"During the late summer and early fall, the water level on the Great Lakes usually drops several inches. This year, three of those lakes, Superior, Michigan and Huron, have seen the opposite happen - rising water levels. Joining us to talk about why that is is Drew Gronewold. He's a hydrologist at the National Oceanic and Atmospheric Administration. He works in the Great Lakes Environmental Research Laboratory."

Audie Cornish reports for NPR's All Things Considered October 20, 2014. [2]