There is a strong tendency for amplified broad-scale upper-level high-pressure ridge areas to form across and downwind MWH episodes. No exception is the exposure South America has to this phenomenon as meteorological summer 2022-23 has produced a titanic upper-level ridge east of Argentina extending across Argentina to cause drought in that country and aggravate long-term drought in Chile.

The core of an arctic air mass moving toward South-central Canada today will move east-southeast and into New England with limited, if any moderation. The coldest point of the arctic air presence across the Northeast is around 5AM Saturday morning. At that time, Boston could plummet to -16F, Portland, ME -24F, and Burlington, VT -30F.

A much colder forecast as a vigorous upper trough across and to the east of the Black Sea region generates a chill that propels night temperatures into the 10-15F range at night in Ukraine and into Eastern Europe.

An exceptionally mild winter 2022-23 for New England but a brief period of arctic air visits later next week possibly for about 5 days. During that time Boston maximum temperatures could stay below freezing for up to 5 days including at least one night in the single digits.