Biting cold greets us Tuesday morning as temperatures start out in the single digits in the suburbs, low teens in and around the immediate Boston area. Those readings will represent temperatures some 20 degrees below normal for mid December. On top of that more snow is in the forecast and is due to arrive about midday, continue through the afternoon and come to and end well before midnight. Unfortunately, the heaviest period of snow is likely during the evening commute making for slippery and slow travel. The National Weather Service has a Winter Weather Advisory in effect from 9 am Tuesday until 9 pm Tuesday night.
Low pressure moves out of the Ohio Valley and then tracks just south of Long Island and the New England south coast during Tuesday. The low will then track northeastward toward Nova Scotia Wednesday. With the bitter cold air in place we are once again set up for snow. This is not looking to be a significant storm but accumulating snow will occur and a few inches is likely. Early estimates of 1 to 3 inches have been upgraded to 3 to 5 inches, possibly up to 6 inches in a few locales in Essex County. Certainly enough snow to make for headaches on the roadways and as mentioned above the timing is not good as the evening commute will be a messy one.
The good news is that once the storm moves away we will see vast improvement in our weather Wednesday and Thursday as high pressure returns. Temperatures will begin to moderate some making it much more pleasant to be outdoors.
Another system brings unsettled conditions, possibly as early as midday Friday, likely into the weekend as well. Milder temperatures will be in place by then and any precipitation we do get will be rain initially, although what type of precipitation falls later in the weekend could be of the frozen variety as temperatures begin to cool off. More on that later in the week.
72 Hour Outlook:
Tonight: Fair skies and very cold. Lows in the single digits to low teens. Diminishing northwest winds under 15 mph.
Tuesday: Skies quickly cloud over and light snow breaks out around midday, becoming steadier and heavier by mid to late afternoon. Very cold early morning temperatures will recover into the low to mid 20s in the afternoon, possibly upper 20s along the coast. Northeast winds 5 to 15 mph.
Tuesday night: Snow tapers down during the late evening hours and ends before midnight. Cold, lows in the mid teens to low 20s, interior to coast. Northwest winds 10 to 20 mph.
Wednesday: Partly cloudy, windy and cold. Highs in the low 30s, feeling more like the low 20s with the gusty northwest winds to 35 mph.
Wednesday night. Partly cloudy and continued cold. Lows in the upper teens to low 20s. West to northwest winds diminish to 10 to 20 mph with some higher gusts early at night.
Thursday: Increasing clouds, becoming mostly cloudy into the overnight. Milder, highs in the mid 30s to near 40 degrees, interior to coast. Overnight lows in the mid to upper 20s.