A cold front will continue to press southeast through much of the corn-growing region in the next 24-36 hours. As it does so, some scattered showers and storms are likely to occur along the front especially across the Great Lakes region and into the eastern Midwest and may serve as insect drop zone regions. With some south to southwest winds expected to persist south of the front, there will be an opportunity for corn earworm migration especially later this evening into early tomorrow morning from southeast Missouri into southern and eastern Illinois, Indiana, much of Ohio, and portions of Kentucky. Close proximity to an active source region has led to a Moderate risk across much of this region.
Later this week and into next weekend, a weak low pressure cell is predicted to pass from west to east right through the heart of the corn-growing region. The quick movement and weak nature of this system, however, is only expected to result in light southerly winds to its east so Low risks are in place initially in Kansas and Nebraska Wednesday night into Thursday before spreading into Iowa, Illinois, and Missouri Thursday night and Friday, and eventually into the southern Great Lakes and eastern Midwest by the end of the week and into next weekend.