Days with temperatures of 40°C and above will now be branded "kokusho-bi". TOKYO: Blistering temperatures rising to 40°C and above will now be branded "cruelly hot" or "kokusho-bi" in Japan, the weather agency said on Friday (Apr 17), as heatwave days become increasingly frequent in the region. By using this designation, the Japan Meteorological Agency (JMA) "will more effectively call for vigilance against extremely high temperatures", it said. Last year, Japan sweltered through its hottest