Severe floods affecting Gila County and parts of central Arizona since September 25, 2025, left at least four people dead and created a major hazmat risk in Globe after around 1 000 propane tanks were washed into the downtown area. Multiple historic buildings in Globe sustained structural damage, prompting officials to declare the city center unsafe.
A series of atmospheric rivers (AR) is forecast to hit the U.S. West Coast from late September through early October, beginning with a strong AR that made landfall over British Columbia on September 26, 2025. Forecasts show moderate AR conditions in Washington, Oregon, and northern California on September 28, followed by a stronger system making landfall on September 30 and potentially continuing into October 7.
At least 10 people have been confirmed dead in Philippines as of September 26 due to Tropical Storm Bualoi (locally named Opong), which made landfall Eastern Samar on September 25 before crossing into Masbate and sweeping through the Bicol region. The storm left behind a trail of destruction, displacing thousands who were already reeling from the destruction left by former Super Typhoon Ragasa.
A rare stratospheric warming event is disrupting the Antarctic polar vortex in September 2025, with forecasts suggesting wetter southern Australia, drier eastern Australia, and a higher chance of abnormally hot days.
The Japan Meteorological Agency (JMA) raised the Alert Level for Meakandake volcano in Hokkaido, Japan, from 1 to 2 at 06:20 UTC (15:20 JST) on September 15, 2025, after an increase in seismicity near Ponmachineshiri Crater. From September 16 to 23, eruptive activity continued with 27–50 daily volcanic earthquakes, minor ashfall, and white steam-and-gas plumes rising 200–800 m (656–2 625 feet) above the crater rim. Access within 500 m (1 640 feet) of the crater remains restricted, affecting parts of Kushiro City and Ashoro Town.
Flash flooding struck Gila county, Arizona, displacing people and causing significant damage in the Globe-Miami area on September 25, 2025.
A shallow earthquake registered by the USGS as M5.9 hit off the coast of Oregon at 06:45 UTC on September 26, 2025 (23:45 local time, September 25). The USGS is reporting a depth of 10 km (6.2 miles). EMSC is reporting the same magnitude and depth.
Tropical Storm Humberto is forecast to strengthen into a major hurricane by the weekend, while tropical disturbance AL94 shows high chance of cyclonic development within 2 days from September 26, 2025.
A large sea surface temperature anomaly has developed in the North Pacific Ocean, extending toward the U.S. West Coast. Forecasts suggest the anomaly could help trigger colder-than-average conditions across central and eastern United States and Canada during the upcoming 2025/26 winter season, with a weak La Niña further reinforcing the setup.
A strong atmospheric river is forecast to shift southward along the British Columbia coast between September 26 and 29, 2025, bringing several low-pressure systems and periods of heavy rainfall to Vancouver Island and the South Coast. Forecasts suggest up to 100 mm (4 inches) of rain in west-facing coastal mountains, with persistent showers likely across the Lower Mainland.
