24 Jul 2023 | 12:18 PM UTC
Japan: High temperatures forecast to persist across much of the country through at least Aug. 1
High temperatures forecast to persist across much of Japan through Aug. 1. Transport, utility disruptions possible. Health concerns likely.
Event
Forecast models indicate that high temperatures will persist across much of Japan through at least Aug. 1. As of July 24, a high-pressure system is covering a wide area from western to northern Japan, causing a rise in temperatures across much of the country. The high temperatures are expected to persist through at least the end of July, with highs of up to 37 C (99 F) forecast in parts of Chubu and Kanto Koshin regions over the coming days. Tropical nights are expected across much of the country, with minimum temperatures above 25 C (77 C) particularly likely in western Japan.
The Japan Meteorological Agency (JMA) has issued heat stroke alerts across Fukuoka, Hyogo, Ishikawa, Kumamoto, Nagasaki, Niigata, Yamaguchi, and Yamanashi prefectures on July 25, as well as the Amami Islands, Okinawa main island, and the Yaeyama islands. Authorities may update, extend, or rescind advisories as weather conditions change over the coming days.
Hazardous Conditions
The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the region. Heatwaves also pose a threat to 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 extend to relatively healthy individuals during significant heatwave events.
Transport and Utilities
Very 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 airfreight 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.
Advice
Monitor local media for weather updates and related advisories. During heatwaves, remain indoors in air conditioning when possible. If outdoor activities are necessary, frequently rest in shaded areas; avoid activity during the hottest times of the day. Stay well-hydrated by drinking plenty of fluids. Avoid caffeinated and alcoholic beverages, which are dehydrating. Wear loose-fitting, light-colored clothing. Cotton fabrics are more cooling than synthetics. Promptly seek medical attention if signs of heat exhaustion or heat stroke develop. Charge battery-powered devices in case prolonged electricity outages occur.
