South American weather is bringing back memories of last year's production losses and raising the chances that there could be similar unexpected demand thrust upon U.S. soybeans and corn once again this year.The soybean market has been on edge for some time over the possibility that adverse weather might cut into production of the recently-planted soybean crop in Brazil and Argentina. Long-term model guidance indicated that weather conditions for northern Brazil would be drier than normal and might possibly turn into a drought. It was already dry in southern Brazil and northern Argentina while central Argentina was wet enough that planting might be delayed.Some weather problems have developed, however, but not quite as had been earlier fear...