Low pressure with an attendant cold front is likely to deepen across portions of the upper Mississippi River valley especially late tonight into tomorrow and tomorrow night. Southerly winds will eventually increase to the east of the front, and may pose a Low corn earworm migration risk especially along and east of I-55 in central to northeast Illinois and points east tomorrow night into Friday morning. Fields from central/eastern Illinois into Indiana, Ohio, southern lower Michigan, and far southwest Ontario, Canada will all be at risk of seeing some moth flights during this rather brief window of opportunity. Another Low risk is in the forecast from far northeast Kansas and northern Missouri into Iowa, southern Minnesota, southwest Wisconsin, and the western half of Illinois Saturday night into Sunday morning as another low pressure system develops across the central Plains region. Otherwise, no other risks are in the forecast as the overall weather pattern remains northwest flow dominant.