Extreme Weather: Japan and South Korea Hit by Heavy Rain Deluges

The severe weather events coincided with active tropical storm systems crossing the Pacific Ocean, highlighting regional vulnerability to intense precipitation.

Record Rainfall Paralyzes Chiba and Sakura in Japan

On 13 August, the city of Chiba near Tokyo recorded 115mm of rainfall in a single hour, while nearby Sakura measured 97mm within the same timeframe, according to local authorities. The Japan Meteorological Agency described the conditions as an “unprecedented level” of heavy rain, driven by warm, moist air from the north Pacific meeting cooler regional air masses.

Local authorities issued a level 5 emergency warning for heavy rain, marking the highest alert level and the first time such an alert has been implemented since the system was established in May. The severe weather prompted requests for more than 100,000 households to evacuate. Power outages affected over 20,000 homes in Chiba prefecture, and thousands of travelers remained stranded at Tokyo’s Narita airport.

Confirmed fatalities reached 13 people, including at least three individuals found trapped inside their vehicles. One person remains missing as rescue operations continue across the affected prefectures.

Torrential Downpours Strike South Korea

Total rainfall surpassed 400mm overnight, leading to widespread flooding on local roads and infrastructure strain.

Pacific Storm Systems: Hurricane Lala and Typhoon Saudel

Across the north Pacific, Hurricane Lala reached category 1 status on 15 August with wind speeds of about 80mph (130km/h), tracking west toward Hawaii. The storm passed just south of the island chain the following day, grazing the southern part of the main island and briefly weakening to a tropical storm before restrengthening into a category 4 hurricane on a northerly trajectory. Kona international airport recorded its lowest ever pressure as the storm passed.

Simultaneously, a separate weather system developed near Micronesia and was named Tropical Storm Saudel. Forecast models indicate the storm will intensify into a strong or potentially violent typhoon, tracking northwest toward the Northern Mariana Islands and threatening Okinawa prefecture next week.

Frequently Asked Questions

What triggered the severe rainfall in Japan and South Korea?

According to meteorological agencies, the extreme rainfall resulted from warm, moist air from the north Pacific meeting cooler air masses, creating severe precipitation bands.

How many people were affected by the evacuations in Chiba?

Local authorities asked more than 100,000 households to evacuate following the issuance of the level 5 emergency warning.

What was the peak rainfall recorded in South Korea?

The city of Geoje recorded 124.5mm of rain within one hour, with cumulative overnight totals exceeding 400mm.

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