By Evan Duffey, Meteorologist
July 19,2015; 9:50PM,EDT
A front lifting through eastern South America threatens to bring flooding from northeastern Argentina to southeastern Brazil into early this week.
A slow-moving cold front tracking north in the region will be the instigator, bringing major changes from Argentina to southern Brazil. Showers and thunderstorms concentrated along that front will train and move little, bringing the potential for a significant amount of rain in a short period of time.
The front will reach peak intensity across far northeastern Argentina and southeastern Brazil. Rainfall amounts there are expected to be between 50-100 mm (2-4 inches), bringing the greatest risk of flash flooding along the path of the front.
AccuWeather.com Meteorologist Anthony Sagliani says the worst flooding is expected in Rio Grande Do Sul, and that in particular low lying and poor drainage areas are of the most concern. According to him "The slow-moving nature of the front really opens up the possibility to overwhelm some of these poor drainage areas, where rain will outpace efforts to remove it."
On Tuesday low pressure forming along the front will work to pull it offshore, bringing an end to the heavy rain threat, but showers will linger across Rio Grande du Sol. Showers and thunderstorms will also expand further to the north across Santa Catarina, Parana and Sao Paulo.
By Wednesday high pressure will have returned to the region, bringing back settled weather.
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Behind the front, cooler conditions can be expected early this week, especially across northern Argentina and Uruguay. Warm conditions will wait until midweek to return.
Contributions by Meteorologist Adam Douty
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