Tokyo Snow seen from space.
The image above is from the MTSAT taken at 0300Z or 1200JST on Tuesday January 15th, a day after one of the worst storms to hit Tokyo in 15 years. In the zoomed in area in the top left of the page you can see the Tokyo circled. Typically this is a grayish color on a real color map but today pure white covers the city side due to the heavy snow.
Snow often falls in the city at least once a year during the mid-winter month. But a combination of factors. They were moisture from a Tropical Depression near the Philippines, a deepening trough over china supporting surface low pressure and cold air surging in out of Russia.
Currently the storm continues to push away from Japan and on the satellite imagery it is very evident it has become a monster storm with pressure down to 940hpa and winds nearing 100kts. If you were to use pressure only to compare this to a hurricane it would be a category 4 storm.