Forecast discussion: Boston has enjoyed a remarkable streak of above average temperatures for the last several days. In fact, the capital city reached 52 degrees on Sunday. Unfortunately, this mild weather is heading south. Also, we have the chance at two weather systems bringing back some snow.
A frontal boundary has passed to our east, and this system is what will help usher back the colder air from Canada. A weak disturbance will pass through later tonight, helping to trigger some precipitation. It will begin as rain showers before mixing and then changing to snow showers. The precipitation will not last long, as it will shut off by the start of the morning commute on Monday. But, a coating to an inch on the ground is expected. There is a slight chance parts of Plymouth County will see 2 inches, due to some snow bands training, or continuously moving over the area. So, just take extra time to make it to work or school in the morning.
Winds will also increase Monday afternoon, as the high pressure ridge builds back over the area. It will continue to give us dry, cold weather into Tuesday night. As we move into Wednesday, old man winter is going to return. A low pressure system developing off the coast of North Carolina, coinciding with a weak low over New York will help bring significant snowfall. At this time, it appears the Cape and Islands will see the heaviest snowfall totals, and that could be 3-6 inches at this time. However, if the low continues to move further out to sea, then the snow totals will go down.
All snowfall will end by the early evening, and then temperatures will plummet. Some areas north and west of Boston will see temperatures Wednesday night fall into the single digits, with winds chills at or below zero. Temperatures during the daytime will be well below normal, and we will not even reach freezing. By the weekend, a disturbance passing to our south at the surface will combine with moisture coming off the Great Lakes. On Saturday, with a low moving south of the region, the precipitation will make its way into Southern New England. We will see more light to moderate snow Saturday afternoon, before ending early Sunday morning. With the help of fresh snowfall and Arctic air, temperatures will only reach the upper teens for highs, and lows falling into the middle single digits.
72 hour forecast:
Tonight: Mostly cloudy with isolated rain showers by 11 p.m. changing to snow showers after 3 a.m. We will see a low of 29 with increasing winds.
Monday: Mostly cloudy and windy with snow showers ending by mid-morning. Mostly sunny skies expected the rest of the day. It will be colder with a high of 33. Total snowfall amounts will be a coating to an inch. Winds will come from the west-northwest at 16-19 mph.
Monday night: Partly cloudy with a low of 19. Winds will come from the west-northwest at 13-16 mph.
Tuesday: Mostly sunny with a high of 29.
Tuesday night: Mostly cloudy with a low of 19.
Wednesday: Cloudy with light to moderate snow showers by the late morning, and ending by the early evening. We will see a high of 29.
Wednesday night: Partly cloudy and cold with a low of 11.
Thursday: Mostly sunny skies. Highs 25-28, lows 11-14.
Friday: Mostly sunny. Highs 26-29, lows 14-17.
Saturday: Cloudy with light to moderate snow starting by the early afternoon. Highs 26-29, lows 9-12.
Sunday: Snow ends by 2 a.m. with mostly sunny skies. Highs 18-21, lows 5-8.