Last week, the Climate Prediction Center (CPC) issued their outlook covering the 90 day period from November to January. Warm readings are expected across most of the nation, with above average temperatures in the forecast from the Eastern Seaboard across the nation to the Southwest. Drier than normal weather is forecast for the South and Southeast, with above average precipitation in the northern Rockies.
— NWSCPC (@NWSCPC) October 19, 2017
The CPC has been watching for a La Nina for several months, with the first mention in August. La Nina brings colder than average water temperatures to the Pacific Ocean – the opposite of an El Nino. So far, those conditions have yet to develop. Due to the lack of cooler Pacific sea-surface temperatures, this outlook delayed the typical climatological trends that occur when a La Nina is in progress.
A La Nina in the fall and winter usually brings colder and wetter weather to the Northwest, along with dry and mild conditions from the Southwest to the Southeast. The Upper Midwest and Northeast tend to see below average temperatures.
The Winter outlook was issued by the CPC at the same time, covering December to February. There were several similarities between the two forecasts, especially the warm and dry conditions forecast across most of the South.
For WeatherNation: Meteorologist Mace Michaels