As the weather pattern across the central and eastern United States translates into a west or even northwesterly flow pattern, corn earworm migration probabilities into the corn-growing region are expected to remain rather limited due to a lack of strong southerly flow.
Low risks remain in the forecast for the next three nights as a weak area of low pressure advances east through the middle of the corn-growing region. Low level southerly winds immediately east of the low pressure center may allow a few moths to fly north on a nightly basis. The low risk area is initially in Kansas and Nebraska tonight as southerly winds begin to expand east. The risk translates east into Missouri, Iowa, and Illinois for Thursday night, and finally into the eastern Midwest Friday night. An additional Low risk area is predicted in northern Kansas and Nebraska as another weak low pressure center moves through the northern Plains Friday night as well.