• Atmospheric river targets Pacific Northwest as Tropical Storm Marie boosts California rainfall risk

    ByRishav Kothari

    An early-season atmospheric river associated with a potent upper-level closed low is forecast to bring 25–75 mm (1–3 inches) of precipitation to parts of the western United States through 05:00 PT (12:00 UTC) on September 5, 2026. The Weather Prediction Center (WPC) placed interior northern California, eastern Oregon, and western Idaho under a Marginal Risk of excessive rainfall for September 3–4, while Marie-related moisture raised a separate, more uncertain California rainfall risk later in the forecast period.

  • Prolonged atmospheric river brings Flood Watch and high avalanche danger to British Columbia as some areas face up to 400 mm (15.7 inches) of rain

    ByTeo Blašković

    A prolonged atmospheric river is affecting British Columbia this week, with Flood Watch, multiple rainfall warnings, and Special Weather Statements in effect across parts of the province. Some coastal areas could receive up to 400 mm (15.7 inches) of rain, while heavy rain on existing snowpack is increasing the risk of flooding, washouts, landslides and dangerous avalanche conditions.

  • Atmospheric river forecast to stall over Washington, raising flood risk through March 20

    ByRishav Kothari

    A stalled atmospheric river over the Pacific Northwest is forecast to deliver 127–254 mm (5–10 inches) of precipitation to parts of Washington between March 17 and 20, 2026. High freezing levels above 2 100 m (7 000 feet) will result in rainfall across most elevations, accelerating snowmelt and increasing the likelihood of riverine flooding.

  • Snowstorm causes spinouts and closure of I-90 at Snoqualmie Pass, Washington

    ByRishav Kothari

    Heavy snowfall caused multiple vehicle spinouts and crashes on I-90 at Snoqualmie Pass in Washington, forcing authorities to close the highway in both directions on March 13 and keep it closed overnight into March 14, 2026. Snoqualmie Pass received about 56 cm (22 inches) of new snow overnight, while the Summit at Snoqualmie reported about 107 cm (42 inches) over 48 hours during the storm.

  • Long-duration atmospheric river impacts Washington and Oregon with heavy rain, snow and flood risk, U.S.

    ByRishav Kothari

    An atmospheric river made landfall in the Pacific Northwest during the morning of March 11, 2026, bringing heavy rain and snow across portions of Washington and Oregon. Forecasts show that the event will continue affecting the region through early March 14, producing significant precipitation totals, flooding concerns, and major winter weather impacts in mountainous terrain.

  • Atmospheric rivers forecast to bring heavy rain and snow to the Pacific Northwest through mid-March

    ByRishav Kothari

    Two atmospheric rivers are forecast to hit the Pacific Northwest beginning late March 10, 2026, bringing heavy rainfall to coastal areas and significant snowfall to higher elevations in Washington and Oregon. Precipitation totals of 180–380 mm (7–15 inches) are forecast in mountainous regions, with the potential for river rises and localized flooding through the week.

  • Coastal storm and long-duration atmospheric river to bring heavy precipitation to Pacific Northwest and California

    ByTeo Blašković

    A slow-moving low-pressure system is forecast to bring long-duration atmospheric river conditions to the U.S. West Coast between Saturday, February 21, and Wednesday, February 25, 2026, delivering heavy precipitation from Washington to California. The strongest impacts are expected across southern Oregon and northern California Coast Ranges and the Klamath Mountains, where 5-10 inches (125-250 mm) of rain is forecast.

  • Atmospheric river forecast to bring another round of heavy precipitation to California

    ByTeo Blašković

    Atmospheric river associated with a slow-moving low-pressure system is forecast to impact California between February 21 and 26, 2026, bringing another round of heavy precipitation to the state. The Center for Western Weather and Water Extremes (CW3E) indicates very high confidence (>90%) in atmospheric river conditions along northern California through February 23, with moderate-to-high confidence of the AR conditions shifting south along the coast by February 24.

  • Pair of mid-level troughs forecast to bring widespread precipitation to California

    ByRishav Kothari

    Two mid-level troughs with associated surface lows are forecast to bring widespread precipitation to California between February 14 and 19, 2025. The first system is forecast to begin affecting the state on February 14–15, followed by a second trough deepening offshore from February 16–17. Snowfall totals over the Sierra Nevada could exceed 60 cm (24 inches), while rainfall totals of 25–50 mm (1–2 inches) are forecast across much of the state during the initial 72-hour period.