Yet another active weather week is expected across much of the corn-growing region as no less than two weather systems traverse from west to east across the Plains into the Midwest. South to southwest winds will be rather persistent to the south of a warm front for the rest of today and into tomorrow morning especially from Kansas and Missouri to the south. A Low corn earworm migration risk is in place mainly from I-80 south and west of US 67 through noon Tuesday. The risk expands slightly to the north to the US 20 corridor into northeast Iowa and northern Illinois and also to the east into Indiana Tuesday night into Wednesday morning as the warm front lifts north in response to low pressure advancing east across the Plains into the lower Missouri River valley. A Low risk remains in place on Day 3 across the eastern corn-growing regions of the Midwest, especially from Illinois into Indiana, Ohio, and southern Michigan as the system departs to the east but maintains enough southerly winds in this area to continue a risk.
Focus thereafter shifts back into the Plains with the next weather system already developing in the far western Plains region. Southerly winds will likely return to especially Kansas and Missouri by that time with a warm front draped from west to east once again somewhere between I-80 and I-70. Thus, Low corn earworm migration risks are predicted from roughly I-80 south and to the west of US 51 in Illinois by late week and into next weekend.