{"id":9873,"date":"2025-07-20T15:48:00","date_gmt":"2025-07-20T07:48:00","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=9873"},"modified":"2025-07-20T17:52:30","modified_gmt":"2025-07-20T09:52:30","slug":"dew-point-application-calculate-cloud-base","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/dew-point-application-calculate-cloud-base\/","title":{"rendered":"Dew Point Application &#8211; Calculate Cloud Base"},"content":{"rendered":"<p><strong>Degree C<\/strong><\/p>\n<p>Let&#8217;s say the temperature is 25\u00b0C and the dew point is 15\u00b0C.<\/p>\n<p>Convergence Rate (CR) = 2.5\u00b0C<\/p>\n<p>Temperature Dew Point Spread (TDS) = T-DP = 25 &#8211; 15 = 10\u00b0C<br \/>\nTDS \u00f7 CR = 10 \/ 2.5 = 4<br \/>\nMultiply by 1000 = 4 * 1000 = 4000 feet<br \/>\nTherefore, the estimated cloud base height is 4000 feet AGL<\/p>\n<p>Same way, just math : <strong>T-DP x 400 = cloud base in AGL (if add the field elevation will be the MSL!)<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Fahrenheit<\/strong><\/p>\n<p>Let&#8217;s say the temperature is 85\u00b0F and the dew point is 71\u00b0F.<\/p>\n<p>Convergence Rate (CR) = 4.4\u00b0F<\/p>\n<p>TDS = 85 \u00b0F \u2013 71 \u00b0F = 14 \u00b0F<\/p>\n<p>TDS \u00f7 CR\u00a0 = 14 \u00b0F \u00f7 4.4 \u00b0F = 3.18<\/p>\n<p>3.18 \u00d7 1,000 = 3,180 feet AGL<\/p>\n<p>The height of the cloud base is 3,180 feet AGL<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/youtu.be\/EivD77RGRR8?si=GyhN4WPpcF0gaIKe\">https:\/\/youtu.be\/EivD77RGRR8?si=GyhN4WPpcF0gaIKe<\/a><\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"Cloud Base Estimation\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/EivD77RGRR8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<div class=\"embed-container\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"LnlfddhyLo\"><p><a href=\"https:\/\/tommykwan.com\/blog\/aviation\/dew-point-dew-point-spread\/\">Dew point, Dew Point Spread<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;Dew point, Dew Point Spread&#8221; &#8212; Tommy&#039;s Diaries\" src=\"https:\/\/tommykwan.com\/blog\/aviation\/dew-point-dew-point-spread\/embed\/#?secret=MTWlC9m3j7#?secret=LnlfddhyLo\" data-secret=\"LnlfddhyLo\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/div>\n<div class=\"embed-container\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"lrOPULsqBt\"><p><a href=\"https:\/\/tommykwan.com\/blog\/aviation\/cloud-base-v-s-cloud-ceiling\/\">Cloud Base v.s Cloud Ceiling<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;Cloud Base v.s Cloud Ceiling&#8221; &#8212; Tommy&#039;s Diaries\" src=\"https:\/\/tommykwan.com\/blog\/aviation\/cloud-base-v-s-cloud-ceiling\/embed\/#?secret=EgPydxaZdP#?secret=lrOPULsqBt\" data-secret=\"lrOPULsqBt\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Degree C Let&#8217;s say the temperature is 25\u00b0C and the dew point is 15\u00b0C. Convergence Rate (CR) = 2.5\u00b0C Temperature Dew Point Spread (TDS) = T-DP = 25 &#8211; 15 = 10\u00b0C TDS \u00f7 CR = 10 \/ 2.5 = 4 Multiply by 1000 = 4 * 1000 = 4000 feet Therefore, the estimated cloud<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/dew-point-application-calculate-cloud-base\/\" title=\"Read More\"> <span class=\"button default\">Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64,72],"tags":[],"class_list":["post-9873","post","type-post","status-publish","format-standard","hentry","category-aviation","category-meteorology"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9873","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/comments?post=9873"}],"version-history":[{"count":5,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9873\/revisions"}],"predecessor-version":[{"id":9894,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9873\/revisions\/9894"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=9873"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=9873"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=9873"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}