A slow-moving upper level low pressure system is expected to impact the corn-growing region over the next five days or so, potentially longer. A cold front is expected to trail south of this low and will be the dividing line between somewhat weak southerly winds to its east and north to northwest winds to the west. Given the expected overall weaker southerly winds to the east, corn earworm migration risks are being kept in the Low category beginning tomorrow night into Friday mainly west of Lake Michigan and the I-57 corridor in Illinois. As the cold front shifts to the east, the primary focus this weekend will be east of I-35 from eastern Kansas, far northwest Missouri, central Iowa, and southeast Minnesota and points east. Growers with crops at susceptible stages to corn earworm damage are encouraged to continue monitoring traps and scouting fields until the crop moves past critical stages or is harvested.