November 29 - Long Range Summary
Above average warmth which predominated the majority of the West and northern Plains throughout November is quickly expanding eastward, with the Northeast last to shift warm. A cold start to the coming week across the Northeast featuring temperatures 5° below average is certain to briefly reverse 5° above average midweek, before cold air returns at the end of the week. All models prolong this modest volatility across the Northeast characterized by near seasonal mean temperatures when averaged over several day time scales through the end of the 1st full week of December. Extended range models eventually flood the Northeast with milder air during the 11-15 day period, but this accompanies large scale pattern change directing notably colder air through west central Canada into the Rockies and Plains. Central U.S. cooling forecast to start late in the 6-10 day period may not mark onset of sustained below average temperatures. However, that is not the case across Canada where progressive cooling sets the stage for significantly colder mid December conditions across the northern Plains and Upper Midwest, which are likely to expand into the East by the final week of the month to persist through early January.
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