Why has Northeast monsoon remained subdued this year?

About 75 per cent of the country's annual rainfall is received from the Southwest monsoon between June and September. The Northeast monsoon ... HomeExplainedExplained:WhyhasNortheastmonsoonremainedsubduedthisyear? Premium Explained:WhyhasNortheastmonsoonremainedsubduedthisyear? RainfallovertheSouthernpeninsularregionhasbeendeficientsofar.ThereasonisaprevalentLaNiñacondition,alongwithalowpressurebeltthatiscurrentlylyingtothenorthofitsnormalposition. Writtenby AnjaliMarar ,EditedbyExplainedDesk Pune|Updated:November25,20205:33:09pm DarkcloudscovertheskiesofKochi.(ExpressPhoto:NirmalHarindran,File)WhatistheNortheastmonsoon,andwhyisitimportant? Indiareceivesrainfallduringtwoseasons.About75percentofthecountry’sannualrainfallisreceivedfromtheSouthwestmonsoonbetweenJuneandSeptember.TheNortheastmonsoon,ontheotherhand,occursduringOctobertoDecember,andisacomparativelysmall-scalemonsoon,whichisconfinedtotheSouthernpeninsula. Alsocalledthewintermonsoon,therainfallassociatedwiththeNortheastmonsoonisimportantforTamilNadu,Puducherry,Karaikal,Yanam,coastalAndhraPradesh,Kerala,northinteriorKarnataka,MaheandLakshadweep. SomeSouthAsiancountriessuchasMaldives,SriLankaandMyanmar,too,recordrainfallduringOctobertoDecember. TamilNadurecordsabout48percent(447.4mm)ofitsannualrainfall(943.7mm)duringthesemonths,makingitthekeyfactorforundertakingagriculturalactivitiesandreservoirmanagementinthestate.SubscriberOnlyStoriesViewAllPremiumExplainSpeaking:HowtoreadthelatestHumanDevelopmentReportPremium‘Manysmallstepsbygovernmentoverlastfewyearsstructurallysetting...PremiumAndrologist,CA,trader:MeetthecollectorsofPMmementosPremiumHowanIPSofficerusedsoftpolicingtocrackdownonillegalhoochdist...SubscribeNowtoget66%OFF AfterthecompletewithdrawaloftheSouthwestmonsoonfromthecountrytakesplacebymid-October,thewindpatternrapidlychangesfromthesouth-westerlytothenorth-easterlydirection.TheperiodaftertheSouthwestmonsoonseason,fromOctobertoDecember,isthepeaktimeforcyclonicactivityintheNorthIndianOceanregion—coveringtheArabianSeaandtheBayofBengal. Thewindsassociatedwiththeformationoflowpressuresystems,depressions,orcyclonesinfluencethismonsoon,andtherefore,therainfall.Timelyinformationoncyclonesthusbecomevitalforgovernmentsanddisastermanagementteamstoplancontingency. READ|HowTamilNaduisbracingforCycloneNivar HowhastheNortheastmonsoonseasonbeensofarthisyear? TheIndiaMeteorologicalDepartment(IMD)hadforecastbelownormalrainfalloverTamilNaduandnormalrainfalloverthesouthernpeninsulaforthecurrentseason.Advertisement Thisyear,theSouthwestmonsoonwithdrewcompletelyfromthecountryonOctober28,withadelayofafortnight.Onthesameday,theIMDdeclaredtheonsetoftheNortheastmonsoonoverpeninsularIndia. However,rainfallthereafterremainedlargelysubduedandremainedbelownormaltillaroundNovember10. IMD’sdatarecordsbetweenOctober1andNovember23showsignificantlybelow-normalrainoverLakshadweep(minus42percent),Puducherry(minus39percent),TamilNadu(minus25percent)andKerala(minus30percent).ThemajorityofdistrictsinTamilNaduremainhighlyrain-deficientasonNovember23.Advertisement Whatisthereasonforthedeficiencyofrainfallthisseason? OfficialsatIMDhavelinkedittotheprevailingLaNiñaconditionsinthePacificOcean. WhileElNiño(Spanishfor‘littleboy’),theexpressionheardmorecommonlyinIndia,istheabnormalsurfacewarmingobservedalongtheeasternandcentralregionsofthePacificOcean(regionbetweenPeruandPapuaNewGuinea),LaNiña(Spanishfor‘littlegirl’)isanabnormalcoolingofthesesurfacewaters. Together,theElNiñoandLaNiñaphenomenaaretermedasElNiñoSouthernOscillation(ENSO).Thesearelarge-scaleoceanphenomenawhichinflencetheglobalweather—winds,temperatureandrainfall.Theyhavetheabilitytotriggerextremeweathereventslikedroughts,floods,hotandcoldconditions,globally. Eachcyclecanlastanywherebetween9to12months,attimesextendableto18months—andre-occuraftereverythreetofiveyears. Meteorologistsrecordtheseasurfacetemperaturesforfourdifferentregions,knownasNiñoregions,alongthisequatorialbelt.Dependingonthetemperatures,theyforecasteitherasanElNiño,anENSOneutralphase,oraLaNiña.📣ExpressExplainedisnowonTelegramAdvertisement ButhowisLaNiñalinkedwiththeNortheastmonsoon? WhileLaNiñaconditionsenhancetherainfallassociatedwiththeSouthwestmonsoon,ithasanegativeimpactonrainfallassociatedwiththeNortheastmonsoon. DrDSivanandaPai,headofClimateResearchandServicesatIMD,Pune,saidthatduringLaNiñayears,thesynopticsystems—lowpressureorcyclones—formedintheBayofBengalremainsignificantlytothenorthoftheirnormalposition.“Besides,insteadofmovingwestwards,thesesystemsrecurve.Astheylietothenorthoftheirnormalposition,notmuchrainfalloccursoversouthernregionslikeTamilNadu,”DrPaisaid.Advertisement Inthisseason,SriLanka,too,hasexperiencedsubduedrainsofar. ThecurrentpositionoftheInterTropicalConvectiveZone(ITCZ)hasalsocontributedtothepoorrainfallduringtheongoingmonsoonseason.TheITCZisalow-pressurebelt,whosenorthwardandsouthwardmovementsalongtheequatordeterminetheprecipitationinthetropics.Currently,theITCZislocatedtothenorthofitsnormalposition.Advertisement CoronavirusExplainedCharlesIIIisKingofGreatBritain.Here'swhatwillhappennowRs17crorerecoveredinKolkatasearches:HowEDseizescash,whereisitkept?Pitbull,thestrong'bullybreed'ofdogthathasattackedseveralpeoplearoundDelhiClickhereformore AndwhatistherainfallforecastfortherestoftheNortheastmonsoonseason? SinceNovember10,therainfallovertheSouthernpeninsulahaspickedup;however,overallrainfallremainsdeficient. LaNiñaconditionsareexpectedtoprevailuntilearly2021,withsomeweathermodelsforecastingittolasteventillMarch.Asaresult,therearehighchancesthatthesouthernpeninsularregionmayendupwithdeficientrainfallbytheendoftheNortheastmonsoonseasoninDecember. Don’tmissfromExplained|China’sclimatecommitment:HowsignificantisitfortheEarth,andforIndia? ©TheIndianExpress(P)Ltd Firstpublishedon:24-11-2020at11:58:48am NextStoryAustraliaairlinebosswantsvaccinepassportfortravelers Tags: ExplainedClimate ExpressExplained IndiaMeteorologicalDepartment northeastmonsoon 0 Comment(s) * *Themoderationofcommentsisautomatedandnotclearedmanuallybyindianexpress.com. 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