Japan Meteorological Agency issues first extreme heat warning as temperatures breach 40C

The Japan Meteorological Agency has issued its first-ever "extreme heat day" forecast for the Kanto and Tokai regions on July 22. This designation follows record-breaking temperatures exceeding 40 degrees Celsius in Gifu and Aichi prefectures on July 21, marking the first time the agency has applied this specific classification since its introduction.

The term "extreme heat day" represents a distinct threshold above the standard "hot day" metric, which is defined as a maximum temperature of 30 degrees Celsius or higher. The classification underscores the severity of the current weather patterns, with authorities urging strict vigilance against heatstroke in the affected areas.

While the central and eastern regions brace for intense heat, the weather outlook presents a contrasting scenario for northern Japan. The Japan Meteorological Agency has predicted heavy rain for the Tohoku region on the same date, highlighting the divergent weather conditions across the archipelago.

The forecast comes as part of a broader meteorological update issued on July 21. The agency’s warning system is designed to alert the public and local governments to potential health risks associated with extreme temperatures, particularly as infrastructure and public health systems respond to the sudden spike in thermal conditions.

Authorities have not yet provided specific data on the number of heatstroke cases or the long-term impact on regional infrastructure. However, the immediate focus remains on public safety, with emergency services and local councils preparing for increased demand due to the extreme weather conditions.