Northern Hemisphere where the large landmasses of Eurasia and North America markedly protrude into the high latitudes. It is here that the seasonal cooling will be most extreme, rather than over the more northerly Arctic Ocean with its floating polar icecap . As a result, the Polar High in the Northern Hemisphere is actually two separate cells, a weaker cell centered above northwestern Canada (the Canadian High) and a much more powerful cell covering all of northern Asia (the Siberian High). Note, however, these features are evident only during the of the dominance of the Antarctic landmass in the high latitudes, the model’s single cell of high pressure over the pole is reasonably accurate.