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[INTERNATIONAL] · Brazil, Uruguay, Argentina · 57 sources

Cyclone bomb brings severe storms and high winds to southern Brazil FAST-MOVING

The Instituto Nacional de Meteorologia (INMET) is monitoring a low‑pressure system that could develop into a “cyclone bomb” over the Atlantic near the Uruguay‑Argentina border between 6 and 8 August 2026. Model projections show the central pressure may fall to about 967 hPa on 7 August and 941 hPa on 8 August, a drop of more than 24 hPa in 24 hours, meeting the definition of a cyclone bomb.

If the system intensifies, it is expected to produce intense thunderstorms, hail, and rainfall up to 200 mm in the Iguaçu basin. Wind gusts could exceed 90 km/h on land and over 100 km/h offshore, with the strongest gusts forecast for Rio Grande do Sul, Santa Catarina, Paraná and parts of Mato Grosso do Sul. INMET has issued a red alert for most of Rio Grande do Sul and orange alerts for neighboring states; the São Paulo Civil Defence has set up a crisis cabinet to monitor the event.

Authorities warn of possible tornadoes, damage to buildings, power outages, fallen trees and flooding. A cold front accompanying the cyclone is forecast to lower temperatures by 3 – 5 °C across southern Brazil. Residents are advised to follow official alerts and take precautions against strong winds and heavy rain.

Entities: Argentina · Cyclone bomb · Instituto Nacional de Meteorologia (INMET) · Mato Grosso do Sul · Micael Cecchini · Paraná · Rio Grande do Sul · Santa Catarina · São Paulo · São Paulo Civil Defence · Uruguay

Claims

What the coverage asserts, and how well corroborated each claim is across sources.

  • [● 3 SOURCES] Wind gusts over the Atlantic near the cyclone's center could exceed 100 km/h. (INMET)
  • [● 4 SOURCES] After the cyclone moves offshore, a cold front is expected to cause a temperature drop of 3 – 5 °C in Brazil's central‑south. (INMET)
  • [● 5 SOURCES] The system may form over an area covering Argentina, Uruguay, southern Brazil and the Atlantic Ocean. (INMET)
  • [● 7 SOURCES] INMET raised the alert to orange for Rio Grande do Sul and parts of Santa Catarina, Paraná and Mato Grosso do Sul. (INMET)
  • [● 8 SOURCES] INMET is monitoring a possible formation of a cyclone bomb that could affect southern Brazil between 6 August and 8 August 2026. (cd04e9e1-1b5f-4853-baff-26d801b280e0, 9668a1a5-3dd0-48f4-a422-01edc069a48d, 83616131-7f95-4115-95bb-f83048a70831, 21bf29)
  • [● 3 SOURCES] INMET issued a yellow storm warning on 5 August for Paraná, Santa Catarina, Rio Grande do Sul, parts of Mato Grosso do Sul and the São Paulo‑Paraná border. (INMET)
  • [● 5 SOURCES] The cyclone could bring severe thunderstorms, lightning, large hail and wind gusts exceeding 60 km/h in Rio Grande do Sul and Santa Catarina. (INMET)
  • [● 2 SOURCES] The Civil Defence of Rio Grande do Sul issued a cyclone alert warning of rain, hail and wind gusts over 90 km/h between 6 August and 7 August. (e63ae3a0-039b-4da3-981c-9f5676126084)
  • [● 9 SOURCES] Rainfall could reach up to 200 mm in the Iguaçu basin between 5 August and 10 August. (INMET)
  • [● 20 SOURCES] Wind gusts in Rio Grande do Sul could exceed 90 km/h, with possible gusts over 100 km/h offshore. (INMET)
  • [● 8 SOURCES] INMET issued an orange alert for Rio Grande do Sul and parts of Santa Catarina, Paraná, Mato Grosso do Sul and southern Mato Grosso do Sul. (INMET)
  • [● 8 SOURCES] A cold front associated with the system is expected to cause a temperature drop of 3 – 5 °C in southern Brazil. (INMET)

Sources

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