June 15, 2021

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12:30 PM (Tuesday) | *The overall weather pattern becomes quite interesting for the central and eastern US after we flip the calendar to December* — Perspecta Weather

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In addition to the computer forecast models, there is also some support for the formation of a colder and stormier weather pattern in the central and eastern states by teleconnection indices such as the Pacific-North American (PNA), Arctic Oscillation (AO) and North Atlantic Oscillation (NAO).  When the PNA goes “positive” this time of year and the NAO/AO go into “negative” territory, the result is often a colder and stormier weather pattern for the central and eastern states. Furthermore, there is some correlation between a highly active October and November with respect to tropical activity in the Atlantic Basin and a colder-than-normal month of December in the central and eastern US.  An average temperature anomaly for the month of December following five fall seasons with high tropical activity shows colder-than-normal conditions in the eastern half of the nation (Credit Joe Bastardi, Weather Bell Analytics).

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