Tropical Storm Nanmadol (2017)

Severe Tropical Storm Nanmadol, known in the Philippines as Severe Tropical Storm Emong, was a tropical cyclone that impacted southern Japan in early July 2017. The third named storm of the annual typhoon season, Nanmadol developed over in the Philippine Sea as a tropical depression on July 1 before strengthening into a tropical storm on July 3. After gaining organization, the system rapidly developed and intensified into a severe tropical storm and reached its peak intensity with 10-minute maximum sustained winds of 100 km/h (60 mph) and a minimum barometric pressure of 985 hPa (29.1 inHg). On July 4, Nanmadol turned eastward and made landfall near Nagasaki, Kyushu, just before it transitioned into an extratropical cyclone.

Nanmadol dropped torrential rainfall across Kyushu, resulting in landslides, although the Fukuoka and Ōita Prefectures were the hardest hit. The city of Asakura, Fukuoka experienced a one-day rainfall surpassing the city's average total for July by 50%, with a rainfall of 500 mm (20 in) recorded within a 12-hour period on July 5. Landslides were recorded in 44 different locations and flooding in 38 locations, and from this, more than 2,600 homes were destroyed. In total, 42 people died from Nanmadol due to drowning from flash flooding or due to landslides. Total damages was estimated at ¥190 billion (US$1.68 billion).