# CEMADEN rates flood and landslide risks high or moderate in parts of Brazil

> An October 17 outlook rated hydrological risk high near Uruguaiana because of a flood wave in the Uruguay River basin, with moderate flood and landslide risks in parts of the southeast.

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- Publisher: Newsverum
- Section: Environment
- Country: Brazil
- Published: 2026-10-18T19:46:03+00:00
- Updated: 2026-10-18T19:46:03+00:00
- Event / data period: 2026-10-17
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Brazil’s National Center for Monitoring and Early Warning of Natural Disasters (CEMADEN) rated the chance of continued hydrological events as high in the intermediate region of Uruguaiana, Rio Grande do Sul, in an assessment published on the morning of October 17, 2026. It said a flood wave in the Uruguay River basin could sustain or trigger further inundation along the main river and its tributaries.

The outlook also rated hydrological risk as moderate in specified regions of São Paulo, Rio de Janeiro, Minas Gerais and Espírito Santo because of forecast rain during the day, which could produce runoff, flooding and small-basin inundation. It assessed landslide risk as moderate in some of those states, citing rainfall over the preceding 24 hours, local susceptibility and forecast showers. These are risk assessments, not reports of events or measured losses.

## Data

### Regional geo-hydrological risk classifications

Risk categories forecast by CEMADEN for October 17, 2026; regions follow the bulletin.

Methodology: Qualitative categories transcribed from the bulletin; no probability or coordinate was inferred. Forecast risk does not establish occurrence.

| Hazard | Area named | Risk class |
|---|---|---|
| Hydrological | Intermediate Geographic Region of Uruguaiana, Rio Grande do Sul | High |
| Hydrological | São Paulo and São José dos Campos (SP); Rio de Janeiro, Volta Redonda-Barra Mansa, Petrópolis and Campos dos Goytacazes (RJ); Pouso Alegre and Juiz de Fora (MG); and southern Espírito Santo | Moderate |
| Geological mass movement | São Paulo and São José dos Campos (SP); Rio de Janeiro and Petrópolis (RJ); Juiz de Fora (MG); Cachoeiro do Itapemirim, São Mateus and Vitória (ES) | Moderate |

Sources: <https://www.gov.br/cemaden/pt-br/assuntos/riscos-geo-hidrologicos/17-10-2026-previsao-de-riscos-geo-hidrologicos-1/> · Download data: [JSON](https://newsverum.com/api/v1/articles/brazil-cemaden-flood-landslide-risk-outlook-2026-10-17/data/cemaden-regional-risk-classes-2026-10-17?lang=en&format=json) · [CSV](https://newsverum.com/api/v1/articles/brazil-cemaden-flood-landslide-risk-outlook-2026-10-17/data/cemaden-regional-risk-classes-2026-10-17?lang=en&format=csv)

## Sources

- [Brazil National Center for Monitoring and Early Warning of Natural Disasters (CEMADEN)](<https://www.gov.br/cemaden/pt-br/assuntos/riscos-geo-hidrologicos/17-10-2026-previsao-de-riscos-geo-hidrologicos-1/>) (Source checked: 2026-10-18; Published: 2026-10-17)

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