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<ul><li><strong>The latest forecast for the upcoming long weekend from India's Meteorological Department may be a dampener.</strong></li><li><strong>Rain clouds threaten to ruin India's Diwali festivities with rains and thundershowers.</strong></li><li><strong>The threat of the rains particularly high along the country's peninsular coast as seen in the image above.</strong></li></ul>Whether it is buying crackers for Diwali or planning a getaway for the long weekend, factor the possibility of a cyclonic storm called 'Kyarr' and thundershowers, particularly for people who live along or near the country's long coastline in places like Mumbai, Goa, Kochi, Chennai, and Vishakapatnam.<br /><br />Rain clouds threaten to ruin India's Diwali festivities with rains and thundershowers, according to the latest forecast from India's Meteorological Department.<br /><br />A well-marked Low pressure area has intensified into a Depression and it is located over east central Arabian Sea. A Cyclonic Circulation and a trough extended from this system is located over Odisha and adjoining area. These systems produce moderate to heavy and thunderstorms over Southern and Eastern India with torrential rain over localized places. The Cyclonic Circulation will gradually move northeastward and rainfall area spread over North Eastern India until Saturday, a Weather Channel report said.<br /><br />
  
  <div type="image" title="The Weather Channel forecast" msid="71731899" hostid="261" caption="&amp;lt;p&amp;gt;The Cyclonic Circulation will gradually move northeastward and rainfall area spread over North Eastern India until Saturday, a Weather Channel report said.&amp;lt;/p&amp;gt;"></div>





<br /><br />Rain totals of over 150 mm in 48 hour are likely with localized spots receiving up to 200 mm over Odisha, Meghalaya, West Bengal and part of Jharkhand until Saturday morning. Total rainfall of over 100-120 mm in 48 hours is likely over Goa and adjoining area until Saturday.<br /><br />The threat of the rains particularly high along the country's peninsular coast as seen in the image above. "It is very likely to concentrate into a depression during next 24 hours and into a cyclonic storm during the subsequent 48 hours," a Met Department official said. There is also a 'yellow alert' forecasting heavy rains in and around Mumbai and Thane. <br /><br />Indians have a clutch of festivities starting from Dhanteras on Friday to Bhaubeej on Tuesday (October 29), with Diwali and Lakshmi Puja in between. The Met Dept has also warned the coutnry's fishermen to not venture out into the sea on Saturday and Sunday.<br /><br /><br />

