{"id":8573,"date":"2026-08-02T16:43:55","date_gmt":"2026-08-02T14:43:55","guid":{"rendered":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/le-2-aout-2026-a-14h43-orages-violents-lundi-les-regions-les-plus-exposees-a-la-grele-et-aux-fortes-rafales\/"},"modified":"2026-08-02T16:43:55","modified_gmt":"2026-08-02T14:43:55","slug":"le-2-aout-2026-a-14h43-orages-violents-lundi-les-regions-les-plus-exposees-a-la-grele-et-aux-fortes-rafales","status":"publish","type":"post","link":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/le-2-aout-2026-a-14h43-orages-violents-lundi-les-regions-les-plus-exposees-a-la-grele-et-aux-fortes-rafales\/","title":{"rendered":"le 2 ao\u00fbt 2026 \u00e0 14h43  Orages violents lundi : les r\u00e9gions les plus expos\u00e9es \u00e0 la gr\u00eale et aux fortes rafales"},"content":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader <a href=\"https:\/\/www.meteo-paris.com\/actualites\/vigilance-aux-orages-de-grele-pour-lundi-sur-de-nombreuses-regions\" target=\"_blank\" class=\"feedzy-rss-link-icon\">Lire la Suite<\/a><\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/carte_orages_grele_google_discover_225ko.jpg\" \/><\/p>\n<p><em>Plusieurs vagues d\u2019orages parfois violents remonteront du Sud-Ouest vers le Nord-Est de la France au cours de la journ\u00e9e de lundi.<\/em><\/p>\n<h1>\u00a0<\/h1>\n<h1>Orages supercellulaires lundi : gr\u00ealons g\u00e9ants et rafales \u00e0 120 km\/h menacent plusieurs r\u00e9gions<\/h1>\n<p><strong>Apr\u00e8s une nouvelle pouss\u00e9e de chaleur, une d\u00e9gradation orageuse potentiellement violente traversera une grande partie de la France ce lundi 3 ao\u00fbt. Plusieurs salves remonteront du Sud-Ouest vers le Nord-Est, avec un risque marqu\u00e9 de supercellules, de gr\u00ealons d\u00e9passant localement 5 cm et de rafales pouvant approcher 120 km\/h.<\/strong><\/p>\n<p>\u00a0<\/p>\n<h2>Un conflit de masses d\u2019air particuli\u00e8rement explosif<\/h2>\n<p>Le d\u00f4me de chaleur a tent\u00e9 de s\u2019imposer de nouveau sur la France au cours de ces derni\u00e8res heures, mais cette pouss\u00e9e chaude sera de courte dur\u00e9e. De l\u2019air moins chaud en provenance de l\u2019Atlantique commencera \u00e0 progresser par l\u2019ouest, tandis qu\u2019un thalweg d\u2019altitude \u2014 un creux d\u00e9pressionnaire passager \u2014 abordera le pays.<\/p>\n<p>Cette configuration favorisera la rencontre entre l\u2019air oc\u00e9anique et une masse d\u2019air extr\u00eamement chaude et instable, avec des temp\u00e9ratures d\u00e9passant souvent 33 \u00b0C avant l\u2019arriv\u00e9e des orages sur une grande partie du territoire. Plusieurs vagues orageuses pourront alors se former et circuler rapidement du Sud-Ouest vers le Nord-Est.<\/p>\n<p>Les ph\u00e9nom\u00e8nes les plus forts pourraient \u00eatre accompagn\u00e9s d\u2019une importante activit\u00e9 \u00e9lectrique, de pluies tr\u00e8s intenses, de grosses chutes de gr\u00eale et de violentes rafales descendantes. M\u00e9t\u00e9o-Villes confirme le risque d\u2019orages violents sur une grande partie du pays, avec de fortes chutes de gr\u00eale et des rafales fr\u00e9quemment comprises entre 80 et 100 km\/h.