A cold wave brought by an air mass of record-low temperatures gripped Hokkaido on Friday, causing traffic disruptions on the northernmost Japanese mainland.As temperatures plunged below minus 20 C in some parts of the region, the Japan Meteorological Agency also predicted snowfall on Saturday in eastern Japan, with central Tokyo expected to see 5 to 10 centimeters.The agency said a cold air mass of minus 24.4 C, the lowest since it began compiling data in 1957, was hovering about 1,500 meters above Sapporo, the capital of Hokkaido, where the mercury dropped to minus 12.5 C in the morning.Th…READ FULL ARTICLE