Severe weather is returning to Rio Grande do Sul, with parts of Brazil’s southernmost state facing another threat of intense thunderstorms, damaging wind, hail and torrential rainfall.
INMET’s orange-level storm warning indicates rainfall rates of 30–60 mm per hour (1.18–2.36 inches per hour), with 24-hour totals potentially reaching 50–100 mm (1.97–3.94 inches).
Wind gusts could reach 60–100 km/h (37–62 mph), while hail is also possible.
The renewed storm threat is developing as moist air converges across southern Brazil while changes in the larger-scale weather pattern increase atmospheric instability.
Rio Grande do Sul sits in a region where tropical moisture from farther north frequently encounters cooler air moving out of higher southern latitudes.
When those contrasting air masses interact, strong temperature and moisture gradients can develop.
Disturbances moving through the atmosphere can then provide the lift required to initiate thunderstorms.
If sufficient instability develops, individual storms can produce intense rainfall, hail and powerful downdrafts.
INMET’s warning highlights gusts potentially reaching 100 km/h (62 mph).
Winds of that magnitude are capable of bringing down branches and trees, damaging weaker structures and interrupting electricity supplies.
Hail creates an additional threat to vehicles, roofs and agriculture.
Heavy rainfall could also overwhelm urban drainage where the strongest thunderstorms persist or repeatedly move across the same locations.
At rainfall rates approaching 60 mm (2.36 inches) in an hour, localized street flooding can develop quickly.
The renewed threat is particularly notable because Rio Grande do Sul has experienced repeated episodes of severe weather this winter.
Earlier storms brought destructive winds, flooding and tornado damage to parts of southern Brazil.
The August 12 episode should nevertheless be treated as a new developing severe-weather threat rather than automatically attributing previous damage to the current storms.
At the time of verification, widespread new damage associated specifically with Wednesday’s thunderstorms had not yet been firmly established.
The immediate story is therefore the atmospheric setup and official warning rather than confirmed disaster impacts.
What’s next?
Thunderstorm severity will depend heavily on where the strongest instability and low-level convergence overlap.
Severe weather is often highly localized. One municipality may experience damaging wind and hail while nearby communities receive little more than heavy rain.
Residents should therefore monitor short-term warnings as storms develop.
The combination of torrential rain, hail and wind approaching 100 km/h makes this more than an ordinary spell of wet winter weather, particularly in communities still recovering from previous severe storms.
