{"id":126678,"date":"2026-09-29T11:43:12","date_gmt":"2026-09-29T06:13:12","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=126678"},"modified":"2026-09-29T11:43:12","modified_gmt":"2026-09-29T06:13:12","slug":"uttar-pradesh-floods-how-two-weather-systems-collided","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/uttar-pradesh-floods-how-two-weather-systems-collided\/","title":{"rendered":"Uttar Pradesh Floods: How Two Weather Systems Collided"},"content":{"rendered":"<h2><b>Uttar Pradesh Floods Latest News<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An intense three-day wet spell in Uttar Pradesh has left several districts facing a flood-like situation, disrupting normal life and damaging crops.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Between September 25 and September 27 morning, 56 people died and 46 were injured in rain and storm-related incidents, according to the state&#8217;s Office of Relief Commissioner. As many as 1,021 houses were damaged.<\/span><\/li>\n<\/ul>\n<h2><b>The Scale of the Impact<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heavy rain lashed Kanpur, Varanasi, Prayagraj, Gorakhpur, Bareilly, and several other parts of the state.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Strong winds reaching 30\u201340 kmph accompanied the downpour, uprooting trees and electric poles and inundating roads, lanes and villages.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The state received 45.1 mm of rainfall in the 24 hours ending September 27, against a normal of just 1.8 mm \u2014 a massive deviation.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">56 of Uttar Pradesh&#8217;s 75 districts recorded excessive rainfall.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">According to the India Meteorological Department (IMD), the flood-like situation stems from the likely interaction of two different weather systems.<\/span><\/li>\n<\/ul>\n<h2><b>The First System: A Deep Depression from the Bay of Bengal<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The IMD noted that a deep depression lay centred over parts of north-eastern Madhya Pradesh and adjoining south-eastern Uttar Pradesh.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The depression had formed over the Bay of Bengal, crossed the North Andhra Pradesh\u2013South Odisha coast, and then weakened.<\/span><\/li>\n<\/ul>\n<h3><b>What is a Depression?<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It is an organised low-pressure weather system.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A low-pressure area forms where atmospheric pressure is lower than surroundings, typically due to localised heating over a landmass from greater sunshine.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The heated air becomes less dense, rises, and lowers atmospheric pressure further.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Simultaneously, warm, moist air flows inward toward the low-pressure centre and moves upward, where it cools and condenses into clouds and rain (or snow).<\/span><\/li>\n<\/ul>\n<h3><b>Effects and Trajectory<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Depressions typically produce strong winds and heavy rain.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As a depression degrades into a well-marked low-pressure area, it loses strength \u2014 wind speeds drop, reducing rain intensity.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">By 5:30 am on Sunday, the IMD noted the system had moved north-northwestwards and weakened into a well-marked low-pressure area.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It was expected to continue in the same direction across Uttar Pradesh, gradually weakening further into a low-pressure area over the following 12 hours.<\/span><\/li>\n<\/ul>\n<h2><b>The Second System: A Western Disturbance<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The IMD&#8217;s note also flagged a &#8220;likely interaction&#8221; with a <strong><a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/western-disturbances-in-india\/\" target=\"_blank\">Western Disturbance (WD)<\/a><\/strong>, which could bring:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Strong gusty surface winds.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Heavy to very heavy rainfall, with isolated extremely heavy rainfall in the central Terai belt.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Exceptionally heavy rainfall (&gt;30 cm) at one or two places.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><b>What is a Western Disturbance (WD)?<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">WDs are weather systems that typically travel into northern India from the west.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">They are east-moving, rain-bearing wind systems originating beyond Afghanistan and Iran.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">They gather moisture from the Mediterranean Sea, Black Sea, Caspian Sea, and the Arabian Sea.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">WDs are essentially extra-tropical cyclones, formed through interactions between polar and tropical winds.<\/span><\/li>\n<\/ul>\n<h3><b>How WDs reach India<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The subtropical westerly jet stream \u2014 a high-altitude, fast-moving west-to-east air current \u2014 carries WDs toward the Himalayan and Tibetan highlands.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As moisture-laden WDs strike the Himalayas, they rise and cool, producing cloudy weather, rain, and thunderstorms, especially over north and northwest India.<\/span><\/li>\n<\/ul>\n<h3><b>Current Status<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The IMD&#8217;s weather bulletin for Uttar Pradesh noted this WD was present high up in the atmosphere as a trough \u2014 an elongated zone of relatively lower pressure \u2014 over northwestern India.<\/span><\/li>\n<\/ul>\n<h2><b>Why the Interaction Matters<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The interaction between the Western Disturbance and the deep depression, occurring even as the southwest monsoon withdraws across north and northwestern India, is what has produced these intense spells of rainfall over specific areas of Uttar Pradesh.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This timing is significant: two independent weather systems \u2014 one tropical (from the Bay of Bengal) and one extra-tropical (from west\/central Asia) \u2014 converged over the same region during the monsoon withdrawal phase, a period that already tends to be meteorologically unstable.<\/span><\/li>\n<\/ul>\n<h2><b>Conclusion<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uttar Pradesh&#8217;s floods illustrate how India&#8217;s weather is shaped by systems from opposite directions \u2014 a Bay of Bengal depression from the east, and a Western Disturbance from the west \u2014 meeting over the same terrain.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As the monsoon&#8217;s retreat becomes less predictable, such cross-system interactions may become a more frequent source of extreme, localised rainfall events.<\/span><\/li>\n<\/ul>\n<p><b>Source:<\/b> <strong><a href=\"https:\/\/indianexpress.com\/article\/explained\/explained-climate\/uttar-pradesh-floods-deep-depression-western-disturbance-10896406\/\" target=\"_blank\" rel=\"nofollow noopener\">IE<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uttar Pradesh floods intensify as a Bay of Bengal depression interacts with a Western Disturbance, causing heavy rainfall, deaths, crop damage and flooding.<\/p>\n","protected":false},"author":18,"featured_media":126723,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[60,22,59,10550],"class_list":["post-126678","post","type-post","status-publish","format-standard","has-post-thumbnail","category-upsc-mains-current-affairs","tag-mains-articles","tag-upsc-current-affairs","tag-upsc-mains-current-affairs","tag-uttar-pradesh-floods","no-featured-image-padding"],"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/126678","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=126678"}],"version-history":[{"count":4,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/126678\/revisions"}],"predecessor-version":[{"id":126733,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/126678\/revisions\/126733"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/126723"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=126678"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=126678"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=126678"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}