A cold front is pushing southeast through the southern Great Lakes and Illinois River valley this morning. Northwest winds will increase behind this front and essentially greatly limit any corn earworm migration risk tonight into tomorrow. By later tomorrow and into the weekend, however, southerly winds and increasingly hot and humid conditions will return to at least a portion of the corn-growing region. These southerly winds may also pose a corn earworm migration risk. Low migration risks are predicted tomorrow night into Saturday mainly west of a line from Springfield, Missouri to Wausau, Wisconsin, with the risk then spreading east into the Great Lakes and a portion of the eastern corn-growing region later Saturday and into early next week. There are still some uncertainties with greatest placement and expected winds early next week as a cold front may impact a portion of the region, so risks are being kept in the Low category for now. Growers with later planted fresh market and processing crops, however, should monitor traps and scout fields as new moth flights may occur in the next week.