Tokyo residents woke up on the morning of February 3, probably feeling like they were in a horror movie, as a thick fog which started the night before surrounded the region. The Japan Meteorological Agency issued a dense fog advisory, an extremely rare occurrence according to the agency, as the region is now in the throes of winter.
The fog warning, the first one since May of 2013, was issued in Tokyo, Kanagawa Prefecture and other areas in the southern Kanto region. It affected transportation services, temporarily suspending trains on the Tokyu Den-en-toshi Line and delaying the services of the JR Tokaido, Yokohama, Sagami and Negishi lines and also the Odakyu Odawara and Enoshima lines. The lowest temperature experienced by the city while the fog was up was at 7 degrees Celsius.
Tokyo normally experiences fog just a few times a year, usually during the spring and fall seasons. This time around, the JMA said that a warm, moist atmosphere that came from the ocean created the fog when the temperature further dropped on the evening of February 2. Initially, there were fears that the fog was actually the haze or toxic cloud from China, that has been feared will spread throughout the region, particularly in Western Japan. The smog is a result of the increasing number of vehicles as well as other air and industrial pollutants in China. But this particular fog incident was nothing but a strange weather occurrence.