By Adam Douty, Meteorologist
September 30,2014; 8:44PM,EDT
Through Wednesday, a series of low pressure systems will traverse central South America bringing locally flooding rainfall to southeastern Brazil, northeastern Argentina and eastern Paraguay.
Low pressure brought downpours Sunday night and Monday to far-southeastern Paraguay, the Brazilian state of Rio Grande do Sul and the Argentinian province of Misiones. Rainfall has already averaged 25-50 millimeters (1-2 inches) in these areas with localized amounts over 125 millimeters (5 inches).
This first wave of heavy rainfall shifted to the north on Monday causing showers and thunderstorms to spread into Florianopolis and Curitiba. The downpours resulted in some localized flooding, but not the widespread problems which are expected to continue farther south.
The second in a series of low pressure systems will enhance rainfall once again on Tuesday from far-southeastern Paraguay into Rio Grande do Sul. Additional rainfall of 25-75 millimeters (1-3 inches) is expected with this second round of rainfall.
Localized rainfall amounts can exceed 150 millimeters (6 inches) through Wednesday from southeastern Paraguay into Rio Grande do Sul, Brazil.
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Because the ground will already be saturated from the first round of rain, additional heavy rain could lead to more widespread flooding concerns.
So far this September, rainfall across the region has been above average with some areas receiving twice their normal rainfall.
By Wednesday, high pressure begins to build across eastern Argentina which will bring heavy rainfall to an end, but a few showers and thunderstorms will still remain. More widespread dry conditions are expected on Thursday.
Meteorologist Eric Leister contributed to this story.
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