Forecast discussion: After seeing a few days of bright sunshine, Boston was seeing overcast skies as a cold front moved through Southern New England. There were some passing snow showers over eastern Massachusetts, especially over the Cape and Islands. The snow will return after midnight, as moisture moves back up to Southern New England.
Currently, a low pressure system is forming over northeastern North Carolina. The low will move right along the boundary. We will begin to see some light snow showers after midnight. However the snowfall will not last very long. This is due to the frontal boundary being too far south to have a direct effect on us. The snowfall will leave Boston by the end of the morning commute, and will move completely out of the state before noon. Most of the capital city and metro area will only see a dusting to as much as 2 inches. Plymouth County will see 1-3 inches. Finally, the Cape and Islands will see the worst of it, receiving 2-4 inches. In fact, the Cape and Islands have a Winter Weather Advisory in effect until 12 p.m. on Monday. To view a map for yourself, I will take you to a local weather blog by clicking here.
After the snow, that high pressure system will once again bring dry weather. However, more Arctic air will return to the region. Temperatures Monday night will be about 20 degrees below normal. As the high moves east, a weak disturbance may bring a round of snow showers or squalls for a short period of time late Wednesday morning into the early afternoon.
We will remain dry going into the end of the week. However, I will be monitoring the models for the chance for some more precipitation for Friday or Saturday. A low pressure system will develop south of the Florida Panhandle and move northward. Due to southerly winds, temperatures will actually be above freezing by Thursday, and the lower 40’s by Friday. Right now, the American and European models are pushing the low offshore. But, the United Kingdom model keeps the low closer to the coastline, meaning we would see some precipitation. All the models agree that a weak cold front passes through us next Sunday, but I am not going to add any precipitation to the forecast. It appears there is not enough moisture in the upper levels to produce showers.
72 hour forecast:
Tonight: Cloudy with light snow developing after 1 a.m. A coating to a half inch is possible before dawn. We will see a low of 18.
Monday: Light snow tapers off north to south by 9 a.m., with the south coast seeing the most snowfall. Partly sunny skies are possible before sunset. We will see a high of 25 with north-northwest winds of 13-16 mph. Total accumulations of up to 2 inches in Boston, 1-3 inches in Plymouth County, and 2-4 inches along the Cape and Islands.
Monday night: Clearing skies by 10 p.m. and cold with a low of 8. Winds will come from the north at 7-10 mph.
Tuesday: Mostly sunny with a high of 26.
Tuesday night: Partly to mostly cloudy and a low of 18.
Wednesday: Partly to mostly sunny with possible snow showers in the late morning until the early afternoon. We will see a high of 29.
Wednesday night: Partly cloudy with a low of 17.
Thursday: Partly to mostly sunny. Highs 32-35, lows 20-23.
Friday: Mostly sunny to start, with increasing clouds through the late afternoon. Highs 40-43, lows 26-29.
Saturday: Partly sunny with possible rain showers. Highs 39-42, lows 25-28.
Sunday: Partly to mostly sunny. Highs 37-40, lows 27-30.