Diwali weekend plans must factor in a possible cyclonic storm and thundershowers

<h2><div class="KonaFilter image-container display-table"><div><div class="image on-image"><p class="source"><span>Christian Aslund/Greenpeace</span></p><p class="caption">The ship, Arctic Sunrise, surrounded by ice floes in the ocean near Svalbard, Norway.</p></div><p></p></div></div></h2><ul class="summary-list"><li>The ocean current system in the Atlantic Ocean, called <a href="https://www.businessinsider.com/climate-change-amoc-day-after-tomorrow-2017-1">the Atlantic Meridional Overturning Circulation</a> (AMOC), is responsible for western Europe's warm temperatures.</li><li>But according to a new report from the United Nations, rising water temperatures and changes to the salinity of the world's oceans is causing the AMOC to weaken. </li><li><a href="https://www.businessinsider.com/day-after-tomorrow-was-right-and-wrong-about-climate-shifts-2019-3">Other recent research</a> has found that the AMOC could slow significantly if enough fresh water from melting ice enters the ocean.</li><li>Weaker current circulation could bring <a href="https://www.businessinsider.com/polar-vortex-hitting-us-might-be-connected-to-global-warming-2019-1">more extreme weather</a> to the Northern Hemisphere.</li><li>A version of this scenario is depicted in the movie "The Day After Tomorrow," though the film isn't scientifically accurate.</li><li><a href="https://www.businessinsider.com/?hprecirc-bullet">Visit Business Insider's homepage for more stories</a>.</li></ul><p>Unprecedented melting of the Arctic and Antarctic ice sheets, combined with warming ocean water, could cause sea levels to rise by more than 3 feet by the end of the century, according to new report.</p><p>The assessment was compiled by more than 100 authors from 36 countries as part of the United Nations' Intergovernmental Panel on Climate Change (IPCC). The findings suggest that as melting glaciers add vast amounts of much fresh water to the world's oceans, the current system in the Atlantic is likely to weaken over time.</p><p>This system, called the Atlantic Meridional Overturning Circulation (AMOC), moves ocean water north and south in the Atlantic and mixes surface water with that from deep below. It's partially responsible for western Europe's warm and wet climate.</p><p>The UN report concluded that "the AMOC is projected to weaken in the 21st century" under every climate-change scenario. That means changes are coming to the north Atlantic even if we significantly limit greenhouse-gas emissions (and, consequently, planetary warming).</p><p><em><strong>Read More:</strong> <a href="https://www.businessinsider.com/sea-level-rise-3-feet-in-80-years-un-report-2019-9">Sea levels are projected to rise 3 feet within 80 years, according to a new UN report. Hundreds of millions of people could be displaced.</a></em></p><p>"We are definitely going into a world where AMOC is getting weaker," Francesco Muschitiello, the author of a different study about the AMOC, <a href="https://www.businessinsider.com/day-after-tomorrow-was-right-and-wrong-about-climate-shifts-2019-3">previously told Business Insider</a>.</p><p>As that happens, Europe could get colder, drier weather, and the tropics could experience stronger hurricanes.</p><h2>Why melting glaciers and warming oceans weaken ocean currents</h2><p>Scientists liken the AMOC to a kind of water conveyor belt.</p><p>Once warmer water reaches the area around the UK, it cools and sinks to the bottom of the Labrador and Nordic Seas. Then that cold water makes a U-turn and snakes its way along the ocean floor, all the way down to Antarctica's Southern Ocean.</p><p>When the AMOC is flowing quickly, western Europe enjoys a wet and warm climate. But if it gets sluggish and weak, warm tropical waters don't get moved up, and the north Atlantic cools.</p><h2><div class="KonaFilter image-container display-table"><div><div class="image on-image"><p class="source"><span><a href="https://www.nasa.gov/topics/earth/features/atlantic20100325.html">NASA/JPL</a></span></p><p class="caption">The Atlantic Meridional Overturning Circulation carries warm water from the tropics into the North Atlantic (in red), where the water cools and sinks before flowing back south (in blue).</p></div><p></p></div></div></h2><p>The AMOC's speed depends on a delicate balance of salt and fresh water. Salty water is dense, so it sinks easily. But as Greenland and Antarctica's ice sheets melt, along with glaciers around the world, more fresh water is joining the AMOC.</p><p>That <a href="https://www.businessinsider.com/greenland-approaching-threshold-of-irreversible-melting-2019-1">melting is happening quickly</a>, the UN report confirmed. Greenland's ice is melting six times faster now than it was four decades ago, according to <a href="https://www.pnas.org/content/early/2019/04/16/1904242116">an April study</a> - the ice sheet is sloughing off an estimated 286 billion tons of ice per year. Two decades ago, the annual average was just 50 billion.</p><p><em><strong>Read more</strong>: <a href="https://www.businessinsider.com/greenland-approaching-threshold-of-irreversible-melting-2019-1">Greenland is approaching the threshold of an irreversible melt, and the consequences for coastal cities could be dire</a></em></p><p>In Antarctica, meanwhile, the entire <a href="https://www.businessinsider.com/un-report-devastating-arctic-temperature-rise-locked-in-2019-3">ice sheet is melting</a> nearly six times as fast as it did 40 years ago. In the 1980s, Antarctica lost 40 billion tons of ice annually. In the last decade, that number jumped to an average of 252 billion tons per year.