Corn earworm migration risks return to especially the western and central corn-growing region the next five days as high pressure drifts back into the southeast United States and south to southwest winds return to the Plains and Midwest. Initially, Low corn earworm migration risks are predicted tonight into tomorrow morning for Nebraska and western Iowa southward into Kansas, northwest Missouri, and far northern Oklahoma and south/southwest winds increase across this region. The risk expands northeast for Thursday night into Friday morning into the upper Midwest and the heart of the corn-growing region from Iowa into Illinois as high pressure continues to drift southeast. A Moderate risk is also predicted for northern Oklahoma, central and eastern Kansas, southeast Nebraska, northwest Missouri, and southwest Iowa where southerly winds will be maximized.
Looking ahead to the extended period, a cold front slipping to the south from the upper Midwest and Northern Plains region will slow in its progress and will eventually become stalled out somewhere between the Iowa/Missouri border and I-90. South to southwest winds will continue to feed north into the region but on a weaker scale so only Low corn earworm migration risks are predicted at this time mainly west of the Illinois/Indiana border and south of I-90 through early next week.