PM Update: Plenty of sun, low humidity

The sun is setting this evening on a gorgeous late-summer day (or early autumn if you’re using the meteorological calendar), and the main change in terms of sensible weather has been the drop in humidity. The past several days had featured rising dew points and increasing clouds with unsettled weather. But a cold front which moved through on Tuesday set the stage for a gorgeous Wednesday — and a persistent pleasant pattern which looks to settle into the area over the next several days. Light westerly winds and clear skies were the theme Wednesday, and look to be the theme through the weekend. A reinforcing shot of cold air, arriving just ahead of a mid level atmospheric disturbance on Thursday, will make things borderline chilly on Friday morning.

NAM model showing forecast low temperatures from Thursday Night into Friday morning. Upper 30’s and 40’s are common in the suburban areas of New England.

Forecast models show a disturbance moving through New England from Thursday into Friday, dragging a cold front south of our area into the Mid-Atlantic. The airmass from Canada which it brings along for the ride will only graze the area for a brief time, but 850mb temperatures will fall to the single digits (near zero in New England) with clear skies and light winds expected Thursday into Friday. Accordingly, forecast models show low temperatures falling into the 40’s in the interior suburbs, and 30’s in parts of New England.

Daytime highs on Friday could struggle to reach the lower 70’s — so it will certainly be feeling more like Autumn. Things recover a bit into the weekend, but the general theme of pleasant conditions with temperatures in the 70’s and perfect sleeping weather overnight will continue.