Overcast or overcast weather, as defined by the World Meteorological Organization, is the meteorological condition of clouds obscuring all of the sky. Overcast, written as "OVC" in the METAR observation, is reported when the cloud cover is observed to equal eight oktas (eighths).
Sometimes clouds can be different colors such as black or white, but the word usually refers to grey.[citation needed] In some cases, it can be impossible to see distinct borders of clouds or the sky may be covered by a single type of cloud, such as stratus and the whole sky will be a dull white.
Periods of overcast weather can range from a few hours to several days. Overcast weather can also affect people suffering from seasonal affective disorder.
The same weather, when observed by pilots, might be referred to as (an) undercast.[citation needed]
Tempozan Ferris Wheel is located in Osaka, Japan, at Tempozan Harbor Village, next to Osaka Aquarium Kaiyukan, one of the largest aquariums in the world. The wheel has a height of 112.5 metres (369 ft) and diameter of 100 metres (330 ft).
Tempozan Ferris Wheel opened to the public on July 12, 1997. During the 17-minute ride (¥700), it offers a view of Osaka Bay and surrounding areas, such as Mount Ikoma to the east, Akashi Kaikyō Bridge to the west, Kansai International Airport to the south, and Rokko Mountains to the north.
The wheel has colored lights that provide a weather forecast for the next day. Orange lights indicate a sunny day, green lights a cloudy day and blue lights indicate rain.
The Daikanransha Ferris wheel at Palette Town in Odaiba, Tokyo, which opened in 1999, has the same diameter as Tempozan, but 2.5 meters more in total height. Sky Dream Fukuoka opened in 2002 and has a diameter of 112 meters and a total height of 120 meters, but ceased operating in September 2009. Diamond and Flower Ferris Wheel of Kasai Rinkai Park, east of Tokyo, opened in 2001, and has an 111 meters diameter and 117 meter height.