Corn earworm migration probabilities are predicted to remain limited through the weekend as high pressure currently in North Dakota drops southeast into the heart of the corn-growing region. Any south winds this weekend are expected to remain in the Plains states and should be rather light so only Low risks are predicted Saturday night into Sunday morning in Kansas and Nebraska.
By next week, high pressure shifts off to the southeast and a new low pressure center develops in the northern Rockies and northwest Plains region. A respectable pressure gradient develops between the high and low pressure centers by the first of the week. As a result, south to southwest winds increase especially by Monday into Tuesday of next week. Low risks remain in the Plains Sunday night and Monday, but Moderate risks return to the forecast by Monday night and Tuesday especially from Kansas and Nebraska into western Iowa, southeast South Dakota, and southwest/southern Minnesota. Low risks expand north into North Dakota and corn-growing areas of northwest and central Minnesota in addition to southwest Wisconsin and the remainder of Iowa and also Illinois and Missouri by the middle of next week.