Weather remains the dominant driver of grain markets this time of year, but this week's trade has been a reminder that futures markets are constantly looking ahead. Corn and soybean prices don't simply react to today's weather — they respond to where traders believe production risks will be weeks or even months from now. Earlier concerns over expanding heat and dryness helped fuel one of the strongest rallies we've seen in weeks as traders added weather premium back into the market. More recently, however, that premium has begun to fade as forecast models shifted toward a less threatening outlook. A ridge of high pressure is still expected to bring hotter temperatures to portions of the Northern Plains next week, but timely rainfall a...