{"id":2455,"date":"2011-08-02T11:14:47","date_gmt":"2011-08-02T18:14:47","guid":{"rendered":"http:\/\/blog.kootenay-lake.ca\/?p=2455"},"modified":"2011-08-02T14:37:05","modified_gmt":"2011-08-02T21:37:05","slug":"pileus","status":"publish","type":"post","link":"https:\/\/blog.kootenay-lake.ca\/?p=2455","title":{"rendered":"Pileus"},"content":{"rendered":"<p style=\"padding: 2px 6px 4px 6px; margin: -10px 4px 0 8px; width: 337px; float: right; clear: left; color: #555555; background-color: #eeeeee; border: #dddddd 2px solid;\">In ancient times, <em>pileus<\/em> was the name of a brimless felt cap worn first by Greek sailors and then by Roman freed slaves. The word is now applied to the cap of a mushroom and the cloud that forms over the top of a vigorously growing cumulus cloud.<\/p>\n<p>I only see the pileus a few times a year.<\/p>\n<p>A pileus is a smooth cloud sometimes seen briefly over the top of a vigorously growing cumulus cloud. There were a few of them on the cumulus building around the Lake last Sunday.<\/p>\n<div id=\"attachment_2464\" style=\"width: 365px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2464\" class=\"size-full wp-image-2464 \" onmousedown=\"return false\" src=\"https:\/\/blog.kootenay-lake.ca\/wp-content\/uploads\/2011\/08\/mtymircapclds.jpg\" alt=\"\" width=\"355\" height=\"237\" \/><p id=\"caption-attachment-2464\" class=\"wp-caption-text\">A cap cloud sits over Mount Ymir<\/p><\/div>\n<p>A similar\u00a0looking cloud is frequently seen over the higher mountain peaks where it has the linguistically equivalent name of <em>cap cloud<\/em>. Such a cap cloud forms when a strong wind blows against the mountain and flows up and over it. Water vapour is cooled by the lifting and condenses to form the cloud. The vapour condenses on the upwind side, the resulting cloud droplets persist as the air flows across the mountain top, but then evaporate as the air flows down the lee side. As a consequence, a stationary cloud sits over the mountain top even though the wind howls though it.<\/p>\n<p>The pileus forms in a similar way when the growing cumulus cloud acts as a barrier to the winds near its top. Some web sources suggest that the pileus is composed of ice crystals, however, this is rarely the case. Rather, the pileus is almost always composed of water droplets.<\/p>\n<p>As moisture in the atmosphere is often in thin moist and dry layers, when the pileus forms, it too may appear laminated. The pileus is transient: the cumulus soon grows right through it and engulfs it\u2014something a mountain cannot do to a cap cloud.<\/p>\n<p>This pileus looks like an upside\u2013down dinner plate hanging over the cumulus cloud. It has multiple layers.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2456\" onmousedown=\"return false\" src=\"https:\/\/blog.kootenay-lake.ca\/wp-content\/uploads\/2011\/08\/pileus110731a.jpg\" alt=\"\" width=\"720\" height=\"480\" \/><\/p>\n<p>Another laminated pileus hangs over cumulus growing over the mountains around the Lake.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2465\" onmousedown=\"return false\" src=\"https:\/\/blog.kootenay-lake.ca\/wp-content\/uploads\/2011\/08\/pileus110731b.jpg\" alt=\"\" width=\"724\" height=\"480\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In ancient times, pileus was the name of a brimless felt cap worn first by Greek sailors and then by Roman freed slaves. The word is now applied to the cap of a mushroom and the cloud that forms over &hellip; <a href=\"https:\/\/blog.kootenay-lake.ca\/?p=2455\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-2455","post","type-post","status-publish","format-standard","hentry","category-weather"],"_links":{"self":[{"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=\/wp\/v2\/posts\/2455","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2455"}],"version-history":[{"count":38,"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=\/wp\/v2\/posts\/2455\/revisions"}],"predecessor-version":[{"id":2488,"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=\/wp\/v2\/posts\/2455\/revisions\/2488"}],"wp:attachment":[{"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2455"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2455"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.kootenay-lake.ca\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2455"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}