ST. LOUIS, MO (AP) -
The latest U.S. Drought Monitor map shows conditions have grown slightly worse in Iowa and Nebraska, where much of the nation's corn is grown.
The map shows the northwest corner of Iowa is now enduring an extreme drought, as are the east-central portion of the state and a section of southeast Iowa.
In a few parts of western Nebraska, the severe drought has worsened to extreme drought, with the eastern quarter remaining in severe drought. A few counties in central Nebraska continued to be listed as being under exceptional drought conditions.
The drought map is a project shared by the University of Nebraska-Lincoln, the U.S. Department of Agriculture and the National Weather Service. The latest map is based on conditions as of 6 a.m. Tuesday.
The U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought.
The map posted Thursday on the monitor's website shows that nearly two-thirds of the lower 48 states is experiencing some drought. Recent rainfall pushed the percentage down to 62.91, from last week's 63.86.
The report says one-fifth of the U.S. is experiencing extreme drought. That number ticked up nearly 2 percentage points to 22.3 percent, largely because of worsening conditions in parts of Kansas, Missouri, Nebraska and Oklahoma.
The area of the lower 48 states classified as facing exceptional drought, the most serious classification, rose from 2.38 percent last week to roughly 3 percent.
