-json\/wp\/v2\/tags?post=628255"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}