A favorable weather pattern for a late-season corn earworm migration event is expected this weekend, with Moderate migration risks in the forecast across processing and fresh market fields in the northern corn-growing region tomorrow night into Sunday. First of all, Low risks are predicted tonight into tomorrow from Nebraska, Iowa, and southeast Minnesota as far east as southwest lower Michigan and northern Indiana. As a cold front moves southeast tomorrow, however, a more classic setup for southerly winds ahead of the front and potential precipitation comes into play, and Moderate risks are predicted across portions of Iowa, Minnesota, Wisconsin, Illinois, Indiana, Michigan, and Ohio. Low risks extend all the way east into southern Ontario, Canada and Ohio. By next week, another weather system is expected to develop in the Plains and return southerly winds to areas west of the Great Lakes by Monday into Tuesday, so Low risks are back in place then but the setup next week does not look quite as favorable or as long of a duration as the present, ongoing event. Processors and fresh market growers are encouraged to continue checking traps regularly and scouting vulnerable fields until harvest.