<\/p>\n<p>\u00a0<\/p>\n<h2>Les premiers orages d\u00e8s le matin dans le Sud-Ouest<\/h2>\n<p>\u00a0<\/p>\n<p>La d\u00e9gradation pourrait d\u00e9buter tr\u00e8s t\u00f4t. Les premi\u00e8res cellules orageuses sont attendues d\u00e8s la matin\u00e9e pr\u00e8s de la fa\u00e7ade atlantique, notamment entre le Pays basque, les Landes et la Gironde. Elles gagneront ensuite rapidement l\u2019int\u00e9rieur du Sud-Ouest.<\/p>\n<p>Une salve beaucoup plus organis\u00e9e pourrait se d\u00e9velopper entre 15 h et 17 h de l\u2019Aquitaine au Limousin, en passant par le P\u00e9rigord. Les orages se d\u00e9caleront ensuite vers l\u2019Auvergne, le Centre et la Bourgogne en fin d\u2019apr\u00e8s-midi, puis vers le Grand Est et les r\u00e9gions proches des fronti\u00e8res belge, luxembourgeoise et allemande dans la soir\u00e9e.<\/p>\n<p>Une autre zone orageuse particuli\u00e8rement active pourrait concerner le pi\u00e9mont pyr\u00e9n\u00e9en, l\u2019Occitanie et le sud du Massif central entre la fin d\u2019apr\u00e8s-midi et le d\u00e9but de soir\u00e9e. L\u2019horaire exact pourra n\u00e9anmoins varier de plusieurs heures selon la vitesse de progression des diff\u00e9rentes salves.<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/horaires_orages_lundi_google_discover.jpg\" \/><\/p>\n<p><em>Horaires approximatifs d\u2019arriv\u00e9e des premiers orages lundi, avec un d\u00e9clenchement matinal dans le Sud-Ouest puis une progression vers le Nord-Est jusqu\u2019en soir\u00e9e.<\/em><\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<h2>Un risque important d\u2019orages supercellulaires<\/h2>\n<p>\u00a0<\/p>\n<p>La combinaison entre une \u00e9nergie disponible tr\u00e8s \u00e9lev\u00e9e et un fort cisaillement du vent entre le sol et 6 km d\u2019altitude rendra l\u2019atmosph\u00e8re particuli\u00e8rement favorable aux orages organis\u00e9s. Dans ce type de situation, certaines cellules peuvent acqu\u00e9rir un mouvement de rotation durable et \u00e9voluer en supercellules.<\/p>\n<p>Le risque semble particuli\u00e8rement marqu\u00e9 du nord de l\u2019Occitanie au P\u00e9rigord, puis vers le Limousin, l\u2019Auvergne, la Bourgogne et le Grand Est. Les valeurs de MUCAPE repr\u00e9sent\u00e9es sur la carte atteignent ou d\u00e9passent ponctuellement 2 000 \u00e0 3 000 J\/kg, voire davantage dans le Sud, au sein d\u2019un environnement fortement cisaill\u00e9.<\/p>\n<p>La zone du P\u00e9rigord pourrait se trouver au c\u0153ur de la d\u00e9gradation la plus s\u00e9v\u00e8re. Des supercellules isol\u00e9es ou regroup\u00e9es pourront y produire de tr\u00e8s violentes rafales, de gros gr\u00ealons et une activit\u00e9 \u00e9lectrique intense. Le potentiel existe \u00e9galement plus au nord-est, m\u00eame si l\u2019intensit\u00e9 exacte d\u00e9pendra de l\u2019ensoleillement pr\u00e9alable et de la chronologie des premi\u00e8res cellules.<\/p>\n<p>Une supercellule est un orage dot\u00e9 d\u2019un courant ascendant rotatif et persistant. Cette organisation lui permet g\u00e9n\u00e9ralement de durer plus longtemps qu\u2019un orage ordinaire et augmente le risque de grosse gr\u00eale, de rafales destructrices et, plus rarement, de ph\u00e9nom\u00e8ne tourbillonnaire.