{"id":417,"date":"2015-07-29T15:33:47","date_gmt":"2015-07-29T13:33:47","guid":{"rendered":"http:\/\/vandiepenbeeck.org\/?p=417"},"modified":"2015-07-29T15:33:47","modified_gmt":"2015-07-29T13:33:47","slug":"phenomene-du-coup-de-chaleur","status":"publish","type":"post","link":"http:\/\/vandiepenbeeck.org\/?p=417","title":{"rendered":"Ph\u00e9nom\u00e8ne du coup de chaleur"},"content":{"rendered":"<p><!--[if gte mso 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5.4pt;\nmso-para-margin-top:0cm;\nmso-para-margin-right:0cm;\nmso-para-margin-bottom:10.0pt;\nmso-para-margin-left:0cm;\nline-height:115%;\nmso-pagination:widow-orphan;\nfont-size:11.0pt;\nfont-family:\"Calibri\",\"sans-serif\";\nmso-ascii-font-family:Calibri;\nmso-ascii-theme-font:minor-latin;\nmso-hansi-font-family:Calibri;\nmso-hansi-theme-font:minor-latin;}\n<\/style>\n\n\n<![endif]--><\/p>\n<p class=\"MsoNormal\">\u00c0 Troyes (Aube), le 17 juillet 2015, la temp\u00e9rature s&rsquo;est \u00e9lev\u00e9e de 24 \u00e0 33\u00b0C entre 22 h TU et 23 TU le 16 juillet suite \u00e0 des orages en \u00e9tat de d\u00e9sagr\u00e9gation situ\u00e9s au Sud-Est de la ville. 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5.4pt;\nmso-para-margin-top:0cm;\nmso-para-margin-right:0cm;\nmso-para-margin-bottom:10.0pt;\nmso-para-margin-left:0cm;\nline-height:115%;\nmso-pagination:widow-orphan;\nfont-size:11.0pt;\nfont-family:\"Calibri\",\"sans-serif\";\nmso-ascii-font-family:Calibri;\nmso-ascii-theme-font:minor-latin;\nmso-hansi-font-family:Calibri;\nmso-hansi-theme-font:minor-latin;}\n<\/style>\n\n\n<![endif]--><\/p>\n<p style=\"text-align: left;\"><a href=\"http:\/\/lameteo.blogs.lalibre.be\/media\/01\/00\/2945360591.png\" target=\"_blank\"><img decoding=\"async\" id=\"media-173352\" style=\"margin: 0.7em 0;\" title=\"\" src=\"http:\/\/lameteo.blogs.lalibre.be\/media\/01\/00\/669287553.png\" alt=\"Troyes.png\" \/><\/a><\/p>\n<p class=\"MsoCaption\">&nbsp;<\/p>\n<p class=\"MsoCaption\"><span style=\"color: windowtext;\">Figure<span style=\"mso-spacerun: yes;\"> 1 <\/span>: \u00e9volution de la temp\u00e9rature et de l&rsquo;humidit\u00e9 relative \u00e0 Troyes dans l&rsquo;Aube (France)<\/span><\/p>\n<p class=\"MsoNormal\">L\u2019explication est \u00e0 chercher dans ce que l\u2019on appelle en m\u00e9t\u00e9orologie un <em style=\"mso-bidi-font-style: normal;\">coup de chaleur<\/em> (en anglais heat burst). Ce ph\u00e9nom\u00e8ne rare en Europe, mais plus fr\u00e9quent aux \u00c9tats-Unis, se produit dans certains orages.<\/p>\n<p class=\"MsoNormal\">Ce ph\u00e9nom\u00e8ne n&rsquo;est pas totalement compris. L&rsquo;hypoth\u00e8se la plus couramment admise est que la pluie tombant dans de l&rsquo;air sec s&rsquo;\u00e9vapore en donnant de la virga et refroidit l&rsquo;air environnant. Par cons\u00e9quent, ce dernier devient plus dense et est acc\u00e9l\u00e9r\u00e9 vers le bas. En descendant rapidement, la masse d&rsquo;air se r\u00e9chauffe par compression adiabatique alors que la quantit\u00e9 de vapeur d&rsquo;eau y reste la m\u00eame, ce qui fait diminuer son humidit\u00e9 relative.<\/p>\n<p class=\"MsoNormal\">Quelques rappels&nbsp;:<\/p>\n<p class=\"MsoListParagraphCxSpFirst\" style=\"text-indent: -18.0pt; mso-list: l0 level1 lfo1;\"><span style=\"font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;\"><span style=\"mso-list: Ignore;\">\u00b7<span style=\"font: 7.0pt 'Times New Roman';\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span><\/span><\/span>La <strong style=\"mso-bidi-font-weight: normal;\">Rafale descendante<\/strong> (en anglais down burst)&nbsp;est un vent descendant tr\u00e8s rapidement vers le sol. En y parvenant, il peut \u00eatre \u00e0 l\u2019origine de d\u00e9g\u00e2ts tr\u00e8s importants. Il y a des rafales descendantes s\u00e8ches et humides.<\/p>\n<p class=\"MsoListParagraphCxSpMiddle\" style=\"margin-left: 35.4pt; mso-add-space: auto; text-indent: -18.0pt;\"><span style=\"mso-tab-count: 1;\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span>Dans le cas d&rsquo;une rafale descendante humide, l&rsquo;air est humide dans toute la couche, entre le sol et les niveaux moyens de l&rsquo;atmosph\u00e8re, o\u00f9 la descente se produit. De plus, l&rsquo;air des hauts niveaux, qui peut entrer dans l&rsquo;orage, est plus froid que celui-ci. Il est donc plus dense (pouss\u00e9e d&rsquo;Archim\u00e8de) et va lui aussi descendre. Le vent ainsi rabattu s&rsquo;accompagne alors de pluie.