As temperatures tumble in the months of November and December, ice quickly forms across many bodies of water in the Northern Hemisphere. All of us have seen it take shape on a small scale, like your backyard pond or the lake you drive passed everyday on the way to work. But what about on a much larger scale?? Well, there is a way you can see that. NOAA (The National Oceanic and Atmospheric Administration) keeps permanent eyes fixated on the growing and shrinking of ice and snow pack across North American and the Arctic regions. Here you can view a 31 day loop of sea ice forming, snow pack changes, and large lakes freezing over. The yellow areas are sea ice, the white indicates areas that are snow covered, the blue is open ocean, and the green is land that isn't covered in snow. Watch the loops and take notice of the large lakes in northern Canada freezing and also how the Hudson bay goes from nearly no ice, to completely ice covered.
31-Day Alaska Snow Loop: http://www.natice.noaa.gov/ims/loop/ak-1mo-loop.html
31-Day US Snow Loop: http://www.natice.noaa.gov/ims/loop/usa-1mo-loop.html