Forecast discussion: We will be seeing a cornucopia of weather here in Boston over the next 24 hours. We began the day with some of the coldest temperatures of the winter season, as Logan Airport fell to 4 degrees at 5 a.m. Around 4 p.m. light to moderate snow began to fall across Southern New England. But, as we move through the overnight, we will see snow, freezing rain, sleet, and rain. The kitchen sink is the only thing we will not see.
At the moment, the cold air is slowly giving way to southerly winds and temperatures have risen to 30 degrees as of 7 p.m. But, it has remained cold enough for light snow to fall, starting around 4 p.m. in the capital city. The state of Massachusetts and the Islands are under a Winter Weather Advisory until 1 p.m. Sunday. As we move into the overnight, west of Boston will see 3-5 inches during the overnight. However, the totals will lower as you head south and east. This is due to another low pressure system from the Ohio River Valley, which will bring warmer air at the lower levels of the atmosphere. This will help change the precipitation from snow and sleet to freezing rain. This will begin around midnight, and move south to north. By 3 a.m., temperatures will be warm enough to make the precipitation fall as rain. Moderate to heavy rain is possible until 9 a.m., so streets may become flooded, as storm drains remain blocked with snow. Also, patchy fog is possible, as the warmer air moves over the snow packs. I am expecting 1-3 inches in Boston, with a coating to an inch for the Cape and Islands. For a snowfall map, click here.
Temperatures will not remain warm for very long. After the cold front passes through by the late afternoon, the mercury will plunge back down into the lower teens Sunday night. This will cause any puddles in the street and slush to re-freeze. So, please take extreme precaution for the morning commute on Monday, as there will be ice and black ice everywhere.
We will have dry weather into Tuesday evening, thanks in part to a strong high pressure system still in western Canada at the moment. But, this high will once again bring down another shot of polar air, as overnight lows Monday night fall back to near 5 below zero. Some sunshine Tuesday helps to increase our high temperatures near 20 on Tuesday. Increasing clouds from an Alberta Clipper system keeps lows temperatures Tuesday night into the lower teens.
Over the last two days, the computer models have been disagreeing on whether this Alberta Clipper or developing low off North Carolina would become our main weather feature. Well, it appears the models have come to a consensus. All the models now agree that the Alberta Clipper will pass through New England late Tuesday night into Wednesday. This means we will see light snow showers throughout the time period. So, we will see some added snowfall totals, but not to the extreme that a possible Nor’Easter was expected to give us earlier in the week.
Sadly, there appears to be no thaw ahead of us, even as we come to the end of February. A strong high pressure system will keep any low pressure systems developing in the Southeast U.S. from coming north. High temperatures will only be in the lower 20’s Thursday and Friday, with overnight lows in the middle single digits. We could see a weak cold front bring some light snow late next Saturday night.
72 hour forecast:
Tonight: Light to moderate snow beginning to mix with freezing rain around midnight, from south to north. Freezing rain will mix or change over to rain by 3 a.m. We will see a low of 31.
Sunday: Rain, moderate at times, will taper off through the morning. We will see a high of 36 with winds turning to the west-northwest at 5-8 mph. Patchy fog is possible by mid-morning. Drizzle is possible during the early afternoon.
Sunday night: Mostly cloudy skies and much colder with a low of 11. Winds will come from the west-northwest at 10-13 mph.
Monday: Mostly sunny with a high of 16.
Monday night: Partly cloudy and bitterly cold once again with a low of -4.
Tuesday: Mostly sunny during the morning, with increasing clouds during the afternoon. We will see a high of 20.
Tuesday night: Light snow showers by midnight with a low of 15.
Wednesday: Light snow showers end by 8 p.m. Highs 30-33, lows 9-12.
Thursday: Mostly sunny. Highs 21-24, lows 4-7.
Friday: Mostly sunny. Highs 20-23, lows 5-8.
Saturday: Partly sunny with possible light snow before midnight. Highs 25-28, lows 13-16.