Winds reaching 60 kilometers per hour, hail, and up to 50 millimeters of rain
Às vésperas de uma virada climática, o Instituto Nacional de Meteorologia emitiu um alerta amarelo para a região metropolitana de São Paulo, válido até a madrugada de 21 de agosto, sinalizando que ventos de até 60 km/h, granizo e chuvas intensas podem interromper brevemente o ritmo cotidiano da maior metrópole do país. O alerta, o primeiro degrau de um sistema de três níveis, não anuncia catástrofe, mas convida à atenção — lembrando que a natureza, mesmo em seu registro mais moderado, exige respeito e preparo.
- Uma frente de tempestades com granizo e rajadas de até 60 km/h avança sobre São Paulo entre a manhã de quarta e a madrugada de quinta-feira.
- Quedas de árvores, interrupções no fornecimento de energia e alagamentos pontuais em áreas baixas representam riscos secundários que podem afetar o dia a dia dos moradores.
- O alerta amarelo — nível de atenção, não de emergência — indica que a situação é séria o suficiente para mobilizar cuidados, mas ainda distante do estágio crítico.
- Autoridades orientam a população a manter em mãos os números da Defesa Civil (199), do Corpo de Bombeiros (193) e da CEMIG (116) para acionar socorro imediato caso as condições se agravem.
O Instituto Nacional de Meteorologia emitiu na quarta-feira um alerta amarelo de tempestade para São Paulo e sua região metropolitana, com vigência das 3h do dia 20 até as 3h do dia 21 de agosto. A previsão aponta para ventos de até 60 km/h, ocorrência de granizo e acúmulo de chuva de até 50 milímetros em 24 horas.
O sistema de alertas do instituto é dividido em três graus — amarelo, laranja e vermelho —, sendo o amarelo o de menor gravidade. Ainda assim, o nível indica risco real: quedas de energia, danos a plantações, alagamentos isolados e queda de árvores figuram entre as consequências possíveis, embora a probabilidade seja classificada como baixa.
A área de abrangência inclui a capital paulista e os municípios do entorno, e a recomendação às autoridades é que os moradores acompanhem as atualizações meteorológicas ao longo do período. Em caso de emergência, a Defesa Civil atende pelo 199 e o Corpo de Bombeiros pelo 193; problemas na rede elétrica devem ser comunicados à CEMIG pelo número 116.
Brazil's National Meteorology Institute issued a yellow-level weather alert Wednesday for São Paulo and its surrounding metropolitan region, warning residents to prepare for severe thunderstorms expected to sweep through between Wednesday morning and Thursday morning. The alert, which took effect at 3 a.m. on August 20 and remains in force until 3 a.m. on August 21, flags the potential for damaging winds reaching 60 kilometers per hour, hail, and rainfall accumulating up to 50 millimeters in a single day.
The institute operates a three-tier alert system to communicate weather hazards to the public. Yellow represents potential danger—the lowest of the three levels, followed by orange for danger and red for severe danger. This particular alert sits at that first threshold, meaning the conditions are serious enough to warrant attention but not yet at the most critical stage.
While the primary threats center on wind and hail, the meteorological service notes that secondary risks exist but remain relatively low. Power outages could occur if wind brings down lines or trees. Agricultural areas may see crop damage. Isolated flooding is possible in low-lying areas. Tree falls, always a hazard during severe weather, represent another potential consequence residents should keep in mind.
The alert covers São Paulo city and the broader metropolitan area surrounding it, though the institute's public advisory did not enumerate every municipality expected to be affected. Anyone in the region should monitor local weather updates as the storm system approaches and moves through.
For those facing emergencies during the storm, Brazil's Civil Defense can be reached at 199, while the Fire Department operates the emergency line 193. These agencies coordinate response to weather-related incidents and can provide real-time guidance if conditions deteriorate. For problems specific to electrical infrastructure—downed power lines, fallen poles, or service interruptions—residents should contact CEMIG, the state's primary utility company, at 116. Having these numbers readily available before the storm arrives is prudent preparation.
Notable Quotes
The institute alerts for rainfall of up to 50 millimeters per day and intense winds of up to 60 kilometers per hour, with a low risk of power cuts, crop damage, tree falls, and flooding.— National Meteorology Institute (INMET)
The Hearth Conversation Another angle on the story
Why does the institute use a color-coded system instead of just saying how bad the storm will be?
The colors let people instantly understand the severity without reading details. Yellow means "pay attention and prepare." Orange means "this is dangerous, take precautions." Red means "this is life-threatening, take shelter." It's faster than numbers.
Fifty millimeters of rain in a day—is that a lot?
It's substantial. That's roughly two inches. In a single day, it can overwhelm drainage systems, especially in older urban areas with poor infrastructure. Combined with wind and hail, it creates the conditions for flooding.
The alert says there's a "low risk" of power outages and flooding. So why issue the alert at all?
Because low risk isn't no risk. Sixty-kilometer-per-hour winds can snap branches and topple trees onto power lines. Even a low probability of outages affecting thousands of people matters enough to warn them. You want people ready, not surprised.
What should someone actually do when they see this alert?
Secure loose outdoor items. Charge phones and devices. Know where your flashlights are. Keep emergency numbers handy. Don't go out unnecessarily during the worst of it. It's not evacuation-level, but it's "take this seriously" level.
Why does the article mention contacting CEMIG specifically about power problems?
Because CEMIG manages the electrical grid in São Paulo. If a line goes down or a pole falls, they're the ones who fix it and who need to know about it. Calling them directly gets the problem into their system faster than going through other channels.