A stalled frontal boundary with several areas of low pressure tracking along it brought heavy rainfall to parts of northern Argentina and Uruguay since the end of last week.
By Monday morning, rainfall had already totaled a general 75-150 mm (3-6 inches) from near Rosario, in Argentina, eastward into southern and central Uruguay.
The cities of Montevideo and Buenos Aires recorded 25-75 mm (1-3 inches) of rain during the same stretch of time.
Photo of a car driving through flood waters, courtesy of Photos.com.
Monday into Monday night, the heaviest rain fell across northwestern Uruguay where more than 100 mm (4 inches) fell around Salto.
As expected, rainfall was not as heavy or widespread on Tuesday, however scattered showers and thunderstorms did occur across the entire region. Rainfall was generally less than 6mm (0.25 of an inch).
Another wave of low pressure and frontal boundary will bring the threat for widespread heavy rainfall parts of northern Argentina on Wednesday and Wednesday night. The heavy rainfall will also spread into Uruguay Wednesday night.
This front will stall over northern Argentina and southern Uruguay through the upcoming weekend leading to rounds of rain and thunderstorms.
Additional rainfall will average 100-200 mm (4-8 inches) across the entire region, including Buenos Aires, Montevideo and Rosario, through the weekend. Local rainfall amounts of 300 mm (12 inches) or greater are possible.
Other cities in the path of the heaviest rainfall include Gualeguaychu and Salta in Argentina and Durazno in Uruguay.
The pattern will likely remain active with additional rainfall during the first half of next week.
Umbrellas and raincoats will be put to good use by those along the East Coast as rain moves in during the middle of the week.
As intense thunderstorms rattled over the San Diego area, one driver was alarmed as a falling tree slammed into his vehicle while driving along a crowded highway.
Temperatures will be on the rise across the Northeast this week and continue into the upcoming weekend.
A pattern change will usher in cooler air and rain to the Northwest this week.
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