PAGASA upgraded Tropical Depression Nando (internationally known as Ragasa) to a tropical storm at 23:00 LT (15:00 UTC) on September 18, 2025. The system will continue to intensify while over the Philippine Sea and may reach typhoon category by Saturday, September 20. Further intensification into super typhoon category while traversing the Extreme Northern Luzon is not ruled out.
A gravity anomaly recorded by NASA–German GRACE satellites in early 2007 over the Atlantic Ocean points to mass redistribution near Earth’s core–mantle boundary, around 2 700–2 900 km (1 700–1 800 miles) deep. Researchers suggest a perovskite-to-post-perovskite mineral phase change produced decimetric boundary shifts, offering the first evidence that deep mantle processes can unfold within just a few years and potentially affect Earth’s magnetic field.
Monsoon floods in Pakistan have killed at least 972 people and injured about 1 062 since June 26, 2025, affecting 6.3 million and displacing 2.9 million across the country. Khyber Pakhtunkhwa remains the worst-hit province with more than 500 fatalities, while Punjab has reported 290 deaths and Sindh over 173 000 displaced. Health authorities have also issued dengue alerts for major cities in Sindh, where stagnant floodwaters heighten the risk of outbreaks.
A geomagnetic storm that began late on September 14, 2025, intensified to G3 – Strong levels early on September 15, producing auroras visible as far south as Texas. The storm was driven by a negative polarity coronal hole high-speed stream (CH HSS) with possible influence from a coronal mass ejection (CME) launched on September 11.
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.
