• Major atmospheric river forecast to impact the Pacific Northwest with heavy rain and flooding risk

    ByRishav Kothari

    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.

  • Four atmospheric rivers forecast to bring heavy rainfall across the U.S. West Coast

    ByRishav Kothari

    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.

  • Back-to-back atmospheric rivers forecast to bring heavy rainfall and mountain snow to the Pacific Northwest and northern California

    ByRishav Kothari

    The Pacific Northwest will see back-to-back atmospheric rivers (ARs) beginning late Thursday, October 23, 2025, bringing significant precipitation and unsettled weather conditions through the end of October.The Weather Prediction Center has issued a Marginal Risk of excessive rainfall for coastal areas of Washington, Oregon, and northern California as the AR approaches.

  • Moderate-to-strong atmospheric river forecast to impact coastal Washington and Oregon, U.S.

    ByRishav Kothari

    An atmospheric river (AR) is expected to reach the Pacific Northwest (PNW) on Saturday, October 18, 2025, bringing heavy rain and elevated freezing levels above 2 400 m (8 000 feet) before lowering as the system moves east. 25–100 mm (1–4 inches) of rainfall is forecast over coastal Washington and Oregon, with orographic enhancement expected on the Olympic Peninsula and Northern Cascades.

  • Atmospheric river brings heavy rain to California and the Pacific Northwest

    ByRishav Kothari

    A Pacific storm and atmospheric river will impact the Pacific Northwest states and northern Rockies this weekend, bringing locally heavy low-elevation rain and heavy high-elevation snow in the mountains. By Sunday over the Interior Northwest, rain combined with snowmelt will increase the risk of flood hazards.

  • Bomb cyclone kills at least 2, leaves over 1.8 million without power in U.S. and Canada

    ByRishav Kothari

    A powerful, rapidly intensifying cyclone wreaked havoc across the northwestern United States and parts of Canada on Wednesday, November 20, 2024, causing at least 2 deaths and leaving more than 600 000 customers (approximately 1.5 million people) in the U.S. without power. Another 140 000 customers (approximately 335 000 people) were left without power in B.C., Canada.