Forecast discussion: After several days of discussing it, the snow finally arrived during the early afternoon. Right now, the National Weather Service has issued three advisories for eastern Massachusetts. Boston has a Winter Storm Warning in effect until 1 p.m. Sunday afternoon. The area between Brockton to Plymouth is under a Winter Weather Advisory, until 7 a.m. Sunday. Finally, the Cape and Nantucket Island is under a High Wind Warning. During the overnight hours, winds will increase to 20-30 miles per hour.
The low pressure system is currently over Ohio, with a secondary low forming over western South Carolina. The snowfall will begin to come down a little heavier by about 10 p.m., and there may be times where it is falling at about 1-2 inches an hour.
By 2 a.m., we will begin to see warmer air move over the state. The secondary low will become the primary low by this time, as it moves over Long Island, NY and right over central Rhode Island. We will see a mix of freezing rain and rain east of Boston, while the city stays under sleet and snow. By 4 a.m., the whole area will see rain, with showers ending by mid-morning. Also, we will see partial sunshine in the afternoon, making temperatures rise into the lower 40’s. I am expecting 5-8 inches in the capital city once the storm comes to an end. The area between Brockton and Plymouth will see 3-6 inches, with the Cape and Islands seeing 2-4 inches.
We will see mostly sunny skies on Monday, thanks to high pressure ridging. Any snowfall on the ground will help lower temperatures into the lower teens. By Tuesday, an Alberta Clipper will bring some snow showers by the afternoon. At this time, it is possible to see a few inches by Wednesday morning.
We will see dry weather into Thursday, but we will be seeing another weekend storm, starting by Friday evening. However, the difference with this storm is we will have warmer air coming in from the south. Temperatures will be in the middle 40’s for the day, and staying above freezing during the overnight hours. However, colder air will move in once the cold front passes through during the afternoon. In fact, the precipitation may end as some wet snow.
72 hour forecast:
Tonight: Moderate to heavy snow by 10 p.m., and continuing through about 2 a.m. Snow will mix with sleet from 2 a.m. until a changeover to rain by 4 a.m. We will see a low of 26 at midnight, as temperatures rise through the night.
Sunday: Showers/drizzle end by noon with partly sunny skies by the afternoon. We will see a high of 41 with west-northwest winds in the afternoon of 14-17 mph.
Sunday night: Partly cloudy and breezy with a low of 18. Winds will come from the west at 14-17 mph.
Monday: Mostly sunny with a high of 25.
Monday night: Mostly cloudy after midnight and a low of 10.
Tuesday: Overcast with snow showers by the afternoon. I’m expecting a high of 30.
Tuesday night: Scattered snow showers with a low of 22.
Wednesday: Scattered snow showers through the morning, but becoming partly sunny by the afternoon. Highs 33-36, lows 20-23.
Thursday: Mostly sunny. Highs 33-36, lows 24-27.
Friday: Overcast by the early afternoon with rain showers by the evening. Highs 44-47, lows 36-39.
Saturday: Rain/showers in the morning, with precipitation possible ending as snow showers/flurries in the evening. Highs 44-47, lows 30-33.