
AI-generated summary
Rio Grande do Sul is under meteorological alert due to the formation of an instability system that poses a risk of severe storms, with the potential for large hail and high volumes of rain.
According to Climatempo Meteorologia, the areas with the greatest potential for the occurrence of severe storms are the regions of Missões, Northwest, North, Northeast, Center and Serra. In these locations, in addition to the possibility of large hail, rainfall volumes can vary between 20 and 50 millimeters throughout the day, with occasional accumulations that can reach 90 millimeters.
The period of greatest concern occurs between dawn and morning in the northern half of the state. In the afternoon, instability should also hit areas of Campanha and the Central Region with force.
Alerts from the National Institute of Meteorology (Inmet) reinforce the scenario. The agency issued storm warnings valid throughout Friday for Rio Grande do Sul. In addition to the warning of potential danger (in yellow) for the entire state, there is a warning of danger (in orange) covering a large part of the state of Rio Grande do Sul and a warning of great danger (in red) for areas of the Serra, the Northwest and the Northeast. See map below.
After the passage of the most intense system, the scenario gradually changes on Saturday (12). The rain loses strength, but the sky remains heavy in many areas of the state. There is a possibility of drizzle and light rain, especially in the Eastern half and in the Campaign.
The highlight is the entry of a mass of cold air. Maximum temperatures are expected to be between 9°C and 19°C, while minimum temperatures predicted for the night range from 7°C to 13°C.
On Sunday (13), the action of a high pressure system should guarantee stable weather in most of Rio Grande do Sul. Dawn will be marked by more intense cold, mainly in Serra and Campanha.
The lowest temperatures predicted are 7°C in municipalities such as Pinheiro Machado, São José dos Ausentes and Cambará do Sul. During the afternoon, warming will be more significant in the Northwest, where cities like Iraí can reach 23°C.
AI outlook — possibilities, not facts
The weather should gradually improve on Saturday with the arrival of cold air masses and a reduction in the intensity of rain.
Very likely · Within days
On Sunday, a high pressure system should guarantee stable weather in most of Rio Grande do Sul, with a cold dawn and moderate warming in the afternoon.
Very likely · Within days

The advance of an extratropical cyclone keeps the weather unstable in the Center-South and increases the area that can be hit by tornadoes this Friday (11), with storm warnings for eight states and the risk of more than 100 mm of rain and winds above 100 km/h in areas of great danger.

The government of São Paulo and city halls of 11 cities in Vale do Ribeira suspended classes in the public network due to a Civil Defense alert for severe storms and a possible tornado between Friday (11) and Saturday (12), affecting regions such as Presidente Prudente, Marília, Itapeva, Sorocaba and Registro.

City halls in cities in the center-west and west of São Paulo suspended classes this Friday (11) after a Civil Defense alert for severe storms with the risk of tornadoes and microexplosions, affecting municipal, state, Etecs and Fatecs schools in regions such as Presidente Prudente, Botucatu and Marília.

Heavy rain accompanied by winds of up to 70 km/h hit Rio Claro (SP) on Thursday (10), knocking down containers in a company yard on Fausto Santomauro Highway, causing trees to fall, road closures, damage to electrical wiring, and the overturning of a truck. No one was injured. Civil Defense, Fire Department, and energy concessionaire teams are working to restore services and clear the roads.

The São Paulo Civil Defense sent a cell phone alert about strong winds and the risk of a microexplosion in Presidente Venceslau on Thursday afternoon (10), with storms, hail and possible tornadoes forecast for Friday (11) and Saturday (12) due to the influence of an extratropical cyclone from the South.

Inmet issued a yellow storm warning for 129 cities in the North, Center and Northwest regions of Minas Gerais, with a forecast of rain between 20 and 30 mm per hour, winds of 40 to 60 km/h and possible hail. The alert began at 11am on Sunday 6th and continues until 11:59pm on Friday 12th.