</p><p>The addition of all that fresh water makes the salty surface water lighter and less likely to sink, <a href="https://www.scientificamerican.com/article/slow-motion-ocean-atlantics-circulation-is-weakest-in-1-600-years/">clogging up the circulation's flow</a> and weakening the AMOC.</p><h2>A weaker AMOC could mean more extreme weather</h2><p>The authors of the UN report, which focuses on the state of the world's oceans and cryosphere (the frozen parts of the planet) say they're somewhat confident that the AMOC has already weakened relative to the period from 1850-1900.</p><p>According to <a href="https://www.nature.com/articles/s41586-018-0007-4.epdf?author_access_token=fsib90gIobI_Agb9Y6Dv_tRgN0jAjWel9jnR3ZoTv0MAQC0usmARmECubT0sv_73uaai5H7Fy0aRKV4rH49xk-nG4CZmf52MUw8oGrE-ospQrzV3yPTNbpOmvENmVJ5M7TaTsKJASsuLaOE-wy0tVw%3D%3D">a 2018 study</a>, the AMOC is the <a href="https://grist.org/article/relax-the-day-after-tomorrow-isnt-going-to-happen-like-tomorrow/">weakest it's been in at least 1,600 years</a>.</p><p>That weakening is likely to cause changes in our global climate, according to the report, including more storms in northern Europe as well as a decrease in the amount of organic matter produced and circulated in the north Atlantic's marine food web. </p><p>It would also lead to less summer rainfall in southern Asian and the central African Sahel, so parts of central and west Africa could experience more drought conditions.</p><p><div class="KonaFilter image-container display-table"><div><div class="image on-image"><p class="source"><span><a href="https://www.flickr.com/photos/gsfc/6127588860/">NASA</a></span></p><p class="caption">Four tropical cyclones, Katia, Lee, Maria and Nate, were seen in the Atlantic Ocean basin on September 8, 2011.</p></div><p></p></div></div></p><p>"We'll see more extreme weather patterns for sure," Muschitiello said. "Europe will get colder and drier in the long run. There will be surplus of heat in subtropics, which is important for hurricane formation."</p><p>When subtropical waters are warmer, that contributes to more frequent and intense hurricanes in the Atlantic, since warm air holds more water vapor - and that additional moisture <a href="https://www.ucsusa.org/global-warming/science-and-impacts/impacts/hurricanes-and-climate-change.html">provides fuel for hurricanes</a>.</p><p>A weakening in the AMOC would also cause sea levels to rise along along the northeast coast of North America.</p><h2>Could the AMOC ever stop completely?</h2><p>In the 2004 film "The Day After Tomorrow," the AMOC stops almost overnight and an ice age descends on Europe and North America. People freeze to death in the streets, helicopters fall out of the sky, and a massive tidal wave engulfs New York City.</p><p>Those effects are not scientifically accurate and were hyperbolized in the film, of course, but the idea that Atlantic water circulation could shut down isn't wholly outside the realm of possibility. It's just highly unlikely.</p><p><div class="KonaFilter image-container display-table"><div><div class="image on-image"><p class="source"><span>20th Century Fox</span></p><p class="caption">In the 2004 movie, "The Day After Tomorrow," the AMOC shuts down completely.</p></div><p></p></div></div></p><p>According to Muschitiello, there are "reconstructions that suggest that the AMOC stopped entirely in the past, and that these major distortions of the AMOC led to the coldest events ever recorded."</p><p>But such an occurrence would require a huge amount of melt water - the past distortions Muschitiello is referring to happened after large swarms of icebergs broke off glaciers and floated into the north Atlantic ocean. When those iceberg armadas melted, that added an excess of fresh water into the ocean, wreaking havoc on the AMOC.</p><p>However, that influx of fresh water was several orders of magnitude higher than today's melting rates.</p><p><div class="KonaFilter image-container display-table"><div><div class="image on-image"><p class="source"><span>Pauline Askin/Reuters</span></p><p class="caption">Melting ice shows through at a cliff face at Landsend, on the coast of Cape Denison in Antarctica January 2, 2010.</p></div><p></p></div></div></p><p>A <a href="http://advances.sciencemag.org/content/3/1/e1601666">2017 study</a> found that if the concentration of carbon dioxide in the atmosphere instantaneously doubled from the 1990 level, the AMOC could <a href="https://www.businessinsider.com/climate-change-could-shut-down-the-current-that-carries-warm-water-2017-9">collapse in 300 years</a>. Greenhouse-gas emissions are not likely to increase that dramatically, though.</p><p>The authors of the UN report also concluded that "a collapse is very unlikely." They noted, though, that it would be even more unlikely in a future with less greenhouse-gas emissions.</p>    <div class="margin-top">        <h3>NOW WATCH: <a href="https://www.businessinsider.com/teen-came-up-with-a-plan-to-clean-ocean-2016-2">This brilliant idea uses the ocean's own currents to clean up garbage</a></h3>        <div>                    </div>    </div>

