Brett Anderson

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Long-Range Outlook Into Mid-December

November 15, 2013; 9:59 AM ET

The long-range weeklies are getting closer to the Christmas holiday and the central theme of what they are showing for the first half of December is that the Rockies into the Prairies will be colder than usual.

There is a high level of uncertainty in the East, especially in the precipitation department (not unusual), while the overall pattern seems to favor a drier regime along the West Coast.

The Arctic Oscillation (AO) is extremely positive right now, which usually does not translate to the unseasonably cold weather that we have seen in the eastern two-thirds of the U.S. and parts of southern Canada lately. However, the pattern across North America over the next five days will be more typical +AO with a strong west to east, zonal jet stream flow which allows Pacific air to weep across southern Canada and the U.S.

The AO is predicted to trend more neutral over the next week and possibly more negative toward the end of the month, which could eventually help send the Arctic cold back down into the central and east areas, despite what the weekly long-range models say.


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Brett Anderson
Brett Anderson covers both short-term and long-term weather and storm forecasts for Canada in this blog for