Corn earworm migration risks are expected to remain rather limited the next five days as the weather pattern shifts from a predominantly southwesterly flow pattern to one that is more westerly or northwesterly.
Low corn earworm migration risks remain in place across Indiana, Ohio, Kentucky, and portions of northwest and northern Tennessee as southwest winds in advance of a cold front persist the next 24 hours. Scattered showers and storms may contribute to isolated insect drop-out within the Low risk area. No risk of migration is predicted from midday Thursday through midday Sunday as southerly winds are confined to the source region as high pressure builds into the Plains and western corn-growing region.
By late in the upcoming weekend and early next week, high pressure should be far enough east to allow stronger southerly flow to return to the Plains states and western Midwest as the next low pressure system forms in the western Plains states. A Low corn earworm migration risk is introduced to the forecast for late Sunday into early Monday for areas south of I-80 and west of US 67, or from southern Nebraska and Iowa to the south and mainly west of the Mississippi River.