<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/potentialite_supercellules_lundi_google_discover.jpg\" \/><\/p>\n<p><em>Potentiel de supercellules lundi soir, obtenu par la combinaison de l\u2019\u00e9nergie disponible dans l\u2019atmosph\u00e8re et du cisaillement du vent entre 0 et 6 km.<\/em><\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<h2>Des rafales pouvant localement approcher 120 km\/h<\/h2>\n<p>\u00a0<\/p>\n<p>Les simulations du mod\u00e8le AROME font appara\u00eetre un axe de tr\u00e8s fortes rafales allant du Sud-Ouest au centre-est et au nord-est du pays. Les valeurs les plus \u00e9lev\u00e9es sont simul\u00e9es sous les cellules orageuses les plus intenses, notamment entre le P\u00e9rigord, le Limousin, l\u2019Auvergne, la Bourgogne et la Lorraine.<\/p>\n<p>Dans ces secteurs, des rafales de 80 \u00e0 100 km\/h paraissent possibles sur une zone assez \u00e9tendue. Sous une supercellule ou une puissante rafale descendante, des pointes comprises entre 110 et 120 km\/h ne sont pas exclues tr\u00e8s localement. Certains sc\u00e9narios bruts vont m\u00eame ponctuellement au-del\u00e0, mais ces valeurs extr\u00eames doivent \u00eatre consid\u00e9r\u00e9es avec prudence.<\/p>\n<p>Une seconde zone de fortes rafales pourrait concerner l\u2019Occitanie, notamment entre le pi\u00e9mont pyr\u00e9n\u00e9en, la r\u00e9gion toulousaine et le sud du Massif central. De telles bourrasques peuvent provoquer des chutes de branches ou d\u2019arbres, endommager des toitures et rendre les d\u00e9placements temporairement dangereux.<\/p>\n<p>AROME est un mod\u00e8le \u00e0 maille fine utilis\u00e9 pour anticiper les ph\u00e9nom\u00e8nes m\u00e9t\u00e9orologiques de petite \u00e9chelle, notamment les pr\u00e9cipitations convectives, les rafales maximales et l\u2019instabilit\u00e9 orageuse.<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/rafales_vent_lundi_google_discover.jpg\" \/><\/p>\n<p><em>Rafales maximales simul\u00e9es par le mod\u00e8le AROME jusqu\u2019\u00e0 lundi soir, avec des pointes localement proches de 120 km\/h sous les orages les plus violents.<\/em><\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<h2>Des gr\u00ealons d\u00e9passant localement 5 cm<\/h2>\n<p>\u00a0<\/p>\n<p>La gr\u00eale constituera probablement l\u2019un des principaux dangers de cette d\u00e9gradation. La carte du potentiel maximal montre un risque \u00e9tendu de gr\u00eale du Sud-Ouest au Nord-Est, mais les plus gros diam\u00e8tres sont envisag\u00e9s entre le nord de l\u2019Occitanie, l\u2019Aquitaine et le P\u00e9rigord.<\/p>\n<p>Dans cette zone, des gr\u00ealons de 3 \u00e0 5 cm de diam\u00e8tre pourront accompagner les cellules les plus puissantes. Sous une supercellule particuli\u00e8rement vigoureuse, quelques gr\u00ealons sup\u00e9rieurs \u00e0 5 cm ne sont pas impossibles. Une telle taille correspond approximativement \u00e0 celle d\u2019une balle de golf et peut provoquer d\u2019importants d\u00e9g\u00e2ts sur les v\u00e9hicules, les cultures, les v\u00e9randas ou les toitures l\u00e9g\u00e8res.<\/p>\n<p>Plus au nord-est, de la Bourgogne au Grand Est, le risque de gr\u00eale restera pr\u00e9sent mais les diam\u00e8tres moyens pourraient \u00eatre plus modestes. Des noyaux tr\u00e8s localis\u00e9s pourront n\u00e9anmoins produire une gr\u00eale nettement plus grosse que dans les secteurs voisins.