ANOTHER MODEL WASTING AWAY TO NOTHING:

Antarctica's ice paradox has yet another puzzling layer. Not only is the amount of sea ice increasing each year, but an underwater robot now shows the ice is also much thicker than was previously thought, a new study reports.

The discovery adds to the ongoing mystery of Antarctica's expanding sea ice. According to climate models, the region's sea ice should be shrinking each year because of global warming. Instead, satellite observations show the ice is expanding, and the continent's sea ice has set new records for the past three winters.

The shipping season on the upper Mississippi River will end on Thursday as ice surrounding locks and dams near Minnesota's Twin Cities forced the earliest winter closure on records that date back to 1969, the U.S. Army Corps of Engineers said.

Follow @brothersjudd