How the remains of T9 will bring mid-summer temperatures to Japan
Good evening, everyone and what a day it has been, watching T9 thread the needle between Okinawa and Taiwan. Yes, both islands got hit fairly hard by the storm, but it could have been much worse for both had the system gone 100km either north or south. From this point on, T9 will make landfall on Mainland China later this evening, but then, data from the Europe-based ECMWF shows something really interesting: the remnants of T9 will curve over China and head northeast. Somewhere around Qingdao, it will combine with a front already moving over northeast China and begin to move toward the Korean Peninsula. After soaking Pyongyang, the front, containing the zombified remains of T9, will fly over Hokkaido and northern Tohoku, bringing a very healthy rainfall to the region late on the 15th and on into the 16th before it finally heads out to sea. As it moves on over Hokkaido, winds will be stiff, but not drastic, moving around 20-30kph.
The long-term US-based GFS model shows roughly the same thing, with the corpse of T9 joining the front a little further north, around Dailan, then making its way to Hokkaido in the Thursday evening to Friday timeframe.
But, hey, T9 is not going to go out that easy. Read on...
For the rest of Japan, as it has been noted, summer has come. Temperatures in the high 20s-lower 30s will be seen across the country, but the zombie remains of T9, interestingly enough, are going to power our latest warm wave, due to peak on Wednesday and Thursday of this week. So, the mechanics behind this are pretty simple.
https://reddit.com/link/1utkerx/video/himp2yyfslch1/player
Above: The ECMWF's projection for T9 for the next week.
https://reddit.com/link/1utkerx/video/09oz9x33tlch1/player
First, you have the standard rotation of low and high pressure systems: lows rotate counter-clockwise, highs rotate clockwise. And, yes, we are talking about the northern hemisphere here. We have a positioning of a gaggle of lows in the west, and a similar gang of highs to the east. Japan is right in the middle of this high/low standoff, putting us right in the crosshairs of wind flow coming up from the tropics.
And then we have the former T9, which refuses to die and still wants to be a weather player. It would be easy to write off T9 after landfall as a done-and-done storm and that’s it. But, it will still be significant as it drifts over Mainland China and maintains its rotation, even as it loses typhoon and tropical storm status. The result is that wind flow from the former T9 will provide a massive pull to corral moist tropical air over much of Japan in the middle part of this week.
Kansai and Chubu (Osaka and Nagoya, specifically) will be the major beneficiaries of the influx of tropical air as those locales will hit mid-summer level highs (猛暑, mosho) of 35-37c through Wednesday.
Yeah, there's no avoiding it. We had a decent rainy season, but we have to face the climatological music now. It's summer. Buckle in and enjoy the ride.
Posted Jul 11, 2026, 1:39 PM UTC