Pattern Flip

After a run of very mild weather in October – which pushed the month to the top of the charts as warmest on record at Hyannis (and second warmest at Boston) – the weather pattern became more seasonable during the month of November. A lengthy stretch of chilly weather during mid-month ensured that November will close out at or below normal temperature-wise across most of Southern New England, despite a return to somewhat milder conditions of late.

As we flip the calendar to December we can expect a continuation of seasonable weather for the time being. Short-lived bouts of cool weather will battle with equally as brief episodes of milder conditions for the first week of the month. However…a major change is in the works…

A large upper level ridge is going to take shape over western portions of North America in the coming week and build northward through northwestern Canada and Alaska, eventually causing upper air heights to rise through the Arctic Circle. The result of the strong west coast ridge will be a sizable downstream trough over the eastern half of North America. That trough will funnel air from the far northern latitudes southward into Canada and across the eastern half of the Lower 48 states.

With that in mind, we will see a transition to much colder weather here in New England in about a week’s time, with the possibility of a several day stretch of (well?) below normal temperatures taking hold after about the 8th of the month…with the general weather pattern being a much more wintry one. Stay tuned.

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