Japan: High temperatures forecast to persist across much of the country through at least July 29 /update 1

Forecast models indicate that high temperatures will persist across much of Japan through at least July 29. Temperatures in excess of 38 C (100 F) have been recorded in part of Kanto and Tokai regions in recent days and the excessive heat is expected to continue over the coming days. As of July 23, the Japan Meteorological Agency (JMA) has issued a weather bulletin advising that high temperatures are expected across eastern and western Japan through at least July 29, with temperatures of more than 35 C (95 F) forecast in some areas. Heatstroke alerts have been issued for 41 prefectures across Japan July 23 and 18 prefectures July 24. Officials could upgrade, rescind, or expand the coverage of alerts over the coming days as conditions change.

The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the region. Heatwaves also threaten vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion during prolonged exposure to high temperatures. These health risks could also affect relatively healthy individuals during significant heatwave events.

High temperatures could warp rail tracks and force passenger and freight trains to operate at reduced speeds. Damage to road surfaces is also possible, and overheated vehicles could worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur, as very high temperatures put more stress on vehicles and make tire blowouts more common. Major flight disruptions are unlikely at regional airports; however, general aviation disruptions are possible, and some air freight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.