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Boston Weather: 40.0°F | A Few Clouds and Breezy

Weather

WWW: Wicked Windy Weekend

By Cegeon Chan
STAFF METEOROLOGIST

Feel a chill in the air? The intensifying low pressure system making its way through Boston will usher in an abnormally cool air mass and, unfortunately, it is here to stay. Yesterday’s high temperatures in the mid 60s F will likely not be reached again in the next couple of weeks. In fact, for most of the eastern half of the United States, below-average temperatures are forecasted for the next two weeks.

What can explain this pattern and how can we be so certain? There is a robust pattern called the Arctic Oscillation (AO) that describes a seesaw

of mass between the mid-latitudes and the polar regions. When there is a ring of anomalously low pressure in the mid-latitudes, an accompanying

ring of anomalously high pressure occurs in the polar regions. This consequently displaces the jet stream southward, allowing cooler air masses to persist in Boston.

On top of the cooler temperatures, expect windy conditions for the next couple of days. Any late night partiers tonight will be contending with wind gusts up to 50 mph. Although sunny skies are expected when the storm exits tomorrow, windy conditions will continue through tomorrow night. Therefore, Sunday will be the better of the two days, as winds finally subside.

Extended Forecast

Today: Light rain showers, heavier in the afternoon. Increasing winds. High 64 F (18 C).

Tonight: Much cooler, windy with gusts up to 50 mph. Low 39 F (4 C).

Tomorrow: Mostly sunny with winds 15 to 20 mph. High 59 F (15 C).

Tomorrow night: Mostly clear, winds 10 to 15 mph. Low 39 F (4 C).

Sunday: Mostly sunny. High 59 F (15 C).