A developing storm system in the Rockies and Plains states today will slowly lift northeast through the Plains and upper Midwest by the end of the extended period. After primarily light southerly winds overnight tonight and into Saturday morning that pose no risk of corn earworm migration, southerly wind speeds and coverage really increase by Saturday night into Sunday morning especially across the Plains states and western/central Corn Belt. Low corn earworm migration risks are predicted mainly south of I-80 and as far east as Indiana. As the warm front lifts north into the upper Midwest, the migration risk also expands north and eventually includes portions of Minnesota, Wisconsin, Michigan, and points to the south as south to southwest winds increase. With continued low trap counts in the source region across the mid-south and southern states and delayed planting progress across many areas, only Low corn earworm migration risks continue in the forecast despite a favorable weather pattern for potential migration events.