South to southwest winds originating in portions of Oklahoma, Arkansas, southern Kansas, and southwest Missouri are predicted to blow north into the central corn-growing region late this evening into early Friday morning. Scattered showers/storms are likely to occur along and south of a southeastward pushing cold front and may serve as a favorable region for insect drop-out. While southerly winds are not expected to be as robust as last night, the source region is in a better location with higher moth activity. Therefore, Moderate corn earworm migration risks are predicted for eastern Kansas, much of Missouri, southeast Iowa, and western/central Illinois. Low risks extend north further into Iowa and to near the Illinois/Wisconsin border and also east into Indiana.
As high pressure settles south from the northern Plains into the corn-growing region Friday into Friday night, only calm/light winds are expected so no risk is predicted.
Looking ahead to the extended time period, high pressure should slowly move off to the southeast. As a result, southerly winds will likely return initially to the Plains states and then spread east into the corn-growing region by early next week. Wind speeds look rather weak, however, so only Low risks are predicted at this time.