<\/p>\n<p>\u00a0<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/carte%20taille%20grele.png\" \/><\/p>\n<p><em>Taille maximale potentielle des gr\u00ealons lundi soir, avec un risque de gr\u00ealons atteignant ou d\u00e9passant localement 5 cm entre l\u2019Occitanie, l\u2019Aquitaine et le P\u00e9rigord.<\/em><\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<h2>Une pr\u00e9vision \u00e0 surveiller jusqu\u2019au dernier moment<\/h2>\n<p>\u00a0<\/p>\n<p>La localisation exacte des ph\u00e9nom\u00e8nes les plus violents ne peut pas \u00eatre d\u00e9termin\u00e9e pr\u00e9cis\u00e9ment \u00e0 l\u2019\u00e9chelle d\u2019un d\u00e9partement plusieurs heures \u00e0 l\u2019avance. Les supercellules sont souvent tr\u00e8s localis\u00e9es : une commune peut subir de la grosse gr\u00eale et des rafales destructrices tandis qu\u2019un secteur situ\u00e9 \u00e0 quelques kilom\u00e8tres reste relativement \u00e9pargn\u00e9.<\/p>\n<p>Les habitants des r\u00e9gions allant du Sud-Ouest au Grand Est devront donc suivre attentivement les prochaines actualisations, les \u00e9ventuelles vigilances officielles et l\u2019\u00e9volution des radars au cours de la journ\u00e9e de lundi. Il est conseill\u00e9 de mettre les v\u00e9hicules \u00e0 l\u2019abri lorsque cela est possible, de s\u00e9curiser les objets susceptibles d\u2019\u00eatre emport\u00e9s par le vent et d\u2019\u00e9viter les d\u00e9placements pendant le passage des cellules les plus actives.<\/p>\n<p>\u00a0<\/p>\n<p>A lire \u00e9galement :<\/p>\n<p>&gt;&gt;&gt; <a href=\"https:\/\/www.meteo-paris.com\/france\/previsions\">Notre bulletin M\u00c9T\u00c9O national pour l&#8217;explication de la situation g\u00e9n\u00e9rale<\/a><\/p>\n<p>&gt;&gt;&gt; <a href=\"https:\/\/www.meteo-paris.com\/ile-de-france\/suivi-des-pluies\">les cartes de suivi des pr\u00e9cipitations en temps r\u00e9el<\/a><\/p>\n<p>&gt;&gt;&gt; <a href=\"https:\/\/www.meteo-paris.com\/france\/suivi-orages\">les cartes de suivi des impacts de foudre en temps r\u00e9el<\/a><\/p>\n<p>&gt;&gt;&gt;\u00a0<a href=\"https:\/\/www.meteo-paris.com\/actualites\/orages-de-grele-une-menace-quotidienne-plane-desormais-sur-la-france\">Orages, gr\u00eale et fortes rafales : une nouvelle d\u00e9gradation menace la France d\u00e8s lundi<\/a><\/p>\n<p>\u00a0<\/p>\n<p>Auteur : <a href=\"https:\/\/www.meteo-paris.com\/guillaume-sechet\">Guillaume S\u00e9chet<\/a><\/p>\n<p>\u00a0<\/p>","protected":false},"excerpt":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader Lire la Suite Plusieurs vagues d\u2019orages parfois violents remonteront du Sud-Ouest vers le Nord-Est de la France au cours de la [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8574,"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-8573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-externes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>le 2 ao\u00fbt 2026 \u00e0 14h43 Orages violents lundi : les r\u00e9gions les plus expos\u00e9es \u00e0 la gr\u00eale et aux fortes rafales - 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\/le-2-aout-2026-a-14h43-orages-violents-lundi-les-regions-les-plus-exposees-a-la-grele-et-aux-fortes-rafales\/\" \/>\n<meta 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