23 Aug 2023 | 02:53 PM UTC
Brazil: Adverse weather forecast across southern regions through at least Aug. 25
Severe weather forecast over parts of southern Brazil through at least Aug. 25. Flooding, landslides, and transport disruptions possible.
Event
Heavy rainfall and strong winds are forecast across parts of southern Brazil through at least Aug. 25. Heavy downpours could trigger flooding in low-lying areas and landslides on unstable slopes. Transport disruptions and power outages are also possible in affected areas.
As of Aug. 23, Brazil's National Institute of Meteorology (Inmet) has issued orange (the middle level on a three-tier scale) storm warnings across parts of northern Rio Grande do Sul and southern Santa Catarina states through early Aug. 24. Rainfall amounts of 3-6 cm (1-2 inches) per hour or 5-10 cm (2-4 inches) of rain per day, with strong winds of 60-100 kph (37-62 mph) and hail are forecast in the warning area. Yellow storm warnings are in place for parts of central and southern Rio Grande do Sul. Further showers and storms are forecast in the region through at least Aug. 25. Officials could update and possibly extend the coverage of the relevant weather alerts over the coming days.
Hazardous Conditions
Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. In developed areas with easily overwhelmed stormwater drainage systems, additional urban flooding is also possible. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides remain possible in hilly or mountainous areas, especially where heavy rainfall has saturated the soil. Power outages and disruptions to telecommunications services are likely where significant flooding, landslides, or strong winds impact utility networks.
Transport
Floodwaters and debris flows could render some bridges, rail networks, or roadways impassable, impacting overland travel in affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.
Severe weather could also trigger intermittent flight delays and cancellations at airports in the affected regions, though these are unlikely to be severe or prolonged. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas with heavy rainfall and track inundation. Localized business disruptions may occur in low-lying areas.
Advice
Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments before travel. Make allowances for localized travel delays and potential supply chain disruptions where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in the case of prolonged electricity outages.
