{"id":386,"date":"2012-10-19T09:57:00","date_gmt":"2012-10-19T07:57:00","guid":{"rendered":"http:\/\/vandiepenbeeck.org\/?p=386"},"modified":"2012-10-19T09:57:00","modified_gmt":"2012-10-19T07:57:00","slug":"20-septembre-2012-gel-precoce","status":"publish","type":"post","link":"http:\/\/vandiepenbeeck.org\/?p=386","title":{"rendered":"20 septembre 2012 : gel pr\u00e9coce ?"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p class=\"MsoNormal\">Ce 20 septembre, du gel a \u00e9t\u00e9 observ\u00e9 en quelques stations de notre pays. Pour cette ann\u00e9e, c\u2019est donc le premier jour de gel. Beaucoup de personnes (journalistes) ont \u00e9t\u00e9 surpris de cette date, proche de l\u2019automne astronomique qui a d\u00e9but\u00e9 cette ann\u00e9e le 22 septembre \u00e0 16 h 38. Et pourtant cela n\u2019est pas si pr\u00e9coce que cela.<\/p>\n<p><!--more--><br \/>\n<!--[if gte mso 9]><xml>\n<o:OfficeDocumentSettings>\n<o:AllowPNG\/>\n<\/o:OfficeDocumentSettings>\n<\/xml><![endif]--><\/p>\n<p>&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify;\">En effet, des jours de gel en septembre ne sont pas rares. En 2003, le 3 septembre on observait d\u00e9j\u00e0 du gel \u00e0 Elsenborn et \u00e0 Neidingen dans la r\u00e9gion de Saint-Vith. Dans cette derni\u00e8re station, on avait mesur\u00e9 -1,0\u00b0C. Et pourtant, cette date n\u2019est pas encore celle du gel le plus pr\u00e9coce.<span style=\"mso-spacerun: yes;\">&nbsp; <\/span>On a d\u00e9j\u00e0 not\u00e9 des gel\u00e9es \u00e0 la fin du mois d\u2019ao\u00fbt&nbsp;: le 28 ao\u00fbt 1978 \u00e0 Bi\u00e8vre et Nadrin avec respectivement -0,8\u00b0C<span style=\"mso-spacerun: yes;\">&nbsp; <\/span>et<br \/> \u20130,2\u00b0C et le 30 ao\u00fbt <span style=\"mso-spacerun: yes;\">&nbsp;<\/span>2007 \u00e0 Elsenborn avec -0,6\u00b0C.<span style=\"mso-spacerun: yes;\">&nbsp; <\/span><\/p>\n<p>&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify;\">Au nord du sillon Sambre et Meuse, le gel le plus pr\u00e9coce est not\u00e9 le 16 septembre 1971 o\u00f9 les temp\u00e9ratures descendirent en-dessous de 0\u00b0C<span style=\"mso-spacerun: yes;\">&nbsp; <\/span>\u00e0 Ernage, Blanmont, Chi\u00e8vre, Kleine-Brogel, Gorsem, Wingene, Wasmuel, Ronqui\u00e8re, etc.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify;\">Le 19 septembre fut \u00e9galement <span style=\"mso-spacerun: yes;\">&nbsp;<\/span>une date de gel\u00e9e pr\u00e9coce pour quelques stations du nord du sillon Sambre et Meuse.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify;\">En juillet, on a \u00e9galement observ\u00e9 des gel\u00e9es. Ce fut le cas le premier juillet 1984&nbsp;: on relevait des temp\u00e9ratures n\u00e9gatives \u00e0 Rochefort (-1,2\u00b0C), Mont-Rigi, Maissin, Nadrin et Bi\u00e8vre. Mais dans ce cas-l\u00e0, on doit parler de gel tardif.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify;\">Ces gel\u00e9es sont dues \u00e0 diff\u00e9rent facteurs. Le plus important est la situation atmosph\u00e9rique. Lorsque nous sommes dans un anticyclone, g\u00e9n\u00e9ralement, l\u2019air est stable et m\u00eame tr\u00e8s stable au petit matin. Si le ciel est bien d\u00e9gag\u00e9, le refroidissement nocturne est important et la baisse de la temp\u00e9rature est importante. Le relief peut encore accentuer cet effet. En effet, dans les vall\u00e9es et les cuvettes, l\u2019air froid, plus lourd que l\u2019air chaud, va s\u2019\u00e9couler dans les parties basses du relief. Les vall\u00e9es et les cuvettes seront ainsi les premi\u00e8res r\u00e9gions o\u00f9 le gel apparaitra. Ainsi, la date moyenne de premi\u00e8re gel\u00e9e est, \u00e0 Rochefort, le 27\/09 alors, que sur les hauts-plateaux, elle est le 20\/10 \u00e0 Mont-Rigi&nbsp;! La nature du sol est aussi importante dans le fait de favoriser un refroidissement nocturne. Cette capacit\u00e9 de garder ou non la chaleur va avoir une influence sur la variation de la temp\u00e9rature de l\u2019air. Ainsi le sable ou le calcaire se refroidit et se r\u00e9chauffe plus vite que d\u2019autres mat\u00e9riaux comme le limon, les argiles. Les r\u00e9gions o\u00f9 le sol ne retient pas la chaleur se refroidiront plus vite que les autres.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify;\">Ce 20 septembre, nous nous trouvions dans ces conditions et le gel a s\u00e9vi notamment \u00e0 Elsenborn, Gouvy, Bi\u00e8vre et Aubange et quelques autres stations.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify;\">\u00c0 partir du 5, le mois de septembre connait chaque jour du gel quelque part en Belgique. Depuis 2001, seules les ann\u00e9es 2001, 2006 et 2011 n\u2019ont pas connu de gel en septembre&nbsp;! Cette ann\u00e9e reste donc dans la norme avec le fait que le mois de septembre connait plus souvent du gel qu\u2019une absence que ce ph\u00e9nom\u00e8ne.<\/p>\n<p>&nbsp;<\/p>\n<p><!--[if gte mso 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Pour cette ann\u00e9e, c\u2019est donc le premier jour de gel. Beaucoup de personnes (journalistes) ont \u00e9t\u00e9 surpris de cette date, proche de l\u2019automne astronomique qui a d\u00e9but\u00e9 cette ann\u00e9e le 22 septembre \u00e0 16 h 38. Et pourtant cela n\u2019est [&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-386","post","type-post","status-publish","format-standard","hentry","category-meteo"],"_links":{"self":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts\/386"}],"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=386"}],"version-history":[{"count":0,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts\/386\/revisions"}],"wp:attachment":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=386"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}