Japan: severe weather forecast for northern regions until at least July 1


June 28, 2022 | 21:51 UTC

Severe weather forecast over northern Japan until at least July 1. Possible disturbances.

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JPN

Event

Thunderstorms and heavy rain leading to possible flooding, landslides and lightning are expected in northern Japan until at least July 1. At the beginning of June 29, the Japan Meteorological Administration issued the following warnings:

  • Red warnings for heavy rain and landslides: Akita and most prefectures of Hokkaido.

  • Yellow warnings for heavy rain, thunderstorms, flooding, gales and landslides: the rest of the affected area.

Authorities will likely issue new warnings or update existing advisories in the coming days; officials can issue evacuation orders if weather conditions persist or worsen.

Authorities have warned that the risk of landslides is high in Hokkaido prefecture due to sustained heavy rains. Authorities evacuated six residents along the Pepan River in Asahikawa City, Hokkaido Prefecture due to the river overflowing in early June 29. Forecast models indicate 24-hour rainfall totals of 12 cm (5 inches) in the Hokkaido region and 8 cm (3 inches) in the Tohoku region until the beginning of June 30. In the Tohoku region, 24-hour rainfall totals of 5 to 10 cm (2 to 4 inches) are expected from early June 30 to early July 1.

Dangerous conditions
Sustained heavy rains could trigger flooding in low-lying communities near rivers, streams and creeks. Urban flooding is also possible in developed areas with easily submerged stormwater drainage systems. Sites located downstream of large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides remain possible in hilly or mountainous areas, especially where the ground has become saturated by heavy rainfall. Disruptions to electrical and telecommunications services are possible when major floods or landslides affect utility networks.

Transportation
Floodwaters and debris flows can render some bridges, railroads or roads impassable, impacting overland travel in and around affected areas. Puddling of road surfaces could lead to hazardous driving conditions on regional highways. Authorities may temporarily close some lower roads that are inundated by floodwaters. Inclement weather could also cause flight delays and cancellations at area airports. All Nippon Airways and Japan Airlines have warned that flight cancellations, diversions or delays could be possible at Hakodate (HKD), Odate–Noshiro (ONJ), Okhotsk Monbetsu (MBE), Okushiri (OIR) and Rishiri airports ( RIS) due to strong winds and poor visibility.

Authorities can temporarily suspend port operations or close waterfronts along the Sea of ​​Japan and North Pacific Ocean if strong winds trigger dangerous sea conditions. Floods could block regional rail lines; freight and passenger train delays and cancellations are possible in areas subject to heavy rain and possible track flooding. Authorities have suspended some train services in northern Japan due to unfavorable weather conditions.

Localized business interruptions may occur in low areas; some businesses may not be operating at full capacity due to facility damage from flooding, possible evacuations and the inability of some employees to get to job sites.

Tips

Monitor local media for weather updates and related advisories. Confirm all transportation reservations and business meetings before travel. Consider localized travel delays and potential supply chain disruptions where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices during extended power outages.

Resources

Japan Meteorological Administration

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