Japan Typhoon Krovanh Heavy Rain Warning & Shinkansen...

The Japan Meteorological Agency has issued emergency heavy rainfall warnings for Tokyo and six surrounding prefectures as Typhoon Krovanh interacts with a seasonal weather front.

TOKYO, Japan — Commercial transport networks and tourism corridors across Eastern and Central Japan are managing severe weather disruptions following emergency advisories issued on Sunday, 6 September 2026 by the Japan Meteorological Agency (JMA). Pushing warm, moisture-laden air into a stationary autumn weather front, Typhoon Krovanh has created conditions favorable for intense linear rainbands, raising immediate risks of landslides, urban flooding, and swollen river systems across seven key prefectures.

The warning area encompasses Japan’s primary tourist transit axis: Tokyo, Saitama, Kanagawa, Chiba, Shizuoka, Aichi, and Mie. High-speed rail operators and aviation authorities are warning of potential service suspensions along the Tokaido Shinkansen line and at Narita International Airport (NRT).

Weather Alert Metric	Official Forecast & Meteorological Parameter
Issuing Authority	Japan Meteorological Agency (JMA)
Primary Weather Drivers	Typhoon Krovanh + Seasonal Front (Linear Rainband Formation)
Official Alert Date	Sunday, 6 September 2026
Seven Primary Prefectures	Tokyo, Saitama, Kanagawa, Chiba, Shizuoka, Aichi, Mie
Maximum Tokai Rainfall	Up to 300 mm in 24 hours (through Monday morning)
Maximum Kanto-Koshin Rainfall	Up to 250 mm in 24 hours (including Greater Tokyo area)
Maximum Kinki Rainfall	Up to 200 mm in 24 hours (including Osaka & Mie border)

Linear Rainband Threat Triggers High-Level Alerts Across Seven Key Prefectures

Linear rainbands occur when convective storm clouds align sequentially, dropping heavy precipitation over specific geographic zones for several consecutive hours. The JMA warns that ground saturation across mountain slopes in Shizuoka and Kanagawa creates severe landslide risks, while urban runoff threatens underground transit stations in Tokyo and Nagoya.

The seven affected prefectures form the backbone of Japan's domestic and international travel network:

Tokyo Metropolis: Primary international entry gateway and transit hub handling heavy commuter and tourist flows across Yamanote and subway networks.
Chiba Prefecture: Host to Narita International Airport (NRT) and major coastal transport lines.
Kanagawa Prefecture: Encompasses Yokohama, Kamakura, and the mountain resort district of Hakone.
Shizuoka Prefecture: Encompasses Mount Fuji, Fuji Five Lakes, and the Izu Peninsula.
Aichi Prefecture: Anchored by Nagoya, a critical interchange node on the Tokaido Shinkansen bullet train line.
Saitama & Mie Prefectures: Home to key cultural sites including the Ise Shrine and regional overland rail links.

Affected Region	Primary Tourist Destinations	Main Infrastructure Vulnerability
Tokyo	Asakusa, Shibuya, Shinjuku, Imperial Palace	Local subway flooding & urban rail delays
Chiba	Narita Airport (NRT), Tokyo Disney Resort	Express train speed restrictions to Narita
Kanagawa	Hakone, Yokohama, Kamakura	Mountain landslides & coastal storm surges
Shizuoka	Mount Fuji, Fuji Five Lakes, Izu Peninsula	Torrential rain (up to 300mm) & trail closures
Aichi	Nagoya Castle, Shinkansen Interchange Hub	High-speed rail suspensions on Tokaido line
Mie	Ise Grand Shrine, Shima Coast	Rural road washouts & river flooding
Saitama	Kawagoe Historic District, Chichibu	Regional river flooding & local train delays

Regional 24-Hour Rainfall Predictions and Meteorological Benchmarks

The JMA has published specific 24-hour accumulated rainfall projections through Monday morning, highlighting intense precipitation bands across three major regional zones:

Regional Forecast Zone	Included Prefectures & Hubs	Projected 24-Hour Accumulation	Operational Risk Level
Tokai Region	Shizuoka, Aichi, Mie	Up to 300 mm	Severe: High landslide & Shinkansen suspension risk
Kanto-Koshin Region	Tokyo, Chiba, Kanagawa, Saitama	Up to 250 mm	High: Urban drainage strain & airport rail delays
Kinki Region	Border areas including Osaka & Mie	Up to 200 mm	Moderate-High: Regional rail flow restrictions

