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Boston weather: Snow and rain for Sunday

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Forecast discussion: Thanks to high pressure on Saturday, Boston received another day of bright sunshine mixed in with some high clouds. Unfortunately, the high will be moving off of North and into the Atlantic during the overnight. It will be replaced with a cold front that will begin to settle just over the region on Sunday, before moving to our south during the afternoon.

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We will not see the first snowflakes until Sunday morning. Along the front moisture from the Great Lakes and Gulf of Mexico will provide us with light snow showers. Along the Cape and Islands, however, the precipitation may mix with or change over to rain. However, everyone returns to all snow showers by Sunday evening. For snowfall amounts, it appears the computer models agree that the boundary will stay further south than originally forecasted. So, the snow will not be staying as long as we thought on Monday. It appears that by the start of the evening commute, any snowfall will be just around the south coast. All precipitation will end by 7 p.m. with clearing skies before midnight. It looks like just 1-3 inches will fall in Boston, with 2-4 inches right along the Cape and Islands. From there, a strong Arctic front will bring colder air back over the region. To see a snowfall map, I’ll take you to a local weather blog by simply clicking here.

Temperatures for the middle of the week will remain well below normal, especially for the first full week of March. However, we will see our winds shift to the south by Thursday. A weak disturbance may even create some isolated snow showers for a small period on Wednesday. By then, high pressure will bring nice weather for Thursday. By Friday, we will actually see temperatures reach 40 degrees. There is also the small chance a low pressure system riding along the east coast will being rain showers during the day, before changing to some snow showers. If not, a secondary low coming off the Great Lakes may provide us with some snow showers next Saturday evening.

72 hour forecast:

Tonight: Partly to mostly cloudy skies with a low of 27.
Sunday: Some flurries around 5 a.m., with light snow showers around 9 a.m. There will be a mix of rain and snow showers from 1 p.m. until 7 p.m. along the Cape and Islands. We will see a high of 34 with winds turning to the north-northwest at 5-8 mph.
Sunday night: All precipitation changes back to light snow by 7 p.m. with a low of 18. Winds will come from the northwest at 8-11 mph.
Monday: Light snow may taper off to flurries during the early morning. We return to light snow by mid-morning, and continue until the end of the afternoon. We will see a high of 24.
Monday night: Clearing skies by 10 p.m. and cold with a low of 9. I’m expecting 1-3 inches in Boston, with 2-4 inches along the Cape and Islands.
Tuesday: Mostly sunny with a high of 25.
Tuesday night: Partly to mostly cloudy and a low of 14.

Extended Forecast:
Wednesday: Partly to mostly sunny with possible snow showers from the morning to early afternoon. Highs 23-26, lows 9-12.
Thursday: Mostly sunny. Highs 30-33, lows 20-23.
Friday: Mostly sunny. Highs 38-41, lows 27-30.
Saturday: Mostly cloudy with possible snow showers by the evening. Highs 40-43, lows 29-32.

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