Corn earworm migration risks will continue especially for the next two nights as a cold front slowly passes southeast through the corn growing region. High pressure in the southeast United States and a cold front advancing southeast across the upper Midwest into the Plains will result in south to southwest winds originating in the mid-south to blow north northeast the next couple nights. Moderate corn earworm risks are in place from eastern Kansas and Missouri northeast into far southeast Nebraska, Iowa, and northwest/western Illinois tonight into early tomorrow morning. The Moderate risk shifts slightly south Thursday night with areas mainly south of US 34 and between US 81 and US 51 at risk.
Looking ahead to the extended period, high pressure once again builds into the central part of the country and should result in heat/humidity expanding once again across much of the corn-growing region. Any southerly winds during this time period at least will be focused out in the Plains states. Only a Low risk is in place at this time due to relatively weak winds and lack of expected widespread precipitation.