{"id":2495,"date":"2019-12-10T14:25:36","date_gmt":"2019-12-10T19:25:36","guid":{"rendered":"http:\/\/oceanweatherservices.com\/blog\/?p=2495"},"modified":"2024-04-30T11:42:11","modified_gmt":"2024-04-30T16:42:11","slug":"use-500-mb-chart-sea","status":"publish","type":"post","link":"https:\/\/oceanweatherservices.com\/blog\/2019\/12\/10\/use-500-mb-chart-sea\/","title":{"rendered":"Use of the 500 mb Chart at Sea"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The 500mb forecast chart is an excellent tool for mariners to estimate where to anticipate the heaviest sea and swell conditions as well as a guide to the expected surface storm tracks and intensities.\u00a0 The closer the height contours on the 500mb chart, the faster the upper level wind flow, the stronger the temperature contrasts and the more active is the surface weather below. The development and strengthening of surface lows and the associated bad weather most often occurs on the eastern side of 500mb troughs while surface high pressure and good weather is associated with the western side of these troughs.\u00a0 Without even looking at the surface pressure charts, a mariner can estimate what areas might be best to avoid.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Today\u2019s 500 mb chart of the North Pacific is a good example.<\/span><\/p>\n<div id=\"attachment_2496\" style=\"width: 650px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/oceanweatherservices.com\/blog\/wp-content\/uploads\/2019\/12\/500mb-12Z-10-Dec-analyis.gif\"><img aria-describedby=\"caption-attachment-2496\" decoding=\"async\" loading=\"lazy\" class=\"size-large wp-image-2496\" src=\"http:\/\/oceanweatherservices.com\/blog\/wp-content\/uploads\/2019\/12\/500mb-12Z-10-Dec-analyis-1024x652.gif\" alt=\"\" width=\"640\" height=\"408\" srcset=\"https:\/\/oceanweatherservices.com\/blog\/wp-content\/uploads\/2019\/12\/500mb-12Z-10-Dec-analyis-1024x652.gif 1024w, https:\/\/oceanweatherservices.com\/blog\/wp-content\/uploads\/2019\/12\/500mb-12Z-10-Dec-analyis-300x191.gif 300w, https:\/\/oceanweatherservices.com\/blog\/wp-content\/uploads\/2019\/12\/500mb-12Z-10-Dec-analyis-768x489.gif 768w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/a><p id=\"caption-attachment-2496\" class=\"wp-caption-text\">NOAA OPC 500 mb Analysis Dec<\/p><\/div>\n<p><strong>Note the actual significant wave height analysis<\/strong>\u00a0<a style=\"font-weight: bold; background-color: #f1f1f1; font-size: 12px; text-align: center;\" href=\"http:\/\/oceanweatherservices.com\/blog\/wp-content\/uploads\/2019\/12\/wave-height-00Z-10-dec-north-pac-analyis.gif\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2497 size-full\" src=\"http:\/\/oceanweatherservices.com\/blog\/wp-content\/uploads\/2019\/12\/wave-height-00Z-10-dec-north-pac-analyis-e1576005673851.gif\" alt=\"\" width=\"640\" height=\"408\" \/><\/a><\/p>\n<p><a href=\"https:\/\/ocean.weather.gov\/articles\/mariners_guide_500mb_chart.pdf\">Click here to read more about using the 500 mb chart at sea.<\/a><\/p>\n<div class=\"mceTemp\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The 500mb forecast chart is an excellent tool for mariners to estimate where to anticipate the heaviest sea and swell conditions as well as a guide to the expected surface storm tracks and intensities.\u00a0 The closer the height contours on &hellip; <a href=\"https:\/\/oceanweatherservices.com\/blog\/2019\/12\/10\/use-500-mb-chart-sea\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,57,102],"tags":[148,19,11,111],"_links":{"self":[{"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/posts\/2495"}],"collection":[{"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/comments?post=2495"}],"version-history":[{"count":4,"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/posts\/2495\/revisions"}],"predecessor-version":[{"id":3841,"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/posts\/2495\/revisions\/3841"}],"wp:attachment":[{"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/media?parent=2495"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/categories?post=2495"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oceanweatherservices.com\/blog\/wp-json\/wp\/v2\/tags?post=2495"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}