Much of the corn-growing region is predicted to return to northwest flow for the balance of this week. As a result, no risk of corn earworm migration is predicted as any southerly winds will likely be confined to areas outside of the corn-growing region or far western Plains states. By late in the weekend, however, high pressure should move far enough east and low pressure is predicted to develop and deepen across the northern Plains states and into south central Canada. The pressure gradient between these two features is likely to result in at least modest south to southwest winds which may lead to some isolated moth flights into especially the upper Midwest. There are still fields at vulnerable stages of growth at this time – most notably in the fresh market and processing side of production, and these growers should continue to monitor traps and field activity as we move into the late weekend and especially next week when the weather pattern could turn active once again. For now, Low risks are in place Sunday night into Monday generally along and west of Lake Michigan and I-55.