An EF1 tornado confirmed near Alta, Wyoming, in the Teton Canyon area of the Caribou–Targhee National Forest on October 15, 2025, was officially verified on October 28. It is the third tornado ever recorded in Teton County and the first October tornado on record in Wyoming.
An early-season stratospheric warming event is forecast to weaken the polar vortex in the coming weeks, potentially influencing winter 2025–26 weather across North America and Europe.
The National Weather Service issued winter weather advisories for the Cascades of Whatcom, Skagit, and western Okanogan counties, Washington, from Wednesday, November 5, through 10:00 PST (18:00 UTC) on Friday, November 7, 2025, as moderate to heavy mountain snow continues.
A strong cold front will drive frigid Arctic air deep into the United States this weekend into next week, November 10, 2025 onwards, bringing December-like temperatures, widespread freezes, and the season’s first snow for some areas east of the Rockies.
A Flood Watch is in effect for Mason County, Washington, from Thursday afternoon through Saturday morning, November 6-8, 2025. Due to persistent rain, the Skokomish River is expected to rise above flood stage.
Four back-to-back atmospheric rivers are forecast to make landfall along the U.S. West Coast between November 3 and November 9, 2025. Heavy rainfall totals of 76–130 mm (3–5 inches), with isolated amounts up to 177 mm (7 inches), could lead to localized flooding in parts of northern California and Washington State throughout the week.
Mount Mitchell in North Carolina recorded its first snowfall of the season on Thursday morning, October 30, 2025, roughly a month before the start of meteorological winter, as a cold front lowered snow levels to around 1 524 m (5 000 ft).
A low-pressure system moving through the mid-Atlantic and Northeast United States brought nearly 76 mm (3 inches) of rainfall to the New York region on October 30, 2025, causing flash floods that left two people dead after becoming trapped in flooded basements.
A strong atmospheric river is forecast to make landfall over the Pacific Northwest early on October 31, 2025, bringing heavy rainfall and high freezing levels to western Washington. The event is expected to produce AR3–AR4 conditions, with 75–125 mm (3–5 inches) of rain forecast in the Olympic Peninsula and North Cascades. Two additional atmospheric rivers are expected to follow between November 3 and 5.
A small explosion occurred at Korovin volcano on Atka Island, Alaska, at 21:27 AKDT on October 29, 2025, prompting the Alaska Volcano Observatory to raise the Aviation Color Code and Alert Level to Yellow / Advisory.
