Risk of Heat Wave in Japan Higher Than Usual July-Sept.; Meteorological Agency Calls for Preventative Measures for Heatstroke
16:34 JST, June 26, 2024
A higher-than-usual risk of a heat wave is expected from July to September as the North Pacific High — a high-pressure system over the Pacific Ocean — intensifies, according to the Japan Meteorological Agency’s three-month weather forecast released on Tuesday.
The agency is calling for measures to prevent heatstroke.
The probability of average temperatures exceeding those of the average year is 50% in northern Japan, 60% in eastern and western Japan, and 70% in Okinawa and Amami. Forecasted precipitation is about the same or higher than the average year in western Japan and about the same level in northern and eastern Japan.
A La Nina phenomenon, in which sea surface temperatures near the equator become cooler than normal, is expected to occur off the coast of Peru, South America, from summer to autumn. As a result, the northwestward extension of the North Pacific High and the northeastward extension of the Tibetan High from the Chinese mainland will strengthen, bringing a possibility that the two will overlap over Japan. Air temperatures tend to increase when a high-pressure system extends to high altitudes.
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