Typhoon Dujuan Impacts Japan: Mechanism and Key Features
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Key takeaways
- Typhoon Dujuan hit Tokyo and eastern Japan as the country's 25th named storm of the season, bringing peak wind gusts of 194 km/h.
- The storm dumped a record 832 mm of rain on Izu Oshima island within 48 hours after interacting with Japan's Akisame zensen rain front.
- Tropical cyclones require ocean temperatures of at least 26.5°C to draw the warmth and moisture needed for intensification.
- Atmospheric research indicates that warm air carries roughly 7% more moisture for every 1°C temperature rise, increasing extreme rainfall risks.
Why in News
- Typhoon Dujuan hit Tokyo and eastern Japan with extremely heavy rain and strong winds. The storm dropped a record 832 mm of rain on Izu Oshima island in just 48 hours and caused record rainfall in Tokyo's Edogawa ward.
About Typhoon Dujuan
- Typhoon Dujuan is a strong tropical cyclone from the Northwestern Pacific Ocean. It was Japan's 25th named storm of the season, with sustained winds of 130 km/h and gusts up to 194 km/h. The name Dujuan comes from China and means the azalea flower.
- The storm formed over warm Pacific waters and moved northwest toward eastern Honshu, directly affecting Tokyo and the Boso Peninsula.
How It Forms
- Sea surface temperatures must be at least 26.5°C to drive rapid evaporation, which provides the heat and moisture needed for cyclone growth.
- Warm moist air rises and condenses, releasing latent heat that lowers air pressure and strengthens the storm system.
- The rotation of the Earth creates the Coriolis effect, which turns incoming winds counterclockwise around the low-pressure center in the Northern Hemisphere.
- Moisture from the warm Pacific Ocean mixed with Japan's seasonal autumn rain front (Akisame zensen), which greatly increased total rainfall.
Key Features of Typhoon Dujuan
- The cyclone brought extreme rain, dumping 832 mm of rainfall on Izu Oshima within 48 hours and bringing heavy downpours across Tokyo.
- It produced strong sustained winds of 130 km/h and gusts of 194 km/h, causing power outages and building damage in Chiba and Kanagawa.
- Heavy rain soaked the hilly volcanic soil, causing dangerous landslides and mudslides in coastal regions.
- The storm disrupted operations at Haneda and Narita airports, stopped bullet train lines, and forced organizers to cancel large public events.
Significance
- Air holds about 7% more moisture for every 1°C increase in temperature, leading to heavier rainfall when storms hit seasonal fronts.
- This event highlights how useful Tokyo's underground flood protection systems are in shielding crowded urban areas from severe flooding.