Tropical Storm Chan-hom Puts Tokyo and Tohoku Travel on Alert August 11

Tropical Storm Chan-hom is expected to make landfall in northern Kanto between late Tuesday and early Wednesday, August 11 to 12 local time, with strong wind and heavy rain aimed at Ibaraki and Fukushima prefectures during Bon-holiday travel.

If you fly All Nippon Airways into or out of Tokyo Haneda, Tokyo Narita, Fukushima, or Sendai on August 11, or hold MOL Sunflower ferry tickets between Oarai and Tomakomai on Tuesday or Wednesday, the traveler decision is to recheck carrier and ferry status before you leave for the airport or terminal and use change or refund tools only when your ticket rules and the operator’s weather notice allow them.

What the Japan Meteorological Agency expects

The Japan Times reported on August 10 that Tropical Storm Chan-hom was moving northwest at about 25 kilometers per hour and was forecast to make landfall in Ibaraki and Fukushima prefectures. That path would be the first storm landfall in either prefecture for this system, according to the same report, which attributes the landfall window and rainfall rates to the Japan Meteorological Agency.

The agency said it was highly likely to issue warnings for heavy rain, strong winds, and landslides in Fukushima Prefecture for Tuesday, and it urged residents and tourists traveling during the Bon holiday to stay alert. Forecast language in the report includes up to 40 millimeters of rain per hour on Tuesday in the Tohoku region and maximum gusts near 30 meters per second, about 108 kilometers per hour.

Chan-hom is described as the season’s 15th named storm. After crossing the main island, it is expected to move toward the Sea of Japan and likely weaken to a tropical depression. That sequence matters for travelers because the worst air and surface disruption often clusters on the landfall day and the hours immediately after, not only on the distant ocean track map.

For a Bon-period visitor who planned a quiet midweek transfer from Tokyo into Tohoku or a ferry hop toward Hokkaido, the practical takeaway is simple. Treat Tuesday and Wednesday as weather-controlled days until operators publish a cleaner all-clear, not as fixed schedule days you can ignore until the morning of travel.

What ANA is telling passengers

Japan Times reporting states that All Nippon Airways said flights in and out of Haneda, Narita, Fukushima, and Sendai airports might be affected by the weather. That is an operator risk flag, not a full pre-cancel list for every flight number. Japan Airlines had not announced potential impacts in the same report, and East Japan Railway had not announced schedule changes for the Tohoku Shinkansen or Yamagata Shinkansen lines that pass through Fukushima Prefecture. Travelers should still open the live ANA international flight-status board and the matching domestic board for the exact flight number on August 11, because carriers often tighten or widen the airport list as the track updates through the night.

The distinction between a risk flag and a cancel is the whole point of the next traveler move. A risk flag means you should stop treating the ticket as locked, free up hotel flexibility if you can, and watch for a free change window before you buy a second expensive ticket. A published cancel is when you actually execute rebooking and file refund or reissue steps under the rules for that ticket type. Jumping from risk flag to a paid last-minute alternate too early can strand you with two nonrefundable fares if the original aircraft still operates.

Deep Arrival’s ANA airline guide remains useful for network context because ANA concentrates long-haul and domestic connections around both Tokyo airports. Booking the wrong Tokyo airport already creates transfer friction on a clear day. On a storm day, a delayed Haneda domestic leg can break a Narita international connection even when both flights still show as operating in the morning.

If your ticket is with WestJet on Canada to Tokyo Narita for the same storm window, that is a separate rebooking stream already covered in Deep Arrival’s earlier WestJet Tokyo flex notice. This article focuses on Japan-side airports, domestic Tohoku risk, and the Oarai ferry cancelations that WestJet customers do not control through a Canadian waiver page.

Ferry cancels and road-level risk

MOL Sunflower canceled ferries between Oarai in Ibaraki Prefecture and Tomakomai in Hokkaido for Tuesday and Wednesday, according to Japan Times reporting. That overnight sea link is a common alternative for travelers who prefer not to fly Tokyo to Hokkaido. When both air and ferry options tighten on the same two days, Hokkaido-bound travelers can lose backup capacity faster than the storm map alone suggests. If your plan was “flight first, ferry backup,” reverse the checklist and confirm whether any residual ferry inventory exists later in the week before you rebook nonrefundable Hokkaido hotels around a Tuesday arrival that no longer has a ship.

Rail had no announced Tohoku Shinkansen change at the time of the Japan Times report. That is good news for planners who can shift from a fragile evening flight to a daytime train, but it is not a guarantee that platforms stay normal if landslides or wind warnings expand. Always recheck JR East and local operator notices on the morning of travel.

Ground transfers around Narita and Haneda can also slow even when your aircraft still departs. Heavy rain reduces bus and taxi reliability, and terminal crowd patterns change when airlines hold passengers for weather updates. Build buffer time into airport arrival plans rather than treating the published departure minute as the only decision point.

How to decide before August 11

Start with the named entity on your ticket. If you hold ANA itineraries touching Haneda, Narita, Fukushima, or Sendai on August 11, open ANA flight status and any weather change or refund notice for your ticket type before you rebook hotels or buy a second set of tickets. If you hold MOL Sunflower Oarai to Tomakomai tickets for Tuesday or Wednesday, treat those sailings as canceled and use the ferry operator’s rebooking path rather than hoping for a last-minute sailing.

Travelers already in Tokyo who planned a short Tohoku day trip should weigh whether the destination sits under the expected heavy-rain and landslide warning zone. A museum day in central Tokyo is a different risk profile from a mountain or coastal day in Fukushima during peak rainfall hours. Deep Arrival’s four-day Tokyo itinerary can help re-sequence indoor city days if you need to delay a side trip without abandoning the whole Japan plan.

International visitors connecting through Tokyo Disney Resort or other Chiba-side plans should remember that Narita access and weather are related but not identical problems. Resort parks can operate under different thresholds than aircraft, so a park day may still be open when an evening departure is at risk. Use the Tokyo Disney Resort guide for resort logistics only after you confirm the airport side of the day still works.

If your trip is still several days out, do not force a cancel purely on a pre-landfall forecast. Storm tracks shift. Keep flexible hotel cancellation where you already have it, watch JMA and ANA updates through Monday night Japan time, and decide when the operator posts a clearer cancel or free-change window for your exact flight.

Chan-hom is a named, dated weather problem with a clear airport list and a confirmed ferry cancel window. Act on those operator facts first, then fill in hotels and sightseeing only after the transport piece is stable.