Low corn earworm migration risks are predicted for areas especially east of I-57 and south of I-94, or from eastern Illinois into Indiana and Ohio and from southern Michigan to the south this evening into early Tuesday morning. A cold front will push through the central corn-growing region today and into the eastern Midwest/Great Lakes region by Tuesday. High pressure briefly builds into the Plains and Midwest during the day Tuesday so no migration risk is predicted tomorrow.
Low corn earworm migration risks return by the extended forecasting period as south to southwest winds originating in western Texas and the Oklahoma/Texas panhandles begin to blow north into the Plains and especially the central and southern corn-growing regions. Hot/humid weather should return for a few days across this region but overall wind flow is not expected to be particularly strong and the source region is not an optimal area for larger scale CEW moth migrations to the north. Thus, only Low risks are in place initially across the Plains and western Midwest by Wednesday night into Thursday morning before expanding east and southeast by the end of the week as a cold front slowly pushes southeast.