Subtropical Storm Ubá

Subtropical Storm Ubá was the fourth tropical or subtropical cyclone to form in the South Atlantic Ocean in 2021.[1] Ubá originated from an area of low pressure that formed off the coast of Rio de Janeiro and evolved into a subtropical cyclone on 10 December. The cyclone lingered for two days, before weakening back to a low-pressure area and dissipating on 13 December. Together with the South Atlantic Convergence Zone (SACZ), Ubá caused heavy rains in Minas Gerais, in Espírito Santo and mainly in Bahia. The storm became the deadliest South Atlantic (sub)tropical cyclone, with a death toll of 15.

Subtropical Storm Ubá
Subtropical storm Ubá off the coast of southern Brazil on 10 December
Meteorological history
Formed9 December 2021
Dissipated12 December 2021
Subtropical storm
1-minute sustained (SSHWS)
Highest winds65 km/h (40 mph)
Lowest pressure997 hPa (mbar); 29.44 inHg
Overall effects
Fatalities15
DamageUnknown
Areas affectedArgentina, Brazil (Bahia, Espírito Santo, Minas Gerais, Paraná, Rio de Janeiro, Rio Grande do Sul, Santa Catarina and São Paulo) and Uruguay
Part of the 2021–22 South Atlantic cyclone season

Meteorological history
Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

The low-pressure system formed off the coast of Rio de Janeiro and evolved into a subtropical cyclone. The low caused, along with the South Atlantic Convergence Zone, heavy rains in Minas Gerais, in Espírito Santo and mainly in Bahia where very high volumes of precipitation were recorded in the city of Itamaraju, measuring 527 millimeters (20.7 in).[2] More than 30 municipalities in Bahia decreed state of emergency because of heavy rains and ten people died in the state.[3]

On 10 December, the cyclone evolved and gave rise to a subtropical depression on the coast of southern Brazil, according to a synoptic chart from the Brazilian Navy. In the morning of the same day, according to the CHM, the system evolved into a subtropical storm and was named Ubá.[4]

On 12 December, the system was lowered to a subtropical depression upon exiting METAREA V and a day later, encountering cooler waters and of wind shear, it was lowered again to a low pressure common at sea.[5]

Impact

Floods in Minas Gerais

In the Jequitinhonha Valley, in Minas Gerais, the rain caused by ZCAS and this subtropical cyclone caused flooding, with the Jucuruçu River overflowing. Another 5 deaths from these systems were reported.,[6] a dam overflowed in Crisólita[7] and in the city of Monte Formoso, were registered 331 millimeters (13 in). 31 cities in Minas Gerais were in a state of emergency.[8]

Floods in southern Bahia

The floods in southern Bahia began on 7 December 2021, with heavy rains that hit the region. Among the most affected cities in south of the state are Itamaraju, Eunápolis and Itabela, where a strong rise in river levels and slides of land. Other cities are also being affected, requiring air assistance to rescue and supply basic items. In Ilhéus, the pool of a luxury resort overflowed, and some guests had to be transferred to another hotel [9] The government of Bahia decreed an emergency situation in 24 municipalities on the 9th. News of deaths and disappearances circulated in the media, more than a thousand displaced people are estimated.[10]

See also

References
  1. NACHTIGALL, LUIZ F. "Enorme ciclone na costa do Sul do Brasil vira tempestade subtropical Ubá". MetSul (in Brazilian Portuguese). MetSul Meteorology. Archived from the original on 10 December 2021. Retrieved 10 December 2021.
  2. "Entenda porque choveu tanto sobre a Bahia". Terra (in Brazilian Portuguese). 10 December 2021. Archived from the original on 11 December 2021. Retrieved 14 December 2021.
  3. "Governo atualiza número de mortes e de pessoas atingidas na Bahia". CNN Brasil (in Brazilian Portuguese). WarnerMedia. 13 December 2021. Archived from the original on 13 December 2021. Retrieved 14 December 2021.
  4. NACHTIGALL, LUIZ F. "Ciclone se forma na costa do Sul do Brasil e provoca calamidade na Bahia". MetSul (in Brazilian Portuguese). Archived from the original on 10 December 2021. Retrieved 14 December 2021.
  5. "Cartas Sinóticas | Centro de Hidrografia da Marinha". marinha.mil.br. Archived from the original on 14 December 2021. Retrieved 15 December 2021.
  6. Jornal Nacional (11 December 2021). "Chuva deixa mortos e milhares de desabrigados em Minas Gerais". G1 (in Brazilian Portuguese). Archived from the original on 13 December 2021. Retrieved 14 December 2021.
  7. Pimentel, Thais (11 December 2021). "Em 24 horas, número de desabrigados pela chuva aumenta quase cinco vezes em MG". G1 (in Brazilian Portuguese). Archived from the original on 11 December 2021. Retrieved 12 December 2021.
  8. "Incomum combinação trouxe chuva extrema na Bahia e Minas Gerais". MetSul Meteorologia (in Brazilian Portuguese). 12 December 2021. Archived from the original on 12 December 2021. Retrieved 12 December 2021.
  9. "Chuva na Bahia: resort de luxo fica alagado em Ilhéus; hóspedes ilhados foram transferidos para outro hotel". G1 (in Brazilian Portuguese). 10 December 2021. Archived from the original on 12 December 2021. Retrieved 14 December 2021.
  10. "Inundações no Sul da Bahia deixam vítimas e casas submersas; Governo decreta emergência". Diário do Nordeste. 10 December 2021. Archived from the original on 10 December 2021. Retrieved 10 December 2021.
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