A cold front is likely to push through most of the corn-growing region within the next 4-5 days. As high pressure currently over the Great Lakes region moves off to the east, southerly winds to the east of the cold front may allow some isolated corn earworm flights to occur across much of the northern corn-growing region where some crops may still be at a stage where damage could occur. The risk is initially located across Nebraska and South Dakota later this evening and into early tomorrow morning, but then spreads east into Minnesota, Wisconsin, Iowa, and Illinois by Saturday night and Sunday morning as the cold front moves east. The Low risk area advances eastward into the Great Lakes region by Sunday night and Monday morning where some scattered showers and storms in conjunction with south to southwest winds may result in some moth flights into this area.
By next week, wind flow is expected to lessen so no additional risks are in the forecast at this time.