According to the National Oceanic and Atmospheric Administration Climate Prediction Center, a series of powerful atmospheric rivers is bringing heavy rain, mountain snow, flooding, and high winds to the Pacific Northwest and California, with a risk of landslides and river flooding from northern California into Washington state. Forecasters say a cool phase of the tropical Pacific known as La Nina is likely to persist for the next month or two before shifting toward neutral conditions early next year, a pattern that can influence storm tracks, drought risk, and temperature extremes across the United States.
The Washington Post reports that this storm sequence is hitting landscapes already stressed by long term warming, with higher snow lines in the Sierra Nevada and Cascades, meaning more precipitation is falling as rain instead of snow. This raises winter flood risk while shrinking the natural snowpack reservoir that western states depend on for summer water supplies. In Oregon and Washington, local officials are warning that saturated soils after a warm fall could increase tree fall and power outages as winds intensify.
In the eastern United States, the Associated Press notes that unusually warm December temperatures have extended the growing and allergy seasons in parts of the Midwest and Northeast, a trend scientists link to long term climate warming. Cities from Minneapolis to Boston are reporting that the first lasting snows are arriving later than in past decades, disrupting winter recreation economies and complicating water management planning.
Worldwide, the European Union climate service Copernicus reports that global temperatures over the past year have remained near or above one and a half degrees Celsius of warming compared with the late eighteen hundreds baseline, driven largely by record high ocean temperatures in the North Atlantic and other basins. The Guardian notes that heat driven drought in the Amazon and in parts of southern Africa has intensified wildfire risk and strained hydropower production.
Across these stories, scientists emphasize a common pattern. A warmer atmosphere holds more moisture, making heavy precipitation events like the current West Coast storms more intense, while also driving hotter heat waves, longer wildfire seasons, and shifting snow and rainfall patterns that challenge water systems and communities across the United States and around the world.
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