Corn earworm migration risks will be on the increase as we head into the weekend. Southerly winds are expected to increase in a rather stagnant zonal to southwesterly flow weather pattern across especially the western half of the corn-growing region, and may lead to some scattered moth flights. Low risks are in place tonight mainly west of Lake Michigan and generally along/south of I-90, but Moderate risks enter the picture tomorrow night into Saturday morning from eastern Nebraska into Iowa, southern Minnesota, southwest Wisconsin, and northwest Illinois with Low risks as far east as southwest lower Michigan and northern Indiana. The Moderate risk remains in the forecast Saturday night into Sunday across virtually the same region as the night before but just a little further east with Low risks extending into the I-75 corridor in southeast Michigan and western Ohio. There is some uncertainty later in the period as a potential Gulf of Mexico tropical storm or hurricane may influence the eastward progression of a cold front by the end of the weekend especially as it makes landfall somewhere in the southern United States so this will need to be monitored.