Melting ice is slowing down the Atlantic ocean's circulation system. Yes, that's similar to what happens in 'The Day After Tomorrow.'

<p><div class="KonaFilter image-container display-table float_right"><div><div class="image on-image"><p class="source"><span>Reuters/Robert Frank</span></p><p class="caption">It's going to be snowy and very cold.</p></div><p></p></div></div></p><p>A cold-weather '<a href="http://www.businessinsider.com/category/bomb-cyclone">bomb cyclone</a>' is bearing down on the East Coast, bringing up to a foot of snow and bone-chilling temperatures across the region.</p><p>The storm is currently sitting off the coast of Florida and Georgia, and will work its way up the East Coast on Wednesday night and Thursday. New York City and Philadelphia are under a winter weather advisory starting at 1 a.m. on Thursday, while Boston is under a blizzard warning starting at the same time.</p><p>While snowfall is expected to grind traffic and air travel to a halt on Thursday, the bigger problem is <a href="http://www.businessinsider.com/cold-weather-bomb-east-coast-worst-youve-ever-seen-2018-1">the freezing temperatures set to descend on the region</a> in the storm's wake. The circulation associated with the massive storm will drag frigid air sitting over Canada's Arctic south, plunging temperatures across the Northeast to below zero Farenheit. </p><p>Here's where the storm will hit where you live, and what to expect: </p>

Here's when the 'bomb cyclone' will hit, how cold it will be, and how much snow will fall on the East Coast

