A strong cold front is expected to traverse the entire corn-growing region from west to east over the next 48 hours or so. Ahead of the front, southerly winds will increase and may pose at least an isolated corn earworm migration risk especially in the few hundred miles before the front and its associated precipitation. Low risks are in place tonight into tomorrow morning from far northeast Nebraska into northern Iowa, southern Minnesota, southern Wisconsin, and northern Illinois. As the front moves southeast, the risk shifts with it for tomorrow night into Friday morning, and includes eastern Iowa, southeastern Wisconsin, northern Illinois, northern Indiana, northern Ohio, lower Michigan, and into southern Ontario, Canada. No further risks are being issued after midday Friday as it appears any southerly flow will be directed outside of the corn-growing region and much cooler temperatures are likely to make an appearance.