Heading into the spring planting season, weather is starting to become at least interesting across the Northern Hemisphere. The U.S. winter wheat crop is growing, which can make it very susceptible to even a normal frost date. Does this have implications for summer weather problems?This week’s March WASDE did nothing to change the momentum of grain and oilseed markets. As everyone expected, it contained no significant changes from the February numbers. There aren’t many changes to make in February and March unless Southern Hemisphere weather really becomes a problem, and that didn’t happen this year. Now it is a matter of waiting for the 31 March quarterly stocks and planting intentions estimates. Quarterly stocks aren’t interesting any mor...