<p></p><div class="KonaFilter image-container display-table"><div><div class="image on-image"></div><p></p></div></div><ul><li><strong>Bomb cyclone, explosive bombogenesis, and polar vortex are real meteorological terms.</strong></li><li><strong>But the weather phenomena they describe aren't as uncommon as the words might suggest - there are probably 40-50 storms in the northern hemisphere that qualify as bombs every year.</strong></li><li><strong>The cold air brought by the polar vortex is a real reason to be concerned.</strong></li></ul><p><br>A "bomb cyclone" is <a href="http://www.businessinsider.com/cold-weather-bomb-east-coast-snow-record-lows-2018-1">headed for the Northeast</a>.</br></p><p>If you're wondering whether that term was only&#xa0;<a href="https://twitter.com/search?q=%22bomb%20cyclone%22%20term&amp;src=typd">created to make you pay attention</a> to the weather, you're not alone.</p><p>But "bomb cyclone" is a <a href="http://glossary.ametsoc.org/wiki/Bomb">real meteorological term</a> - as are the "explosive bombogenesis" and "polar vortex" coming along with this storm. Those names can make the phenomena sound more intense than the normal (though still potentially dangerous) winter events they describe. But the cold that comes with the polar vortex is no joke.</p><p>The term <strong>bomb cyclone</strong> <a href="https://twitter.com/MJVentrice/status/948595676111360000">dates back</a> to a <a href="http://journals.ametsoc.org/doi/pdf/10.1175/1520-0493%281980%29108%3C1589%3ASDCOT%3E2.0.CO%3B2">1980 paper by Frederick Sanders and John Gyakum</a>, which described the phenomenon as a "bomb." That sounds dramatic, but it actually refers to an extratropical surface cyclone: a storm occurring outside of tropics, usually between 30 and 60 degrees latitude if it happens in the Northern Hemisphere, whose central pressure falls at least 24 millibars over a 24-hour period.</p><p><strong>Central pressure</strong> is the measure of how much the atmosphere in the middle of a storm weighs, and it's one of the key indicators of any cyclone's intensity. The lower the air pressure in the middle of the storm, the more intense that cyclone is. Normal air pressure <a href="https://www.washingtonpost.com/news/capital-weather-gang/wp/2018/01/03/no-need-to-duck-and-cover-this-is-the-bomb-cyclone-explained/?nid&amp;utm_term=.f113e65a01cf">is about</a> 1010 millibars; when central pressure is lower than that, things become more turbulent, with more air movement and wind kicking up.</p><p>This particular storm looks like it's going to be intense, potentially dropping 45 millibars in 24 hours.</p><p>That could put it on an intensity level close to that of Hurricane Sandy.</p><p>When a storm undergoes a rapid pressure drop, that's known as "<strong>explosive bombogenesis</strong>." It happens on average between 40 and 50 times in the Northern Hemisphere each year, <a href="https://twitter.com/RyanMaue/status/948599901994221568">according to meteorologist Ryan Maue</a>.</p><p>A storm that becomes this intense in such a quick period of time is worth paying attention to. The flooding and wind gusts that will come with the current weather system will be enough to down power lines. That's especially bad when it's really cold out - and if you've stepped outside on the East Coast lately, enough said.</p><p></p><div class="KonaFilter image-container display-table float_right"><div><div class="image on-image"></div><p></p></div></div><p>The intense cold is likely to become worse in the aftermath of the storm, due to an expanded <strong>polar vortex</strong>.</p><p>The term&#xa0;<a href="http://glossary.ametsoc.org/wiki/Polar_vortex">polar vortex</a>, which most of us didn't hear much about until 2014, describes the swirling low pressure <a href="http://www.nws.noaa.gov/os/cold/polar_vortex.shtml">masses of cold air that always surround Earth's poles</a>, according to the National Weather Service.</p><p>Sometimes, that mass of air expands and gets pushed south, carried along with the <a href="http://glossary.ametsoc.org/wiki/Polar-front_jet_stream">jet stream</a>, a stream of wind that extends around the hemisphere and divides the air masses in the polar region from those further south.</p><p>The air circulation coming with this imminent storm could help pull the jet stream and even more arctic air south, bringing temperatures to parts of the US that are simply&#xa0;<a href="http://www.businessinsider.com/when-is-it-too-cold-to-go-outside-2018-1">too cold for people to safely be outside.</a></p><div></div>    <div class="margin-top">        <h3>NOW WATCH: <a href="http://www.businessinsider.com/what-is-el-nino-la-nina-weather-hurricanes-storms-2017-10">How El Niño and La Niña affect weather</a></h3>        <div>                    </div>    </div></hr>

A 'bomb cyclone' and 'polar vortex' are headed for the East Coast - here's what those weather terms actually mean

