Two typhoons are forecast to bring disaster-level heavy rain to Japan's Kanto region on June 27, 2026 [1].

The convergence of these two storms creates a high risk of severe flooding and landslides. Because Typhoon 7 and Typhoon 8 are moving close together, they are generating combined moisture and wind that can trigger catastrophic rainfall [3].

Weather authorities said the Kanto region faces two distinct peaks of precipitation tomorrow [1]. The first window of heavy rain is expected from the early morning until before noon [2]. A second peak is forecast to occur between 5 p.m. and 9 p.m. [3].

Typhoon 7 is currently located near Okinawa and Amami, while Typhoon 8 is moving offshore from Shikoku [3]. The proximity of these systems increases the likelihood of extreme weather patterns across the archipelago.

Officials said the intensity of this event could be equal to or greater than the rainfall seen during Typhoon 6 in early June [4]. The potential for disaster-level rain puts critical infrastructure and residential areas at risk, especially in low-lying regions of Kanto [4].

Local authorities are monitoring the movement of both systems to provide real-time updates on potential landfall and evacuation orders. The interaction between the two storms makes the exact timing of the peaks critical for emergency preparations [3].

“Two typhoons are forecast to bring disaster-level heavy rain to Japan's Kanto region”

The simultaneous presence of two tropical cyclones creates a 'double-typhoon' effect, where the systems can reinforce each other's moisture transport. This increases the risk of extreme precipitation totals beyond what a single storm would produce, potentially overwhelming drainage systems and increasing the probability of landslides in the Kanto region.