Major atmospheric river forecast to impact the Pacific Northwest with heavy rain and flooding 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. #weather #AR #Northwest
https://watchers.news/2025/12/06/major-atmospheric-river-forecast-landfall-pacific-northwest-december-8-2025/










