December 11 - Long Range Summary
Cold temperatures extending deep into the Southeast early this week in the wake of the recent historic southern snow event are certain to be followed by an even colder arctic airmass focusing farther north across the northeastern quadrant of the country by Wednesday at near 15° below average intensity. Models begin to diverge late week with intensity of warmer air spreading out of the Western half of the country into the East through early next week, but even the warmest 6-10 day forecasts shift markedly colder by the 11-15 day period. The coldest forecasts of the European model and 30-day MWA ensemble re-establish a similar amplified pattern as currently in place setting the stage for a frigid Christmas week across the Midwest and East, and are accepted as indication of an even colder start to January than previously anticipated.
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