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Boston weather: Increasing clouds, but dry on Saturday

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Forecast discussion: Boston has been fortunate to see bright sunshine the last few days. The sunshine is due to a very strong area of high pressure, which is currently over central Indiana. In fact, the entire east coast is precipitation free at the moment.

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We will still see sunshine on Saturday, but some clouds will begin to advance over eastern Massachusetts through the afternoon. Despite the clouds, the high will still be controlling our weather into early Sunday. A weak area of low pressure, known as a trough, will come out of the Great Lakes late Sunday morning. It will meet up with some upper level dynamics, to help create a low pressure center in the Mid-Atlantic by the late afternoon. We will begin to see snow showers develop within noontime. However, this system is quite weak, compared to the other storms we have had this winter. We may see a coating of snow by Sunday evening. Light snow showers will continue through the evening, and end by Monday afternoon. The most snowfall I can see will be about an inch, mostly north and west of the capital city.

By Monday evening, Arctic air will reign back down into New England from Canada. Temperatures will be bitterly cold Tuesday night, with lows falling into the middle single digits. With cloudy skies Wednesday night, temperatures will rebound into the middle to upper teens. I am still watching a potential coastal storm for Thursday. However, at this time, it appears we will stay on the warmer side of the low. So, the precipitation will start off as snow showers, before changing or mixing with sleet and rain. The precipitation will change back to snow showers Thursday night, before ending Friday morning. At this time, the computer models are either keeping the low’s center near the coastline, or completely taking it out to sea. For now, my confidence in Thursday’s forecast is very low.

72 hour forecast:

Tonight: Clear skies and cold with a low of 13.
Saturday: Mostly sunny in the morning, with increasing clouds in the afternoon. We will see a high of 31. Winds will come from the west-northwest at 7-10 mph.
Saturday night: Mostly cloudy and a low of 18. Winds will come from the northwest at 4-7 mph.
Sunday: Overcast with light snow showers around 2 p.m. and a high of 30. A coating is possible by midnight.
Sunday night: Light snow with a low of 19.
Monday: Light snow showers ending by the early afternoon. Mostly cloudy skies expected the rest of the day. We will see a high of 27. A coating to a total of 1 inch is possible by Monday afternoon.
Monday night: Partly cloudy and bitterly cold with a low of 11.

Extended Forecast:
Tuesday: Mostly sunny. Highs 24-27, lows 6-9.
Wednesday: Mostly sunny. Highs 26-29, lows 15-18.
Thursday: Snow showers by the early afternoon, mixing or turning to sleet and rain. Highs 37-40, lows 27-30.
Friday: Light snow ends by the beginning of the morning commute. Partly sunny skies expected. Highs 38-41, lows 24-27.

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