A west to northwest flow weather pattern is expected to continue to build across the central and eastern portion of the United States as well as southern Canada over the next week. As a result, southerly wind flow will be more limited and corn earworm migration prospects greatly reduced across the corn-growing region through the middle of next week.
A weak weather disturbance will pass from west to east through the corn-growing region over the next couple days. Rather weak and limited coverage southerly winds will be present immediately east of this feature and a Low corn earworm migration risk is predicted from Missouri into portions of Iowa and Illinois overnight tonight for the potential of a few isolated moth flights into this area. Low risks focus back in the Plains for Friday night and Saturday as another weak area of low pressure drops southeast from the northern Rockies into the Plains. As this low moves east through the upper Midwest this weekend, Low risks expand east into portions of eastern Kansas, Missouri, Iowa, southeast Minnesota, Wisconsin, and Illinois for Saturday night and early Sunday morning. No risk is predicted thereafter as northwest winds and noticeably cooler and drier weather move into much of the corn-growing region next week.