A webcam mounted on top of the ASRC (Arctic Slope Regional Corporation) building in Barrow, AK monitors the sea ice formation along the coast.
Images are updated every 5 minutes. You can check out the webcam webpage here.
Below is an image taken in January 2006. Can you tell where the coastline is?
Check out their webcam video (using one still a day) for the 2006-2007 sea ice season, it is pretty amazing.