A strong high-pressure system is bringing widespread sunny weather from western to northern Japan this Sunday [1], [2].
The shift in weather patterns provides a critical window of stability for the archipelago, though it introduces significant heat risks for southern and western residents.
TBS NEWS DIG said the high-pressure system is dominating the region, suppressing cloud formation and driving hot air northward [1], [2]. This has resulted in abundant sunshine for Tokyo for the first time in approximately five days [1].
Temperatures are rising sharply in several cities. In Morioka, the forecast is 26°C, which is 13°C higher than the previous day [1]. Other forecasts include 27°C in Tokyo, 28°C in Nagoya, and 30°C in Osaka and Naha [1].
The Tokai-to-west region is experiencing severe humidity and heat, with temperatures exceeding 30°C [1], [2]. Fukuoka is expected to reach 31°C [1].
Due to these conditions, officials said they have issued a heat alert for the Yaeyama area of Okinawa [1]. This marks the first heat alert of the season for that region [1].
Other regional maximum temperature forecasts include 20°C in Sapporo, 14°C in Kushiro, 23°C in Aomori, 24°C in Sendai and Niigata, 27°C in Nagano, Kanazawa, and Kochi, 29°C in Hiroshima and Matsue, and 28°C in Kagoshima [1].
“Tokyo will receive abundant sunshine for the first time in about five days”
The rapid temperature spike, particularly the 13°C jump in Morioka, demonstrates the volatility of the current high-pressure system. The issuance of the season's first heat alert in Okinawa signals the transition into a period of high thermal stress, requiring increased public health vigilance against heat-related illnesses across the southern and western prefectures.
