{"id":31715,"date":"2024-12-27T20:30:55","date_gmt":"2024-12-27T20:30:55","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/phenomene-meteo-extraordinaire-le-tsunami-de-brouillard"},"modified":"2024-12-29T02:34:32","modified_gmt":"2024-12-29T02:34:32","slug":"phenomene-meteo-extraordinaire-le-tsunami-de-brouillard","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/phenomene-meteo-extraordinaire-le-tsunami-de-brouillard","title":{"rendered":"Ph\u00e9nom\u00e8ne M\u00e9t\u00e9o Extraordinaire : le Tsunami de Brouillard"},"content":{"rendered":"<p><b>par Karine Durand<br \/>\n<\/b><\/p>\n<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span>Sous certaines conditions me\u0301te\u0301o, le brouillard peut survenir de manie\u0300re spectaculaire. Un ve\u0301ritable mur de brouillard, en forme de vague ge\u0301ante, peut de\u0301ferler sur une plage en l&rsquo;espace de quelques minutes et provoquer une re\u0301action de panique chez ceux qui l&rsquo;aperc\u0327oivent !<\/p>\n<p>Lorsque ce phe\u0301nome\u0300ne est aperc\u0327u de loin, il donne l&rsquo;impression d&rsquo;apercevoir un tsunami dans le ciel. C&rsquo;est pour cette raison que ce phe\u0301nome\u0300ne me\u0301te\u0301o est connu sous le nom de \u00ab tsunami de brouillard \u00bb. Cette vague, non pas d&rsquo;eau, mais de vapeur d&rsquo;eau peut s&rsquo;e\u0301taler sur 40 kilome\u0300tres de distance et s&rsquo;e\u0301tirer sur plusieurs centaines de me\u0300tres de hauteur. En ge\u0301ne\u0301ral, ce phe\u0301nome\u0300ne se produit alors que le ciel e\u0301tait de\u0301gage\u0301 juste avant, le tsunami de brouillard semble donc sortir de nulle part.<\/p>\n<p>Il se forme au-dessus d&rsquo;une grande masse d&rsquo;eau, la mer ou un grand lac, en raison de la condensation de la vapeur d&rsquo;eau: il s&rsquo;agit en fait d&rsquo;un brouillard d&rsquo;advection lie\u0301 a\u0300 la pre\u0301sence d&rsquo;une masse d&rsquo;air chaud en altitude, et d&rsquo;une masse d&rsquo;air froid en bas (une mer plus froide).<\/p>\n<p>Le phe\u0301nome\u0300ne se produit donc le plus souvent a\u0300 la fin du printemps ou au tout de\u0301but de l&rsquo;e\u0301te\u0301, lorsque l&rsquo;eau n&rsquo;a pas encore eu le temps de se re\u0301chauffer, mais que de belles journe\u0301es chaudes sont de\u0301ja\u0300 possibles. L&rsquo;eau refroidit alors l&rsquo;air plus doux qui circule au-dessus, ce qui me\u0300ne a\u0300 la condensation.<\/p>\n<p>Il se forme ainsi un mur de brouillard, et celui-ci est ensuite pousse\u0301 par les brises qui circulent: le mur s&rsquo;enroule et c&rsquo;est alors qu&rsquo;apparai\u0302t la forme caracte\u0301ristique d&rsquo;un tsunami.<\/p>\n<p>Le tsunami de brouillard a l&rsquo;air si menac\u0327ant qu&rsquo;il est parfois confondu avec un autre phe\u0301nome\u0300ne me\u0301te\u0301o comple\u0300tement diffe\u0301rent: l&rsquo;arcus.<\/p>\n<p>Le nuage rouleau, ou arcus, apparai\u0302t a\u0300 l&rsquo;avant d&rsquo;un nuage d&rsquo;orage et son apparence peut effectivement e\u0302tre similaire a\u0300 celle d&rsquo;un tsunami de brouillard. L&rsquo;arcus est par contre beaucoup plus e\u0301pais, donc plus fonce\u0301, alors que le tsunami de brouillard est en ge\u0301ne\u0301ral tre\u0300s blanc.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Madagascar<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>par Karine Durand Africa-Press &#8211; Madagascar. Sous certaines conditions me\u0301te\u0301o, le brouillard peut survenir de manie\u0300re spectaculaire. Un ve\u0301ritable mur de brouillard, en forme de vague ge\u0301ante, peut de\u0301ferler sur une plage en l&rsquo;espace de quelques minutes et provoquer une re\u0301action de panique chez ceux qui l&rsquo;aperc\u0327oivent ! Lorsque ce phe\u0301nome\u0300ne est aperc\u0327u de loin, [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":31714,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[49],"class_list":["post-31715","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-madagascar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ph\u00e9nom\u00e8ne M\u00e9t\u00e9o Extraordinaire : le Tsunami de Brouillard - Madagascar<\/title>\n<meta name=\"description\" content=\"Sous certaines conditions me\u0301te\u0301o, le brouillard peut survenir de manie\u0300re spectaculaire. 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