Tropical Storm Nanmadol (2017)

This article is about the 2017 tropical storm. For other storms of the same name, see List of storms named Nanmadol and List of storms named Emong.
Severe Tropical Storm Nanmadol (Emong)
Severe Tropical Storm Nanmadol near peak intensity on July 3
Meteorological history
FormedJuly 1, 2017
ExtratropicalJuly 4, 2017
DissipatedJuly 8, 2017
Severe tropical storm
10-minute sustained (JMA)
Highest winds100 km/h (65 mph)
Lowest pressure985 hPa (mbar); 29.09 inHg
Category 1-equivalent typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds120 km/h (75 mph)
Lowest pressure974 hPa (mbar); 28.76 inHg
Overall effects
Fatalities42 total
Damage$1.68 billion (2017 USD)
Areas affectedJapan
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Part of the 2017 Pacific typhoon season

Severe Tropical Storm Nanmadol, known in the Philippines as Severe Tropical Storm Emong, was a tropical cyclone that impacted southern Japan during July 2017. Nanmadol developed over in the Philippine Sea as a tropical depression on July 1, and strengthened into the third named storm of the 2017 typhoon season on July 3. After gaining organization, the system rapidly developed and intensified into a severe tropical storm and reached its peak intensity with a 10-minute maximum sustained winds of 100 km/h (62 mph) and a minimum barometric pressure of 985 hPa (29.1 inHg). On July 4, Nanmadol turned eastwards 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 to have toppled to ¥190 billion (US$1.68 billion).