<ul class="summary-list"><li>An orange alert for heavy rainfall has been issued in Mumbai for the coming days.</li><li>The weather warning coincides with the Ambani wedding, featuring a star-studded guest list.</li></ul><p>Heavy rain could put a dampener on the celebrations of Anant Ambani and his wife-to-be, Radhika Merchant at their lavish wedding in Mumbai this weekend.</p><p><a target="_blank" class="" href="https://mausam.imd.gov.in/imd_latest/contents/subdivisionwise-warning.php">The India Meteorological Department has issued an orange alert</a> for the Maharashtra region, where Mumbai is situated, due to the possibility of heavy to very heavy rainfall over the next five days.</p><p>Anant Ambani, the son of India's richest person, <a target="_blank" class="" href="https://www.businessinsider.com/ambani-richest-family-in-asia-india-lifestyle-home-wedding-photos-2018-12">Mukesh Ambani</a>, is celebrating his ceremony across an opulent <a target="_blank" class="" href="https://www.businessinsider.com/what-goes-into-planning-celebrity-wedding-ambani-india-millionaires-ceremony-2024-7">three days of festivities</a>, with a star-studded guest list including <a target="_blank" class="" href="https://www.businessinsider.com/kim-kardashian-single-mom-overwhelming-therapist-2024-6">Kim Kardashian</a> and <a target="_blank" class="" href="https://www.businessinsider.com/john-kerry-steps-down-from-biden-administration-special-presidential-envoy-2024-1">John Kerry</a>, the former US secretary of state, according to CNBC TV-18, which obtained the guest list from event organizers.</p><p>After <a target="_blank" class="" href="https://www.businessinsider.com/anant-ambani-katy-perry-backstreet-boys-pre-wedding-party-2024-6">a string of extravagant celebrations</a> beginning in March, billionaire Ambani's youngest child <a target="_blank" class="" href="https://www.businessinsider.com/ambani-pre-wedding-celebration-with-justin-bieber-performance-2024-7">will marry</a> Radhika Merchant, the daughter of Viren and Shaila Merchant, both pharmaceutical tycoons, in Mumbai.</p><p>The weather warning is attributed to a monsoon trough and cyclonic circulation over the state of Maharashtra. Heavy rain is common during India's monsoon season, which runs from June to September.</p><p>Mumbai recorded almost 30 centimeters of rain in a single day earlier in the week, <a target="_blank" class="" href="https://www.bloomberg.com/news/articles/2024-07-08/heavy-rains-paralyze-mumbai-city-flights-and-trains-disrupted?embedded-checkout=true">Bloomberg reported.</a></p><div type="image" title="Children play near a rickshaw in a flooded street in Mumbai, India on July 8, 2024" height="3697" width="5500" msid="111696647" hostid="261"></div><p>An orange warning is an "alert" under the IMD's system, and <a target="_blank" class="" href="https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/imd-issues-orange-alert-for-delhi-know-what-this-means-and-how-to-stay-safe/articleshow/111396506.cms">according to the Times of India,</a> it can include weather that disrupts transport and travel, lowered visibility, and, in some areas, can cause landslips.</p><p>Heavy rain on Friday caused some roads in the city to flood, <a target="_blank" class="" href="https://timesofindia.indiatimes.com/city/mumbai/mumbai-rains-live-updates-maharashtra-traffic-local-trains-orange-alert-heavy-rainfall-waterlogging-mumbai-airport/liveblog/111676623.cms">the Times of India reported.</a></p><p>Due to the heavy rains, Air India issued an important update in a post on X on Friday, encouraging passengers to depart early to the airport to avoid delays.</p><p>"Flights to and from Mumbai are getting affected due to heavy rains," <a target="_blank" href="https://x.com/airindia/status/1811615422070063507">the post said</a>.</p><p>"Guests are advised to start early for the airport, as slow traffic and waterlogging may delay movement."</p><p>The Press Trust of India <a target="_blank" href="https://x.com/PTI_News/status/1811619558261698570?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1811619558261698570%7Ctwgr%5Ea32aeac87471733a135c2d495ecbdb620f875154%7Ctwcon%5Es1_&amp;ref_url=https%3A%2F%2Fwww.cnbctv18.com%2Findia%2Fwatch-mumbai-rains-terminal-2-of-chhatrapati-shivaji-maharaj-international-airport-flooded-19442334.htm">uploaded a video</a> to X showing waterlogging following heavy rainfall at terminal two of Mumbai's Chhatrapati Shivaji Maharaj International Airport, the airport's terminal for international flights.</p><p><a target="_blank" class="" href="https://www.flightradar24.com/airport/bom/departures">According to data from FlightRadar24,</a> as of 12 p.m. ET Friday, around 57% of flights arriving in Mumbai had been delayed, while around 79% of departures were late.</p>

You Searched For "cyclonic circulation" and got 5 results

Diwali weekend plans must factor in a possible cyclonic storm and thundershowers

BI India Bureau

Melting ice is slowing down the Atlantic ocean's circulation system. Yes, that's similar to what happens in 'The Day After Tomorrow.'

Aylin Woodward

Here's when the 'bomb cyclone' will hit, how cold it will be, and how much snow will fall on the East Coast

Jeremy Berke

A 'bomb cyclone' and 'polar vortex' are headed for the East Coast - here's what those weather terms actually mean

Kevin Loria

Heavy rain could put a dampener on the lavish Ambani wedding, with flight delays and flooded roads in Mumbai

Nora Redmond

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