A surge of Arctic air is forecast to move south from the Northern High Plains on Friday, December 12, 2025, driving near-record lows and dangerous wind chills across the Northern Plains and Mid-South through the weekend.
Residents along the Skagit River in Washington have been ordered to evacuate as the river is forecast to reach 13.55 m (44.47 feet) by late December 11, 2025. Heavy rainfall and rising rivers have led to emergency declarations across Washington State.
A major atmospheric river is producing very heavy precipitation across western Washington today into early December 11, 2025, triggering widespread and potentially historic riverine flooding, according to the Center for Western Weather and Water Extremes (CW3E). Forecasts indicate 130–200 mm (5–8 inches) of rain over the central and northern Washington Cascades and 75–130 mm (3–5 inches) over the Olympic Peninsula through 04:00 PST (12:00 UTC) on December 12. CW3E modeling shows 15 river gauges expected to exceed major flood stage and four to surpass record levels within 48 hours.
At least 23 people have been reported injured due to the major M7.6 earthquake that struck Japan on December 8, 2025, prompting over 90 000 evacuations and alert for a potential mega quake.
A major earthquake registered by the Japan Meteorological Agency (JMA) and USGS as M7.6 struck off the east coast of Aomori Prefecture, Japan, at 14:15 UTC (23:15 JST) on December 8, 2025. Both agencies are reporting a depth of 50 km (31 miles). According to the Pacific Tsunami Warning Center (PTWC), hazardous tsunami waves are possible within 1 000 km (620 miles) of the epicenter.
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 G3 – Strong geomagnetic storm watch is in effect following a powerful M8.1 solar flare from geoeffective Active Region 4299 at 20:39 UTC on December 6, 2025. The resulting full-halo coronal mass ejection (CME) is expected to impact Earth between early and midday UTC on December 9, possibly producing periods of strong geomagnetic storming.
A strong and shallow earthquake registered by the USGS as M7.0 struck near Yakutat, Alaska, at 20:41 UTC on December 6, 2025. The agency is reporting a depth of 10 km (6.2 miles). EMSC is reporting M6.8 at a depth of 10 km. According to the National Tsunami Warning Center (NTWC), there is no tsunami danger from this earthquake.
A strong solar flare measuring M8.1 erupted from Active Region 4299 at 20:39 UTC on December 6, 2025. The event started at 20:29 and ended at 20:49 UTC. A full-halo coronal mass ejection was produced, with impact expected early to midday on December 9, potentially causing periods of G3 – Strong geomagnetic storming.
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.