Navigating Japanese Transit Corridors: Shinkansen Bullet Trains, Narita Airport, and Metro Rail Guidance

International travelers navigating Japan during Typhoon Krovanh can protect their itineraries by following established transit protocols monitored by the Japan National Tourism Organization (JNTO):

Tokaido Shinkansen High-Speed Rail (JR Central)

Speed Restrictions & Suspensions: JR Central enforces strict rain-gauge thresholds along the Tokaido Shinkansen between Tokyo, Nagoya, and Shin-Osaka. When rainfall exceeds safety parameters (especially in Shizuoka), bullet trains automatically halt or operate under severe speed reductions.
Pre-Trip Verification: Travelers holding JR Passes or Shinkansen reservations should check live train status applications (such as JR-WEST or SmartEX) prior to departing hotels.

Airport Connections (Narita NRT & Haneda HND)

Narita Express (N'EX) & Keisei Skyliner: Heavy rain in Chiba Prefecture frequently leads to speed restrictions on the Narita Express and Keisei Skyliner train services connecting Narita Airport to Tokyo Station and Ueno.
Flight Schedules: Passengers flying out of Narita (NRT) or Haneda (HND) should allow at least 2 additional hours for airport transit and verify flight status directly with airlines.

Urban Metro & Regional Lines

Subway & Local Rail: Tokyo Metro, Toei Subway, and JR East suburban lines may implement temporary holding patterns during peak rainband passes. Avoid low-lying underpasses and riverside promenades.

Transit Operator / Corridor	Operating Line	Expected Typhoon Impact	Traveler Recommendation
JR Central	Tokaido Shinkansen (Tokyo–Nagoya–Osaka)	High probability of delays or holding patterns	Confirm live train status on SmartEX app
JR East / Keisei	Narita Express (N'EX) & Skyliner	Speed reductions & potential track holds	Allow 2+ extra hours to reach Narita Airport
Tokyo Metro / Toei	Greater Tokyo Urban Subway Network	Minor delays; station entrance water management	Monitor station announcements & digital displays
Hakone Tozan Railway	Odawara to Hakone-Yumoto	High landslide risk; mountain rail suspensions	Avoid mountain travel during heavy rain warnings

Impact on Tourist Destinations Across Mount Fuji, Hakone, Nagoya, and Mie

The severe weather threat directly impacts outdoor sightseeing and mountain recreation:

Mount Fuji & Fuji Five Lakes (Shizuoka): Torrential rain (up to 300 mm) reduces visibility to zero and creates hazardous mudslides along mountain roads and hiking trails. Outdoor activities across Kawaguchiko and Yamanakako are suspended.
Hakone & Kamakura (Kanagawa): Cable cars, ropeways, and pirate ship cruises on Lake Ashi face operational halts during high winds and heavy rainfall.
Nagoya & Ise (Aichi & Mie): Heavy precipitation along central transit corridors affects access to Nagoya Castle and rural pilgrim routes leading to Ise Grand Shrine.

Frequently Asked Questions

Which Japanese prefectures are under heavy rain warnings for Typhoon Krovanh?

The JMA has issued heavy rain warnings for seven key prefectures: Tokyo, Saitama, Kanagawa, Chiba, Shizuoka, Aichi, and Mie.

How much rainfall is expected from Typhoon Krovanh?

Forecasts predict up to 300 mm in the Tokai region (Shizuoka/Aichi), up to 250 mm in Kanto-Koshin (Tokyo/Chiba/Kanagawa), and up to 200 mm in the Kinki region.

Are Tokaido Shinkansen bullet trains affected by the storm?

Yes. Heavy rain in Shizuoka and Aichi frequently triggers automatic speed reductions or temporary service suspensions along the Tokaido Shinkansen line between Tokyo, Nagoya, and Osaka.

How can international travelers check flight and train status during the typhoon?

Travelers should check live updates via JNTO's Japan Official Travel App, the JR Central SmartEX app, and official airline portals before traveling to stations or airports.

Japan Issues Heavy Rain Warnings for Tokyo and Six Prefectures as Typhoon Krovanh Threatens Shinkansen and Airport Transit