Across the Corn Belt, showers and thunderstorms extend from the Great Lakes region into the middle Missouri Valley. Cooler air is overspreading the upper Midwest, but very warm weather in the Soft Red winter wheat belt favors crop development. By April 4, two percent of the winter wheat in Illinois had headed. Tuesday’s high temperatures will approach or reach 80° from the middle Mississippi Valley into the Ohio Valley.
On the Plains, a low-pressure system emerging from the Rockies separates lingering warmth across the southeastern half of the region from cooler conditions farther north.
