Metro Boston, north shore and metro west: A cold front slides through the area today moving offshore by this evening. Outside of the chance of a spot shower or two the front moves through with little notice, except for the considerable cloudiness it produces throughout our Sunday. Ahead of the front milder air continues to stream in across the local area giving us one more mild day. Enjoy the mild temperatures today because winter is about to make a comeback this week. The first signs of this change will be tonight as colder air begins to infiltrate the area behind the departing cold front.
We have a few opportunities for precipitation this week. The first chance comes on Monday as low pressure moves along the frontal boundary to our south. This system is expected to track over the open waters well south of New England but just close enough to bring a band of snow over extreme southern New England, Cape Cod and the Islands, where an inch or two of snow may accumulate over that area. Locally, we may see a few flurries in and around Boston. Just cloudy skies north and northwest of the city. If that system were to track a bit further north it would bring the snow line closer to our area but that is an outlier at this point.
High pressure builds in Monday night and Tuesday as colder air continues to overspread the area. Not the bitter cold we saw many times in January but a return to more seasonably cold temperatures.
Later Tuesday you will begin to see the first signs of another storm approaching as high clouds start to filter in overhead. Low pressure will move out of the western Gulf of Mexico and move northeastward through the Appalachians Tuesday. However, there are strong signals that the system starts to redevelop off the coast to our south with a center of low pressure situated off the Delaware coast by Wednesday morning. Snow is expected to break out Tuesday night and continue into Wednesday as the storm takes shape and strengthens offshore. This is going to be a much more formidable storm with plowable snow accumulations likely through Wednesday. There is a chance that areas in and around Boston, mainly along the coast, mix with sleet and freezing rain for a time Wednesday. This would keep accumulation down in those areas with the interior remaining all snow and seeing the highest accumulations. At least that is the way is looks now. This is still 2+ days away and the scenario can change. In any event, there will likely be interruptions to traffic and many school closings and or delays for Wednesday. The Wednesday morning commute could be very slow and trying for motorists.
There are also coastal concerns for Wednesday. We are just coming off a period of high astronomical tides and with gusty onshore winds anticipated areas along the coast need to be aware of the possibility of high tide impacts. This will be closely evaluated over the next day or so.
By Thursday the storm is gone and we dry out with colder air following in behind as we fall to below normal temperatures for Thursday and Friday.
Saturday there will be another opportunity for snow as another storm system moves toward us from the south. It is very uncertain at this point what the impacts will be.
72 Hour Outlook:
Sunday: Mostly cloudy and mild. Chance of a few scattered light afternoon showers. High temperatures in the upper 40s to 50 degrees. Light west to southwest winds turn northwest later in the day.
Sunday night: Partly to mostly cloudy and cooler. Lows in the mid 20s inland to about 30 on the coast. Light northwest winds.
Monday: Mostly cloudy. Chance of flurries in and around the immediate Boston area. Colder, highs in the low to mid 30s. Light northerly winds.
Monday night: Clearing skies and colder. Lows around 20 inland to mid 20s coast.
Tuesday: A sunny start with increasing high clouds in the afternoon. Seasonably cold, highs in the mid 30s.
Tuesday night: Becoming cloudy with snow likely developing. Lows in the mid to upper 20s.