Sea level pressure is a measurement that is done in millibars or hectopascals. It is also known as atmospheric pressure. It is the average pressure of the air over a given area.<\/p>\n\n\n\n
Along 30\u00b0 N and 30\u00b0 S are found the high-pressure areas known as the subtropical highs. Further pole wards along 60\u00b0 N and 60\u00b0 S, the low-pressure belts are termed as the sub polar lows.<\/p>\n\n\n\n
At sea level the mean pressure is about 1,000 mb (100 kPa), varying by less than 5 percent from this value at any given location or time.<\/p>\n\n\n\n
Mean sea-level pressure values for the mid-winter months in the Northern Hemisphere are summarized in this first diagram, and mean sea-level pressure values for the mid-summer months are illustrated in the next diagram.<\/p>\n\n\n\n
Since charts of atmospheric pressure often represent average values over several days, pressure features that are relatively consistent day after day emerge, while more transient, short-lived features are removed.<\/p>\n\n\n\n
Those that remain are known as semipermanent pressure centres and are the source regions for major, relatively uniform bodies of air known as air masses.<\/p>\n\n\n\n
Warm, moist maritime tropical (mT) air forms over tropical and subtropical ocean waters in association with the high-pressure regions prominent there.<\/p>\n\n\n\n
Cool, moist maritime polar (mP) air, on the other hand, forms over the colder subpolar ocean waters just south and east of the large, winter oceanic low-pressure regions.<\/p>\n\n\n\n
Over the continents, cold dry continental polar (cP) air and extremely cold dry continental arctic (cA) air forms in the high-pressure regions that are especially pronounced in winter, while hot dry continental tropical (cT) air forms over hot desert like continental domains in summer in association with low-pressure areas, which are sometimes called heat lows.<\/p>\n","protected":false},"excerpt":{"rendered":"
Sea level pressure is a measurement that is done in millibars or hectopascals. It is also known as atmospheric pressure. It is the average pressure of the air over a given area. Along 30\u00b0 N and 30\u00b0 S are found the high-pressure areas known as the subtropical highs. Further pole wards along 60\u00b0 N and […]<\/p>\n","protected":false},"author":13,"featured_media":54649,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1761],"tags":[1838],"offerexpiration":[],"class_list":["post-54936","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-upsc-notes","tag-geography-notes"],"_links":{"self":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/54936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/comments?post=54936"}],"version-history":[{"count":1,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/54936\/revisions"}],"predecessor-version":[{"id":54940,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/54936\/revisions\/54940"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media\/54649"}],"wp:attachment":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media?parent=54936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/categories?post=54936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/tags?post=54936"},{"taxonomy":"offerexpiration","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/offerexpiration?post=54936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}