All Weather News

December Outlook – Colder North, Wetter South

2 Dec 2016, 7:55 pm

The National Weather Service’s Climate Prediction Center recently issued its updated December forecast across the country.  The trend from earlier forecasts has not changed: colder than average weather in much of the Northern and Western U.S., with welcome above average precipitation in the South and Southeast. The Northeast is expected to be warmer than normal.

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The presense of La Nina is the main reason for the change from the weather felt this past Autumn. La Nina occurs when the waters of the Pacific Ocean show a general trend of cooling, the opposite of an El Nino. During La Nina periods, the Jet Stream is less active in the Southern U.S. This usually leads to less storms systems and below average precipitation. Cooler than normal weather typically occurs across the northern tier of the country and occasionally wetter periods as well.

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The pattern is expected to shift slightly at the end of December with a less pronounced pocket of cold air in the north, and drier conditions returning to the south. This is according to the experimental 3 and 4 week forecasts from the Climate Prediction Center.

Earlier in November, the Winter Outlook was issued. Temperature trends are expected to be above average across the South, with drier than normal conditions expected as well. The Northern U.S. is forecast to be wetter and cooler than average.

For WeatherNation: Meteorologist Mace Michaels

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