A seasonably deep area of low pressure currently over Michigan in combination with high pressure over the Plains results in no corn earworm migration risks through Saturday morning.
Thereafter, a familiar weather pattern for this summer featuring high pressure in the southeast United States and low pressure in the central Plains with a warm front positioned from west to east likely somewhere between I-70 and I-80 is expected to develop. South to southwest winds originating from source regions in northern Texas, Louisiana, Arkansas, and Oklahoma will blow north and northeast starting especially Saturday night and continue through the remainder of the extended period into the middle of next week. Showers and storms moving from west to east along the warm front could result in a region for isolated insect drop zones. A Low corn earworm migration risk is in place initially from Nebraska and Iowa southward but the risk expands to as far east as Indiana by Sunday night/Monday morning and potentially into Ohio and points southwest by Monday night and Tuesday morning.