Rising temperatures in the U.S., recent rainfall in Argentina, and some breaks in rain for parts of Brazil are the weather factors driving the markets Wednesday.
Very cold air is forecast to move back through the middle of North America later this week, with the cold snap lasting well into February, thanks to a La Nina weather pattern. Southeastern areas of the U.S. will see less of the cold while northwestern areas should be socked in for a while. Areas in-between will waffle in and out of the colder conditions.