The CBOT started the day on a strong note and tried to capitalize on Tuesday’s strength but faltered and ended lower after updated weather models showed meaningful rains for Argentina and southern Brazil in the next two weeks. This week remains relatively dry, but the EU and GFS models show a strong storm system moving in starting early next week and intensifying into February. That caught funds by surprise and sparked a round of position liquidation and short covering in the grain markets. Aside from the South American weather forecast, there was little fundamental news to help guide markets on Wednesday, leaving the rainy forecast to keep futures moving lower. 

Uruguay’s Agriculture Minister Fernando Mattos said the co...