Tropical storm in South America! Rare system Potira hit Rio de Janeiro, Brazil

Tropical storm in South America!

Very rare phenomenon has appeared near coast of Brazil early this week, with impact into Rio de Janeiro region.

The Brazilian Navy has upgraded a depression to Subtropical Storm Potira off the coast of Rio de Janeiro. South-American tropical systems are most common from November to May (in summer half in Southern Hemisphere), but can happen at any time of the year. This one is moving away from Brazil into the Atlantic.

According to Brazilian watchers /https://www.meteored.cl/noticias/pronostico/tormenta-subtropical-potira-llegara-con-intensas-lluvias-a-rio-de-janeiro-abril-2021-brasil.html/, Pontira is the first tropical storm in April which was developed near Brazilian coast since 2011.

Status of a tropical storm for this region of the world is almost impossible to reach, described Accuweather /https://www.accuweather.com/en/hurricane/subtropical-storm-potira-near-brazil/935912/. Main factor for very weak development of storms in Southern Atlantic is very strong wind shear.

The next important factor is SST (sea surface temperature) above Southern Atlantic waters, which is almost throughout all year insufficient to development of tropical disturbances.

Moreover, conditions above continent are currently very hot and stormy – many parts of Brazil reports tropical temperatures +30/+35°C and severe storms.

The strongest impacts of the systems are expected in Rio de Janeiro region, where rainfall up to 50 mm is possible, with local flash floods. Effects of the system however will be decreasing until Thursday, 22. April 2021 and storm wil stay active above Atlantic until the weekend.

Between years 2010 and 2019, only 9 storms such Potira appeared on the coast of South America (Brazil), but in 2020 and 2021 it is already 4th tropical storm only for 2 years. It should be linked with warming trend of SST near Brazilian coast, such as with changing of circulation patterns in the region.

Before 2010, these storms near South America were very rarely, however, Hurricane Catarina, Category 2 appeared around 28. March 2004 /https://en.wikipedia.org/wiki/Hurricane_Catarina/.

Catarina, only one South-American hurricane in history, brought 1-minnute sustained winds up to 155 km/h and record low pressure in South Atlantic, only 972 hPa. It caused 3-11 direct deaths in Brazil and 350 million damages mainly in the states of Santa Catarina and Rio Grande de Sul, southern Brazil.

Subtropical Storm #Potira had forms over the South Atlantic just offshore the East of Brazil. pic.twitter.com/nk7gU6WL0E

— Joint Cyclone Center (@JointCyclone) April 21, 2021

Subtropical Storm #Potira off the coast of #Brazil pic.twitter.com/xFLAP0PowN

— Stu Ostro (@StuOstro) April 20, 2021

Something going on off the coast of Brazil. Seems like another chance for one of those weak SATL subtropical cyclones. Decided to put a floater on this one. Check it out!https://t.co/jhrCLV6YXN pic.twitter.com/OGPkXPacgX

— Alex Boreham (@cyclonicwx) April 20, 2021

Subtropical Storm Potira Near Brazil. The start of the Atlantic hurricane season is still more than a month away, but a new and unusual tropical system has developed in a part of the Atlantic Ocean where tropical systems rarely occur. | AccuWeather https://t.co/pufeZJ4B4Z

— News That Matter (@jay1stnewyorker) April 21, 2021

The Brazilian Navy has upgraded a depression to Subtropical Storm #Potira off the coast of Rio de Janeiro.

These such systems are most common from Nov.-May, but can happen at any time of the year.

This one should move away from Brazil into the Atlantic. pic.twitter.com/Yoln09KuX1

— Jonathan ⚡☔ (@JonathanBelles) April 20, 2021

https://twitter.com/moroni_lima/status/1384537723185385472?s=20

Looks like MARINHA has designated this system as a subtropical depression in the South Atlantic off the coast of the state of #SaoPaulo, #Brazil. This could actually become a subtropical storm and even @NOAA is projecting that. The next name on the list is #Potira. #Tropics pic.twitter.com/Y1tRTERySD

— Storm’s Edge (@StormsEdgeWx) April 19, 2021

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