Blizzard warning have been issued with snowfall totals of up to 30 cm (12 inches) being forecast across the high western slopes along with gusts of 80 km/h (50 mph) across multiple mountain counties. The warnings are in effect for parts of West Virginia, western Maryland, and western Virginia from 10:00 EST Wednesday, December 10, 2025 to 10:00 EST Thursday, December 11.
Two successive atmospheric river pulses are affecting the Pacific Northwest this week, delivering multi-day heavy rainfall and flooding risk across western Washington and northwestern Oregon. The first made landfall early December 9, and a stronger second pulse is forecast to arrive late December 9–early December 10, maintaining high integrated vapor transport and major flood potential through December 11.
An intense extratropical cyclone is forming on Tuesday, December 9, 2025, over Rio Grande do Sul, bringing widespread rainfall, severe thunderstorms, and damaging winds across southern Brazil.
Large portions of the northern United States are under winter storm warnings as a strong Alberta clipper advances into the Upper Midwest and separate winter storms persist across the northern Rockies from Tuesday morning through early Wednesday, December 9-10, 2025.
A rapidly deepening Atlantic low, named Storm Bram, is forecast to pass close to the western coasts of Ireland, Northern Ireland and the Outer Hebrides on Tuesday, December 9, 2025, bringing very strong southerly winds, heavy rain and exceptionally high seas. The system forms part of an active North Atlantic storm train linked to recent Polar Vortex disruption.
Health complications are spreading in flood-hit in the provinces of North Sumatra, West Sumatra, and Aceh, as medical facilities face severe disruptions. Officials confirm 940 deaths and 276 people missing following Cyclone Senyar’s impact in Indonesia as of Sunday, December 7.
A small meteotsunami was observed along New Zealand’s East Coast and Lake Taupō last week as a strong weather system swept across the upper North Island, GeoNet reported on December 8, 2025.
A strong Alberta clipper will bring heavy snow and gusty winds to the northern Plains and Upper Midwest from Tuesday, December 9, through early Wednesday, December 10, 2025, prompting winter storm watches across multiple states.
Flood watches and warnings were issued across western Oregon and Washington on December 7, 2025, valid through December 12, as strong atmospheric river produces sustained rainfall, rising river levels and increasing landslide risk.
A major atmospheric river (AR4–AR5 possible) is forecast to make landfall over the Pacific Northwest early Monday, December 8, 2025, and persist through Wednesday, December 10, bringing multiple days of heavy rain and elevated snow levels. Ensemble guidance shows ~70–80% of members reaching at least AR4 in southern coastal Washington, with ~20–30% indicating AR5, raising the risk of widespread riverine flooding.
