First of multiple atmospheric rivers to bring AR4 conditions and rising streamflows to western Washington
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.










