@InProceedings{BritoEsco:2014:VCAsOc,
author = "Brito, Bruno Miranda de and Escobar, Gustavo Carlos Juan",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "VCAN associado com a ocorr{\^e}ncia de tempo severo no NEB em
novembro de 2013",
booktitle = "Anais...",
year = "2014",
organization = "Congresso Brasileiro de Meteorologia, 18.",
abstract = "
TheactingofanUpperLevelCyclonicVortex(ULCV),whichoccurredfromNovember2-6,2013,wasresponsibleforsevereweatherinmuchofNortheastBrazil(NEB).Atsomelocationsextremeprecipitationwasrecorded,suchas,forexample,inAracaju,Sergipe,wheremorethan130mmwereregisteredbetweenNovember3rdand4th.Theactingofthisatmosphericsystemassistedinbothpositiveandnegativeways.Inthefirstcase,partofNEBwaspunishedbydryweather,whichwasconsideredtheworstdroughtin65yearsduetothelowquantityandpoordistributionofrain.Thenegativeeffectaroseduetointenseprecipitationinisolatedlocations,inadditiontomanylightningflashes,strongwindandhailthatcausedimpactsontheaffectedsociety.Amongtheseimpacts,thefollowingstoodout:floods,fallentrees,roofdamagetohousesandfamilieswholosttheirhomes.Duetotheimpactsthatthisatmosphericphenomenonimposedonthepopulation,andalsobecauseitwaspredictedbyCPTEC/INPEthroughthepreparationofmeteorologicalwarnings,themotivationarosetoformthecurrentcasestudy.TheobjectiveofthisworkistoconductasynopticanalysisoftheextremeprecipitationeventthatoccurredinNEBduetotheactingofanULCV.ThisstudyalsoaimstoevaluatetheprecipitationfieldspredictedbythedifferentoperationalnumericalweatherpredictionmodelsatCPTEC/INPE(ETA15km,GFS,BRAMS5km,G3DVARandGlobalT299L64).Forthesynopticanalysis,satelliteimagesfromtheIR(enhanced)andwatervaporchannels,synopticchartsat250,500,700and850hPaproducedbyCPTEC/INPEandradiosoundingsfromNatal,RN,Recife,PEandSalvador,BAwereutilized.TheresultsshowedtheactingofanintensePalmertypeULCVinNEBforaperiodofapproximatelythreedays.Thecycloniccirculationassociatedwiththislowpressuresystemwasverifiedinthemiddleanduppertroposphereusingthe700,500and250hPalevels.InthecenteroftheULCVacoldcoreof-15°Cwasobservedat500hPa,whichcontributedtoalargerverticaltemperaturegradient(lapserate),favoringtheproductionofhailatsomelocationsinthestatesofAlagoas,RioGrandedoNorte,BahiaandSergipe.Theinstabilityindicespresentedvaluesthatindicatedpotentialforstrongconvection,intenseprecipitationandthunder.Convective-typecloudinesswasobservedprincipallyinthevicinityofthevortexcenter,duetothepresenceofthecoldcoreinthemiddlelevelsoftheatmosphere.Finally,ingeneralthenumericalweatherpredictionmodelsunderestimatedtheaccumulatedrainfallmeasuredbyraingaugesinareasofSergipe,althoughtheETA15kmmodelpresentedthebestresultwith
relationtotheintenserainregisteredonthecoastofthisstate. x.",
conference-location = "Recife, PE",
conference-year = "3-6 nov., 2014.",
urlaccessdate = "28 mar. 2024"
}