Japan experienced wintry weather Friday with Tokyo seeing its coldest temperature for mid-April since 1961, the Japan Meteorological Agency said.
At midday, the temperature in Tokyo was 7 degrees. In Miyazaki, the mercury got no higher than 9.5 degrees, the coldest mid-April temperature in 100 years. Osaka recorded 6.3 degrees early Friday morning.
The weather agency said a spate of clashes between cold air in the north and warm air in the south has brought about a big temperature variation to the Japanese archipelago this spring.
Issuing a low-temperature warning, the agency said mercury may drop around Saturday across the country, calling on farmers to pay attention to possible frost damage to crops.
The cold air mass in the north is apparently linked with the Arctic oscillation, a weather pattern that regularly releases cold air from the Arctic Circle to mid-latitude areas such as Japan, weather forecasters said. Some parts of the country saw unusually heavy snowfalls the past winter due to the weather pattern.
The high-pressure zone in the south appears to be linked with the so-called El-Nino climate pattern that causes weather disturbances such as floods and droughts.
The clash between cold air and warm air over the archipelago brought stormy weather to Hokkaido in northern Japan and the Tohoku region in northeastern Japan earlier this week, with gusts of up to 111 kilometers per hour observed in Sapporo on Tuesday.