The U.S. Drought Monitor survey is showing worsening drought conditions in Missouri, Kansas, Nebraska and Oklahoma, but slight improvements elsewhere.

The latest 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 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.