The weather radar is very active tonight, especially in the eastern half of the U.S.. There is a line of showers moving across Iowa along a frontal boundary that looks like it is stopping southbound migrants to it's north.
As this line of rain slides to the east it may mean a grounding of migrants behind (north) it. This may be good news for birders in southern Minnesota and Wisconsin. With the reports of heavy movements of birds in the Lake Superior region the last couple of days there may be lots to look at on Thursday morning.