By Eric Leister, Meteorologist
December 18,2014; 6:16PM,EST
Heat will build across northern Argentina, Uruguay, southern Brazil and Paraguay the next few days, setting the stage for a powerful cold front to bring much cooler air, flooding downpours and locally strong thunderstorms this weekend.
Temperatures will climb into the low to mid-30s C (88-94 F) on Friday in Buenos Aires, Argentina, and Montevideo, Uruguay. The heat will peak in Porto Alegre, Brazil, and Asuncion, Paraguay, on Saturday.
Temperatures will fall dramatically behind the cold front as it lifts northward Friday through Sunday. Temperatures are expected to be 6-12 C (10-20 F) cooler behind the front across the entire region.
The front will first spark showers and thunderstorms, a few of which will become strong, across northern Argentina late Friday night through Saturday. This includes Buenos Aires, Cordoba and Rosario.
As the front moves farther north Saturday through Sunday, thunderstorms will bring the threat of widespread heavy rainfall which may produce flooding from far northern Argentina into eastern Paraguay, northern Uruguay and southeastern Brazil.
Major cities that may experience flooding include Asuncion in Paraguay, Posadas in Argentina and Porto Alegre in Brazil.
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The threat of flooding will be highest in communities that have recently been drenched by thunderstorms.
Rainfall totals of 50-100 mm (2-4 inches) are expected this weekend along with locally severe thunderstorms that can produce damaging winds and hail.
As this front moves to the north, high pressure will build into Argentina to provide a stretch of dry weather that will last from Monday through Friday. A passing shower will make Buenos Aires and
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