<\/p>\n<p class=\"MsoListParagraphCxSpMiddle\" style=\"margin-left: 35.4pt; mso-add-space: auto; text-indent: -18.0pt;\"><span style=\"mso-tab-count: 1;\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span>Une rafale descendante s\u00e8che se produit dans un environnement tr\u00e8s sec dans les bas niveaux sous l&rsquo;orage. Les pr\u00e9cipitations descendantes s&rsquo;\u00e9vaporent alors avant d&rsquo;atteindre le sol. La parcelle d&rsquo;air qui contenait ces pr\u00e9cipitations est alors plus froide que l&rsquo;environnement, par perte de chaleur due \u00e0 l&rsquo;\u00e9vaporation, et acc\u00e9l\u00e8re vers le bas. Il y a donc rafale sans pluie. Dans certains cas extr\u00eames, cette rafale descendante s\u00e8che peut provoquer un coup de chaleur.<\/p>\n<p class=\"MsoListParagraphCxSpMiddle\" style=\"text-indent: -18.0pt; mso-list: l0 level1 lfo1;\"><span style=\"font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;\"><span style=\"mso-list: Ignore;\">\u00b7<span style=\"font: 7.0pt 'Times New Roman';\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span><\/span><\/span><strong style=\"mso-bidi-font-weight: normal;\">Les virgas <\/strong>d\u00e9signent, en m\u00e9t\u00e9orologie, des pr\u00e9cipitations qui s\u2019\u00e9vaporent avant d\u2019arriver au sol. Cela se produit le plus souvent en \u00e9t\u00e9 quand l\u2019air pr\u00e8s du sol est tr\u00e8s chaud et sec et qu\u2019un nuage accompagn\u00e9 de pr\u00e9cipitations arrive sur cette zone. Les gouttes d\u2019eau s\u2019\u00e9vaporent avant de toucher le sol (Voir figure ci-dessous)<\/p>\n<p class=\"MsoListParagraphCxSpLast\" style=\"text-indent: -18.0pt; mso-list: l0 level1 lfo1;\"><span style=\"font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;\"><span style=\"mso-list: Ignore;\">\u00b7<span style=\"font: 7.0pt 'Times New Roman';\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span><\/span><\/span><strong style=\"mso-bidi-font-weight: normal;\">Adiabatique <\/strong>se dit d\u2019un processus de refroidissement ou de r\u00e9chauffement se produisant sans \u00e9change de chaleur. La d\u00e9tente d\u2019une masse d\u2019air provoque un refroidissement de cette masse et, a contrario, une compression adiabatique produit un r\u00e9chauffement.<\/p>\n<p class=\"MsoNormal\">Dans le cas de la saute de temp\u00e9rature \u00e0 Troyes, c\u2019est une rafale descendante s\u00e8che qui est \u00e0 l\u2019origine de ce coup de chaleur. Entre minuit et 1 heure du matin la temp\u00e9rature a augment\u00e9 de 9\u00b0C puis est progressivement revenue \u00e0 la temp\u00e9rature qui a pr\u00e9c\u00e9d\u00e9 le coup de chaleur.<\/p>\n<p class=\"MsoNormal\">D\u2019autres cas plus remarquables encore se produisent dans les plaines am\u00e9ricaines. Un exemple&nbsp;: le 3 ao\u00fbt 2008, \u00e0 Sioux Falls dans le Dakota du Sud, la temp\u00e9rature est pass\u00e9e de 24 \u00b0C \u00e0 38 \u00b0C en quelques minutes. Le ph\u00e9nom\u00e8ne a \u00e9t\u00e9 accompagn\u00e9 de rafale de vent de 80 \u00e0 100 km\/h.<\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"page-break-after: avoid;\">&nbsp;<\/p>\n<p style=\"text-align: left;\"><a href=\"http:\/\/lameteo.blogs.lalibre.be\/media\/01\/00\/1248672666.jpg\" target=\"_blank\"><img decoding=\"async\" id=\"media-173353\" style=\"margin: 0.7em 0;\" title=\"\" src=\"http:\/\/lameteo.blogs.lalibre.be\/media\/01\/00\/469052457.jpg\" alt=\"Virga.jpg\" \/><\/a><\/p>\n<p class=\"MsoNormal\" style=\"page-break-after: avoid;\"><span style=\"mso-fareast-language: FR; mso-no-proof: yes;\">&nbsp;<\/span><\/p>\n<p class=\"MsoCaption\"><span style=\"color: windowtext;\">Figure<span style=\"mso-spacerun: yes;\">&nbsp; <\/span>exemple de virga<\/span><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c0 Troyes (Aube), le 17 juillet 2015, la temp\u00e9rature s&rsquo;est \u00e9lev\u00e9e de 24 \u00e0 33\u00b0C entre 22 h TU et 23 TU le 16 juillet suite \u00e0 des orages en \u00e9tat de d\u00e9sagr\u00e9gation situ\u00e9s au Sud-Est de la ville. L&rsquo;humidit\u00e9 a&nbsp; alors baiss\u00e9 de 52 \u00e0 22% et une rafale de 69 km\/h a \u00e9t\u00e9 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-417","post","type-post","status-publish","format-standard","hentry","category-meteo"],"_links":{"self":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts\/417"}],"collection":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=417"}],"version-history":[{"count":0,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts\/417\/revisions"}],"wp:attachment":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=417"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}