{"id":5852,"date":"2025-11-06T00:25:46","date_gmt":"2025-11-05T23:25:46","guid":{"rendered":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/on-5-novembre-2025-at-23h25-savez-vous-comment-sont-realisees-les-previsions-meteo\/"},"modified":"2025-11-06T00:25:46","modified_gmt":"2025-11-05T23:25:46","slug":"on-5-novembre-2025-at-23h25-savez-vous-comment-sont-realisees-les-previsions-meteo","status":"publish","type":"post","link":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/on-5-novembre-2025-at-23h25-savez-vous-comment-sont-realisees-les-previsions-meteo\/","title":{"rendered":"on 5 novembre 2025 at 23h25  Savez-vous comment sont r\u00e9alis\u00e9es les pr\u00e9visions m\u00e9t\u00e9o ?"},"content":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader <a href=\"https:\/\/www.meteo-paris.com\/actualites\/savez-vous-comment-sont-realisees-les-previsions-meteo\" target=\"_blank\" class=\"feedzy-rss-link-icon\">Read More<\/a><\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/test-sylvain\/prevision-meteo-comment-ca-marche.png\" \/><\/p>\n<p>Faire une pr\u00e9vision m\u00e9t\u00e9o est plus complexe qu&#8217;on ne le pense. M\u00eame de nos jours, l&#8217;analyse humaine reste primordiale pour corriger et r\u00e9duire au maximum les erreurs que laissent passer les mod\u00e8les et les pr\u00e9visions automatiques. On vous explique tout.<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<h2>Comment sont r\u00e9alis\u00e9es les pr\u00e9visions m\u00e9t\u00e9o ?<\/h2>\n<p>\u00a0<\/p>\n<p>Avant de pouvoir faire de la pr\u00e9vision, il faut d&#8217;abord r\u00e9colter un maximum d&#8217;observations du temps \u00e0 la surface du globe. Celles-ci sont recueillies par les nombreuses stations implant\u00e9es sur terre, par les bou\u00e9es m\u00e9t\u00e9o en mer mais aussi par les images satellite et les images radar, donnant tout un tas d&#8217;informations en temps r\u00e9el sur les temp\u00e9ratures, la pression, la vitesse du vent, la couverture nuageuse ou encore les pr\u00e9cipitations.\u00a0Une fois ces donn\u00e9es collect\u00e9es, elles sont centralis\u00e9es et inject\u00e9es dans les mod\u00e8les de pr\u00e9vision &#8211; des sortes d&#8217;immenses ordinateurs (appel\u00e9s super-calculateurs) qui vont pouvoir simuler l&#8217;atmosph\u00e8re des heures et jours \u00e0 venir en fonction des observations des derni\u00e8res heures et jours.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/_next\/image?url=https%3A%2F%2Fs.meteo-villes.com%2Fuploads%2Fschema-prevision.jpg&amp;w=1200&amp;q=75\" \/><\/p>\n<p><em><strong>Sch\u00e9ma des diff\u00e9rentes \u00e9tapes de la pr\u00e9vision m\u00e9t\u00e9o<\/strong><\/em>\u00a0&#8211; M\u00e9t\u00e9o France<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>Plusieurs fois par jour, les mod\u00e8les de pr\u00e9visions sont r\u00e9actualis\u00e9s et proposent leurs sc\u00e9narios pour les heures et jours \u00e0 venir. C&#8217;est \u00e0 ce moment que le pr\u00e9visionniste entre en jeu. En effet, il existe plusieurs mod\u00e8les de pr\u00e9visions proposant diff\u00e9rents sc\u00e9narios. Le pr\u00e9visionniste devra ainsi d\u00e9terminer quel sc\u00e9nario il faut suivre afin de r\u00e9aliser puis diffuser ses pr\u00e9visions sous forme de cartes, tableaux ou bulletins textuels. C&#8217;est l\u00e0 o\u00f9 se trouve la diff\u00e9rence majeure avec la pr\u00e9vision automatique. Le pr\u00e9visionniste peut se servir de son exp\u00e9rience pour privil\u00e9gier le mod\u00e8le le plus fiable ou, \u00e0 court terme, constater l&#8217;\u00e9cart entre pr\u00e9vision et r\u00e9alit\u00e9 afin de corriger la pr\u00e9vision <strong>en maximisant sa fiabilit\u00e9<\/strong>. Il y a aussi un r\u00f4le p\u00e9dagogique avec des explications sur le temps qu&#8217;il fait, comme dans <a href=\"https:\/\/www.meteo-villes.com\/france\/previsions\">nos bulletins &gt;&gt;&gt;<\/a><\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/_next\/image?url=https%3A%2F%2Fs.meteo-villes.com%2Fuploads%2Fprevisionniste-schema.jpg&amp;w=1920&amp;q=75\" \/><\/p>\n<p><em><strong>Sch\u00e9ma du r\u00f4le du pr\u00e9visionniste dans la r\u00e9alisation d&#8217;un bulletin m\u00e9t\u00e9o<\/strong><\/em>\u00a0&#8211; M\u00e9t\u00e9o France<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<h2>Pourquoi les pr\u00e9visions peuvent-elles changer d&#8217;un jour \u00e0 l&#8217;autre ?