Authorities issued evacuation orders for more than 150,000 people in central, eastern and northeastern Japan, Kyodo News said, with warnings of dangerous landslides from the heavy rain.

[2] The Joint Typhoon Warning Center (JTWC) then started to monitor the system late on June 7, as it had scattered deep convection over its poorly-defined low-level circulation center (LLCC), but was under an environment of 28–30 °C (82–86 °F) sea surface temperatures, low vertical wind shear, good divergence and enhanced poleward outflow.

[3] As the system moved westward, it significantly organized, prompting the JTWC to issue a Tropical Cyclone Formation Alert (TCFA) by the next day.

[15] By the next day, it further strengthened to a Category 2-equivalent typhoon, as an outflow channel became apparent while it took a north-northwestward turn around the western periphery of the subtropical ridge.

[19] Guchol ultimately reached its peak intensity at 18:00 UTC that same day, with 10-minute sustained winds of 100 knots (185 km/h; 115 mph) and a central pressure of 930 hectopascals (27 inHg), according to the JMA.

[22] The system then started to weaken from its peak intensity at 12:00 UTC that day,[20] as it was completing the replacement cycle while moving into slightly cooler sea surface temperatures.

[23][2] At 09:00 UTC on June 18, Guchol weakened into a category 3-equivalent typhoon, as its eyewall deteriorated while turning to the north-northeast, along with increasing wind shear.

[30] Traversing the Kanto-Koshin region, the system emerged to the coast of Fukushima Prefecture, with the JMA issuing their final advisory by the next day, as it fully became an extratropical cyclone.

[20] Although Typhoon Guchol (locally known as Butchoy) remained away from the Philippines, its slow movement enhanced the southwest monsoon over the country and resulted in widespread heavy rain.

The effects of these rains were relatively limited though, with isolated flooding over parts of Marikina, Navotas, Malabon, Marilao, and Guagua, with no major damage reported.

[32] Authorities issued evacuation orders for more than 150,000 people in central, eastern and northeastern Japan, with warnings of dangerous landslides from the heavy rain.