A 2-km resolution coupled ice-ocean ROMS simulation was run from June 2009 through July 2010. This animation shows the evolution of sea surface temperature (colors) overlaid with ice concentration (transparent-no ice, opaque white-100% coverage) between November 2009 and May 2010. Sea ice begins to develop in late November 2009 along the Alaskan and Siberian coasts, where the water column cools most quickly. As water temperatures across the Bering Sea shelf continue to cool, ice spreads over almost the entire shelf due to both wind-driven advection and local formation. A complex eddying circulation develops beneath the ice and at the ice edge on scales from 10 to 50 km, affecting scales of variability in both sea surface temperature and sea ice concentration.