<\/h2>\n<p>\u00a0<\/p>\n<p>Parfois, la circulation atmosph\u00e9rique est bien d\u00e9finie avec un anticyclone sur les A\u00e7ores et des basses pressions sur le nord de l&#8217;Europe. En revanche, il existe des situations o\u00f9 tout est bien plus chaotique, comme en ce moment. Comme on le voit sur la carte ci-dessous, les zones de hautes et de basses pressions sont de faible dimension et tr\u00e8s volatiles, ce qui rend la pr\u00e9vision \u00e0 plusieurs jours particuli\u00e8rement d\u00e9licate. En effet, il suffit d&#8217;un d\u00e9calage de quelques centaines de kilom\u00e8tres d&#8217;un de ses centres d&#8217;action &#8211; ce qui n&#8217;est rien \u00e0 4 ou 5 jours d&#8217;\u00e9ch\u00e9ance &#8211; pour totalement modifier la pr\u00e9vision de votre r\u00e9gion.<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/test-sylvain\/pression-9novembre.png\" \/><\/p>\n<p><em><strong>Pression pr\u00e9vue pour le dimanche 9 novembre 2025<\/strong><\/em> &#8211; tropicaltidbits.com<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>C&#8217;est pourquoi nous indiquons clairement les incertitudes <a href=\"https:\/\/www.meteo-paris.com\/ile-de-france\/previsions\">dans nos tableaux de pr\u00e9vision<\/a>. Elles sont mat\u00e9rialis\u00e9es par de petits pictogrammes \u00e0 la gauche des tableaux. Un rond orange signifie que le sc\u00e9nario reste \u00e0 confirmer avec une incertitude mod\u00e9r\u00e9e. Si les sc\u00e9narios divergent fortement et que les incertitudes sont grandes, un carr\u00e9 rouge appara\u00eet, t\u00e9moignant d&#8217;une pr\u00e9vision tr\u00e8s incertaine. Cette notion de transparence est essentielle car la m\u00e9t\u00e9o n&#8217;est pas une science exacte. Les pr\u00e9visions automatiques ne permettent pas d&#8217;\u00e9voquer cette incertitude et peuvent changer du tout au tout sans explications.<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/test-sylvain\/fiabilite-meteo-2.png\" \/><\/p>\n<p><em><strong>Indicateur de fiabilit\u00e9 dans nos tableaux de pr\u00e9visions<\/strong><\/em> &#8211; M\u00e9t\u00e9o Paris<\/p>\n<p>\u00a0<\/p>\n<p>Enfin, il est important de pr\u00e9ciser que nos pr\u00e9visionnistes r\u00e9alisent un suivi permanent tous les jours de la semaine. Cet atout majeur nous permet de corriger et de r\u00e9ajuster en permanence les pr\u00e9visions pour qu&#8217;elles soient les plus proches de la r\u00e9alit\u00e9.<\/p>\n<p>\u00a0<\/p>\n<p><em>Auteur : Alexandre Slowik<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader Read More Faire une pr\u00e9vision m\u00e9t\u00e9o est plus complexe qu&#8217;on ne le pense. M\u00eame de nos jours, l&#8217;analyse humaine reste primordiale [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5853,"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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[6],"tags":[],"class_list":["post-5852","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-externes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>on 5 novembre 2025 at 23h25 Savez-vous comment sont r\u00e9alis\u00e9es les pr\u00e9visions m\u00e9t\u00e9o ? - Meteo Sain-Bel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/meteo-sain-bel.fr\/wp\/blog\/on-5-novembre-2025-at-23h25-savez-vous-comment-sont-realisees-les-previsions-meteo\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"on 5 novembre 2025 at 23h25 Savez-vous comment sont r\u00e9alis\u00e9es les pr\u00e9visions m\u00e9t\u00e9o ? - Meteo Sain-Bel\" \/>\n<meta property=\"og:description\" content=\"M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader Read More Faire une pr\u00e9vision m\u00e9t\u00e9o est plus complexe qu&#8217;on ne le pense. 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