A long-track tornado was confirmed northeast of Montezuma Creek in San Juan County, Utah, between 12:30 and 13:05 MDT on September 13, 2025, about 10–13 km (6–8 miles) northeast of Montezuma Creek and 35 km (22 miles) southeast of Blanding. The National Weather Service issued a tornado warning for southeastern Utah and western Colorado.
A newly discovered comet, designated SWAN25B, emerged from behind the Sun in early September 2025 and was added to the Minor Planet Center’s Possible Comet Confirmation Page on September 12. The object is currently reported at magnitude 8.3 in MPC data, with independent amateur estimates placing it slightly brighter at magnitude 7.4–7.5. Orbit calculations are still in progress.
At least 25 people are confirmed dead or missing after floods and landslides struck Bali and East Nusa Tenggara, Indonesia, between September 9 and 11, 2025. Torrential rains inundated large areas, collapsed buildings, and forced the evacuation of more than 500 residents.
A sudden stratospheric warming event is unfolding over Antarctica in early September 2025, rapidly weakening the southern polar vortex. Forecast models indicate potential downstream effects on the Northern Hemisphere jet stream, with implications for winter 2025/26 in the USA and Canada.
A powerful JEF3 tornado struck Makinohara and Yoshida in Japan’s Shizuoka Prefecture on September 5, 2025, injuring at least 89 and damaging over 1 300 structures in the region. The Japan Meteorological Agency (JMA) reported peak winds of around 270 km/h (168 mph), making it one of the strongest tornadoes on record in the country.
Over 60 000 people were evacuated as Tropical Storm Tapah made landfall near China’s Taishan (Jiangmen), Guangdong Province, at about 00:50 UTC on September 8, 2025. The storm brought severe weather across the province, causing traffic disruption and leaving at least 12 people injured.
Hurricane Kiko remains a Category 3 system in the central Pacific, forecast to pass north of Hawaii early next week while generating hazardous surf and rip currents from Sunday onward. A statewide State of Emergency was declared on September 5 to prepare for potential impacts.
Northern Sichuan recorded its most intense rainfall of 2025 on September 5, with 12-hour accumulations exceeding 250 mm (10 inches) in Guangyuan and Nanchong, and a provincial maximum of 255.2 mm (10 inches) in Chaotian District. The rainfall triggered flash flooding, street inundations, and emergency responses across multiple districts in Guangyuan and Nanchong.
Hurricane Kiko remains a strong category 3 system with maximum sustained winds of 205 km/h (125 mph), moving west at 15 km/h (9 mph). Swells from the storm are expected to reach the Hawaiian Islands late this weekend, producing life-threatening surf and rip currents.
Hurricane Lorena weakened into a tropical storm on September 4, 2025, after bringing heavy rains and flooding to Los Cabos, Mexico. The storm, though no longer expected to make landfall, is still going to bring life-threatening flood conditions to Baja California Sur, Sonora, and parts of the southwestern United States.
