A weak La Niña is projected to influence the upcoming meteorological winter, which spans from December through February. While it will not determine the entire seasonal temperature pattern, it is expected to have notable effects on various regions of the United States.
Winter Outlook: La Niña’s Effects
The coldest temperatures are anticipated in the Northwest, Northern Rockies, and Northern Plains, particularly from Washington to North Dakota. In contrast, much of the South, including areas from the Desert Southwest to Florida, is predicted to experience warmer-than-average conditions.
January Temperature Trends
- Geographical Temperature Predictions:
- Colder-than-average: Northwest, Northern Rockies, Northern Plains.
- Warmer-than-average: South and East, including the Northeast and Great Lakes.
The central and eastern Gulf Coast, along with Florida, is also expected to have drier conditions typical of La Niña winters. In December, colder weather is likely at the season’s start, especially across the Northwest and the Ohio Valley. This is influenced by La Niña, combined with a weakening polar vortex high in the stratosphere. Regions like the Upper Midwest and Northern Plains may experience significant cold as the jet stream dips southward.
Monthly Breakdown of Winter Weather
December
December might present a sharp contrast to weather patterns expected in later months. A chill could grip areas from the Northwest to the Ohio Valley, while warmer conditions are forecast for the Southwest and Gulf Coast.
January
In January, a significant increase in temperatures is predicted for the eastern United States, particularly in the Great Lakes and Ohio Valley. This region could shift from colder-than-normal to much warmer temperatures. Meanwhile, the Northwest and Northern Rockies are forecast to remain cooler than average. However, the potential for sporadic colder snaps exists, particularly as cold air moves from the Rockies into the Plains.
February
February is likely to continue a milder-than-average trend for the South and East, while colder air retreats to the Northwest. Despite the prevailing milder conditions, fluctuations may lead to cold air surges from persistent cold pockets in the Northwest and western Canada into neighboring areas.
Understanding La Niña’s influence is crucial for anticipating weather trends this winter. The temperature and precipitation variations will vary significantly across the country, guiding preparedness for winter conditions.
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