At least 14 people were killed and 46 remain missing after the Maitai’an Creek barrier lake overflowed in Hualien County, Taiwan, on September 23, 2025. The flood, triggered by extreme rainfall from former Typhoon Ragasa, released about 60 million tonnes of water downstream, inundating Guangfu Township and nearby areas.
Heavy to excessive rainfall from monsoon thunderstorms may bring isolated flash and urban flooding to the Desert Southwest into Sunday, September 28, 2025. A plume of anomalously high monsoonal moisture streaming northward on the eastern flank of a slow-moving upper-level low will fuel several rounds of widespread showers and thunderstorms, with greatest impacts expected across southeastern Arizona and southwestern New Mexico.
New activity/unrest was reported for 6 volcanoes from September 17 to 23, 2025. During the same period, ongoing activity was reported for 23 volcanoes.
Tropical Storm Humberto formed on September 23, 2025, as the 8th named storm of the 2025 Atlantic Hurricane Season. While it doesn’t pose any threat to land as of now, the system is expected to strengthen into the 3rd hurricane of the season in a few days before becoming a major hurricane by September 28.
A strong earthquake registered by the USGS as M6.3 hit northern Venezuela at 03:51 UTC on September 25 (23:51 local time on September 24), 2025. The agency is reporting a depth of 14 km (8.8 miles). This is the second strong earthquake to hit this area after M6.2 at 22:21 UTC on September 24.
A strong earthquake registered by the USGS as M6.2 hit northern Venezuela at 22:21 UTC (18:21 local time) on September 25, 2025. The agency is reporting a depth of 8 km (5 miles). EMSC is reporting the same magnitude and depth. The USGS issued a Yellow alert for shaking-related fatalities and economic losses.
A minor eruption was reported at Barren Island volcano in the Andaman Sea at around 10:15 LT (04:45 UTC) on September 20, 2025, two days after a shallow M4.2 earthquake in the region. The National Centre for Seismology suggested the quake may have disturbed the magma system, although no independent confirmation of the link is available.
Tropical Storm Bualoi, known in the Philippines as Opong, intensified over the Philippine Sea on September 24, 2025, moving west-northwest at 20 km/h (12 mph) with winds of 95 km/h (59 mph) and gusts up to 115 km/h (71 mph). PAGASA forecasts landfall in the Bicol Region on September 26, with warnings issued for heavy rainfall, flooding, and storm surge of up to 3 m (10 feet) along eastern coastal provinces.
Ragasa made landfall over the coast of China’s Guangdong Province at 17:00 LT (09:00 UTC) on September 24, 2025, as a severe typhoon, with sustained winds of 145 km/h (90 mph). The storm caused widespread disruption across southern China, Hong Kong, and Taiwan, where at least 17 people were killed in flooding a day earlier.
Widespread thunderstorms are forecast across the United States on Wednesday and Thursday, September 24 and 25, 2025, as a cold front advances eastward. The Weather Prediction Center (WPC) has issued a Slight Risk of Excessive Rainfall for parts of the Ohio and Tennessee Valleys, while isolated flash flooding is possible in southern New England and the New York City metropolitan area as storms reach the Northeast.
