The National Institute of Meteorology (Inmet) issued a "great danger" alert for Rio Grande do Sul due to predicted intense rainfall [1, 2].

This warning comes as the region faces the threat of an extratropical cyclone, which could trigger catastrophic flooding and landslides in vulnerable areas [2, 3].

According to Inmet, daily rainfall may exceed 100 mm [1]. The agency said that such volumes increase the risk of river overflows and slope failures, conditions that often lead to significant infrastructure damage and displacement of residents [1, 2].

There are conflicting reports regarding the specific timing of the alerts. Some reports indicate the warning was issued for May 27 and 28, 2026 [1]. Other records state the alert was issued on Saturday, May 10, 2026 [2].

Inmet said the situation was an "alerta vermelho de 'Grande Perigo'" [2]. The weather system is characterized by the formation of an extratropical cyclone, which drives the heavy precipitation across the southern state [2, 3].

Local authorities are monitoring the situation as the region prepares for the potential impact of these storms. The risk remains high for areas prone to flooding, as the volume of water can quickly overwhelm drainage systems and natural waterways [1, 2].

O Globo said the south of Brazil was preparing for these possible cyclones as early as May 6, 2026 [3]. The pattern of intense rain has been a recurring concern for the region's meteorological services this year [3].

“Alerta de "grande perigo"”

The conflicting dates in the reporting suggest a period of prolonged instability or multiple weather events affecting Rio Grande do Sul throughout May 2026. The 'great danger' classification by Inmet indicates a high probability of life-threatening conditions, reflecting the region's ongoing struggle with extreme weather patterns and the volatility of extratropical cyclones.