Brazil: Adverse weather forecast across southeastern regions through at least March 24

Severe weather is forecast across parts of southeastern Brazil through at least March 24. Brazil's National Institute of Meteorology (INMET) has advised that a cold front moving across the region over the coming days could produce daily rainfall totals of more than 15 cm (6 inches) across much of Rio de Janeiro and parts of southern Espirito Santo, southern Minas Gerais, and eastern Sao Paulo states. Rainfall totals through March 24 of around 30-50 cm (12-20 inches) are possible across parts of the affected area. The heavy downpours may be accompanied by thunderstorms and winds gusting up to 90 kph (56 mph). As of early March 22, INMET has issued a red (the highest level on a three-tier scale) heavy rainfall warning across the affected area through 10:00 March 24. Officials could update and possibly extend the coverage of the relevant weather alerts over the coming days.

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.

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.