A transition to broad southwesterly flow is expected across the corn-growing region for late this week into the holiday weekend. The result will be nightly black cutworm migration risks, although with rather weak flow overall, only Low risks are in the forecast for the risk of mainly isolated moth flights. There could be a window of opportunity for slightly higher risks ahead of a cold front late in the weekend or on the Memorial Day holiday itself, but confidence is not high enough at this time to introduce an elevated risk. Low migration risks focus mainly west of I-35 tonight into tomorrow before expanding east into the US 51 corridor in Wisconsin and Illinois tomorrow night into Friday. Virtually the whole of the corn-growing region is included in a Low risk over the weekend, with the primary focus by Sunday night into Monday mainly along and east of the Mississippi River as a cold front begins moving southeast. Growers with newly emerged corn should continue to scout regularly as larvae from previous moth flights may now be present in some areas.