Corn earworm migration risks will be on the increase over the next five days with an active southwest flow weather pattern in place as well as actively moving corn earworm moth populations across portions of the corn-growing region. Low risks are in place tonight into Friday morning especially along and west of a line from southeast Missouri into north central Illinois and southwest Wisconsin. Primarily isolated corn earworm moth flights are predicted to continue across this region as low pressure continues to organize east of the Rocky Mountains and high pressure slides back into the southeastern United States which will allow south to southwest winds to return to the risk area. A more widespread migration risk is predicted for the weekend and into early next week along and ahead of a cold frontal passage that is currently expected to pass through the corn-growing region starting Sunday in the northwest and through the Ohio River valley by next Tuesday. Low migration risks encompass much of the corn-growing region already by Friday night into Saturday followed by Moderate risks from northeast Kansas into northern Missouri, much of Iowa, southeast Minnesota, central and southern Wisconsin, central and northern Illinois and Indiana, lower Michigan, far southwest Ontario, Canada, and Ohio by late in the weekend and early next week as the cold front moves southeast. Not only are corn earworm moth populations active in the mid-south and southern states, but additional moth populations are currently moving through portions of Illinois and surrounding states. Growers in the upper Midwest, notably in eastern Minnesota, Wisconsin, and Michigan, should be on the lookout for new or additional corn earworm moths especially later this weekend and next week as the moth flight continues to move north on favorable weather conditions.