Clues to the long-range weather pattern into mid-December
November 17, 2017; 9:13 AM
Despite some high latitude blocking, it appears that a strong, west to east flow of Pacific air will dominate across the western two-thirds of North America into December.
This west-east flow will deliver milder, Pacific air all the way into the Prairies as Arctic air gets cut off near the pole.
In the East, I do not see any sustained periods of cold weather either. However, there will still likely be some buckling of the jet from time to time that will allow some brief cold shots into the region from time to time.
The latest European weekly model, which much of this is based on, is having a difficult time figuring out the pattern in December due to a lack of strong signals. However, until we see some better signals, the idea of a stronger west-to-east Pacific flow is probably the way to go for now.
***As a general rule, long-range temperature departure forecasts have much better skill than long-range precipitation departure forecasts.
The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com