Winter Outlook: Less Cold, More Shifts Ahead

A mid-November stratospheric warming event brought widespread snow and sharply colder temperatures to Canada and the north-central and eastern United States. The event displaced the polar vortex, pushing frigid Arctic air south, though forecasters say the impact is now waning. The polar vortex is expected to return to its normal position near the North Pole by the end of December, allowing other weather patterns, including La Niña, to have more influence. World Weather Inc. notes that La Niña typically brings below-normal temperatures to western Canada and the north-central U.S., while suppressing precipitation in the southern U.S. and increasing rainfall in the Pacific Northwest and parts of the Midwest and Atlantic Coast. Cold conditions will largely retreat into western Canada, though some temporary impacts may still occur across the northern Plains and Pacific Northwest. Looking ahead, La Niña is expected to weaken or dissipate in January, potentially altering weather patterns again. A second stratospheric warming or displaced polar vortex could occur later this winter, bringing renewed cold to eastern North America and limiting precipitation in the Midwest and Great Plains. Spring may see increased rainfall in the Plains and western Midwest.