Forecast discussion: Thanks to a high pressure system gliding over western Pennsylvania, Boston received some bright sunshine Saturday morning. However as we moved through the mid-afternoon, clouds began to increase over the skies. This was due to a weak disturbance south of Cape Cod, which brought some ocean effect snow showers. Eastern Massachusetts did not see any precipitation, as the moisture moved off to the east.
We will remain under cloudy skies for Saturday night, as the high weakens and dissipates. As we go through Sunday morning, a weak area of low pressure moving out of the Great Lakes will gain some strength. By Sunday afternoon, the disturbance will form a weak low pressure center. The low will pick up moisture off the Great Lakes, and help to bring some snow showers into Southern New England. The strongest snow showers will be during Sunday evening and end by the middle of Monday morning. I am only expecting less than a coating in some areas, while the Boston area will see about 1-2 inches. If there is a moderate snow band during the evening, some isolated spots may receive up to 3 inches.
By Monday evening, a strong high pressure system coming down into the Rockies will move over the Central U.S. We will see sunny conditions, but once again Arctic air will give us well below normal temperatures. By Tuesday night, temperature will barely remain in the double digits. However, by Wednesday night, some high level clouds will help keep temperatures in the upper teens.
As we look to the end of the week, the computer models continue to go back and forth with a possible coastal storm. However, it appears that the timing has changed. Now, it appears many computer models keep the low from moving up the east coast until early Friday morning. So, we will not see any precipitation until early Friday morning. At this time, the precipitation will be a mix of sleet and snow going into Friday morning, before temperatures are so warm, the precipitation changes over to rain. We will also see some melting, as temperatures remain above freezing for Thursday and Friday. By Friday night, the precipitation will change back to snow showers, before the precipitation shield moves into the Atlantic early Saturday morning. A weak area of high pressure will give us limited sunshine by next Saturday afternoon. But, temperatures will be slightly above normal for this time of the year.
72 hour forecast:
Tonight: Mostly cloudy with a low of 19.
Sunday: Overcast with light snow showers around 4 p.m. and a high of 30. A coating is possible by midnight. Winds will turn easterly at 4-7 mph.
Sunday night: Light snow showers with a low of 22. Winds will turn to the west-northwest at 7-11 mph by 4 a.m.
Monday: Light snow showers ending by mid-morning. Mostly cloudy skies expected the rest of the day. We will see a high of 30. About 1-2 inches is possible by Monday afternoon, with the highest snowfall north and west of Boston. Isolated areas could see 3 inches.
Monday night: Partly cloudy and very cold with a low of 13.
Tuesday: Mostly sunny with a high of 25.
Tuesday night: Partly cloudy and bone chilling cold with the mercury falling to 10 degrees.
Wednesday: Mostly sunny. Highs 26-29, lows 17-20.
Thursday: Mostly cloudy with sleet and snow after midnight. Highs 38-41, lows 27-30.
Friday: Windy with wintry mix changing to rain in the day. Precipitation will end as snow showers early Saturday morning. Highs 40-43, lows 25-28.
Saturday: Partly to mostly sunny. Highs 36-39, lows 22-25.