Forecast discussion: This was one of the brightest days of the week in Boston today, as high pressure in the Atlantic brought sunshine during the morning. However, some mid-level clouds began to form. This cloud cover was ahead of a warm front now just making its way into northern New York. The front will help increase our temperatures during the overnight, as we await some rainfall on Thursday.
The precipitation will begin by the afternoon, as some scattered showers arrive over eastern Massachusetts. The heavier precipitation arrives by the evening, as we move through the early morning hours of Friday. Moderate rain is possible at times during the afternoon, and temperatures will increase into the lower 50’s. As we head into Friday night, the cooler temperatures will help change the rainfall over to some wet snow before midnight. The ground will be too warm for any accumulations. The wet snow will change back to rain before precipitation ends on early Saturday afternoon. We will see some sunshine before sunset. Temperatures will also decrease on Saturday, as some colder air behind the front works its way into New England. The temperatures on Sunday will be about 5 degrees colder than normal, with increasing clouds by the late afternoon. By Sunday night, a real weather threat moves over Southern New England.
A low pressure system will develop over Tennessee Sunday, with a secondary low forming to the east. At this time, the warm front will be too far east to keep the precipitation we are expecting late Sunday night to remain as rain. So, the colder air will help start the precipitation as some snow. But, as we move through early Monday morning, some warmer air will convert the snow to a mix of sleet and freezing rain. So, the morning commute may become treacherous, so please take extreme caution. By the late morning, the wintry mix will change to all rain, as temperatures warm into the lower 40’s. There will be enough warm air to keep the precipitation as showers into Monday evening, before showers end early Tuesday afternoon. The cold front from this system will pass, with a strong high pressure system giving us bright sunshine next Wednesday. However, temperatures will be cold, as our high temperatures will be near freezing.
72 hour forecast:
Tonight: Mostly cloudy with some drizzle before dawn and a low of 35.
Thursday: Scattered showers arrive before noon and milder with a high of 52. Winds will come from the south-southeast at 7-10 mph.
Thursday night: Showers with light to moderate rain at times and patchy fog with a low of 48. Winds will come from the south-southwest at 8-11 mph.
Friday: Overcast with light to moderate rain and a high of 55.
Friday night: Showers/light rain before changing over to wet snow before midnight. It will become colder with a low of 34.
Saturday: Snow changes to rain by mid-morning before all precipitation ends by the afternoon, with partly cloudy skies expected by the late afternoon. We will see a high of 39.
Saturday night: Partly cloudy with a low of 25.
Sunday: Partly sunny during the day, with overcast skies in the evening with snow beginning around 9 p.m., but mixing with sleet/freezing rain after midnight. Highs 34-37, lows 27-30.
Monday: Sleet/freezing rain changing to all rain by late morning, with showers through the overnight. Highs 42-45, lows 33-36.
Tuesday: Showers ends in the early afternoon. Highs 37-40, lows 21-24.
Wednesday: Mostly sunny. Highs 30-33, lows 15-18.